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Hyperkalemia is a potentially life-threatening condition frequently encountered in clinical practice, particularly among patients with chronic kidney disease, heart failure, diabetes, and hypertension and those undergoing treatment with renin-angiotensin-aldosterone system inhibitors (RAASi). The management of chronic and acute hyperkalemia is complex and requires timely intervention to prevent severe complications such as cardiac arrhythmias and sudden death. Traditional therapeutic approaches to chronic hyperkalemia, including dietary potassium restriction, use of diuretics, and administration of cation-exchange resins like sodium polystyrene sulfonate, often suffer from limitations like gastrointestinal side effects, variable efficacy, delayed onset of action, and RAASi treatment discontinuation. In recent years, the development of new potassium binders, specifically patiromer and sodium zirconium cyclosilicate (SZC), has revolutionized the management of hyperkalemia. Patiromer, a non-absorbed polymer, binds potassium in the gastrointestinal tract in exchange for calcium, thus facilitating its excretion. SZC operates by exchanging sodium and hydrogen ions for potassium, leading to efficient potassium removal. Both agents have demonstrated rapid and sustained reductions in serum potassium levels, coupled with favorable safety and tolerability profiles, in multiple clinical trials. This review article, authored by a multidisciplinary group of Portuguese experts in hyperkalemia management, provides an in-depth analysis of the efficacy and safety of current therapeutic strategies and highlights the clinical potential of new potassium binders. The introduction of patiromer and SZC offers significant advantages over traditional therapies, providing effective and better-tolerated options for patients. The review highlights the role of these novel agents in contemporary hyperkalemia management and calls for ongoing research to further refine treatment protocols and improve patient outcomes., Competing Interests: Declarations. Ethics approval: Not applicable. Consent for publication: All the authors have read and approved the final version of the manuscript and gave their consent for publication. Competing interests: C.F received consultancy fees, lectures, or sponsorship of scientific meetings from AstraZeneca, Bayer, Bial, Boehringer Ingelheim, Novartis, Novo Nordisk, Pfizer, Roche Diagnosis, Servier, CSL Vifor, companies that research and commercialize drugs for the treatment of heart failure patients. G.C. received speaking fees from Servier, Novartis, CSL Vifor, and Boehringer. C.G. is employed by Fresenius Medical Care as Head of the Nutrition Department. G.S. received speaking fees from CSL Vifor, AstraZeneca, Alnylam and Baxter. I.M. received speaking fees from AstraZeneca, Bayer, Bial, CSL Vifor, Daiichi-Sankyo, Novartis, Pfizer, Roche Diagnostics, and Servier. I.M. served on advisory boards for AstraZeneca, Bayer, Bial, CSL Vifor, Novartis, Novo Nordisk, and Servier. A.F. received Advisory Board and consultancy fees, lectures, or sponsorship of scientific meetings from AstraZeneca, Astellas, CSL Vifor, Fresenius Medical Care, MSD-Merck Sharp & Dohme companies., (© 2024. The Author(s).)

Renin-angiotensin-aldosterone system inhibitors (RAASi) and mineralocorticoid receptor antagonists (MRAs) are key drugs in the management of patients with cardiovascular diseases (CVD), particularly those with hypertension, diabetes, chronic kidney disease and heart failure (HF), given their demonstrated effectiveness in reducing the risk of both surrogate and hard endpoints. Despite their positive impact on the outcome, patients with RAASi and MRAs are particularly vulnerable to hyperkalaemia, with approximately 50 % of these individuals experiencing two or more recurrences annually. The common practice of reducing the dose or discontinuing the treatment with RAASi and MRAs in conditions of hyperkalaemia results in suboptimal management of these patients, with a potential impact on their mortality and morbidity risk. Recent guidelines from cardiovascular and renal international societies increasingly recognize the need for alternative strategies to manage the risk of hyperkalaemia, allowing the continuation of RAASi and MRA therapies. In this review, we summarise the new potential options available to manage hyperkalaemia in patients with CVD and the recommendations of the most recent guidelines on the topic., (Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)

We present a case of hyperkaliaemic cardiac arrest in a patient with Angelman's syndrome after administration of suxamethonium in rapid sequence intubation. The patient was admitted to the critical care unit in with aspiration pneumonia and intestinal obstruction. They had a cardiac arrest after suxamethonium administration. Potassium level was remarkably high (11.1 mmol/L). ROSC was achieved after 26 min of CPR and resuscitation. We discuss Angelman's syndrome molecular pathology, especially affecting the potassium channels transmission and its relation to suxamethonium in emergency intubation., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2024. No commercial re-use. See rights and permissions. Published by BMJ Group.)

Background: For heart failure with reduced ejection fraction (HFrEF), suboptimal use of renin-angiotensin-aldosterone system inhibitors (RAASis), including mineralocorticoid receptor antagonists (MRAs), due to hyperkalemia, may be improved by potassium binders., Objectives: This prespecified analysis of the phase 3 DIAMOND (Patiromer for the Management of Hyperkalemia in Subjects Receiving RAASi Medications for the Treatment of Heart Failure) trial assessed the effect of patiromer in patients with HFrEF and either current or past hyperkalemia., Methods: Patients with HFrEF and current or past (within 1 year before enrollment) hyperkalemia (serum potassium [sK + ] >5.0 mmol/L) entered a single-blind, run-in phase to optimize RAASis while receiving patiromer. They were subsequently randomized, double-blind, to continue patiromer or change to placebo., Results: Of the 1,038 patients who completed run-in, 354 (83.9%) of 422 with current hyperkalemia and 524 (85.1%) of 616 with past hyperkalemia achieved RAASi optimization and were randomized to treatment. During the double-blind phase, patiromer lowered sK + levels compared with placebo in both the current and past hyperkalemia subgroups: difference in adjusted mean change from baseline: -0.12 (95% CI: -0.17 to -0.07) and -0.08 (95% CI: -0.12 to -0.05), respectively; P interaction  = 0.166. Patiromer was more effective than placebo in maintaining MRA at target dose in patients with current vs past hyperkalemia (HR: 0.45 [95% CI: 0.26-0.76] vs HR: 0.85 [95% CI: 0.54-1.32]; P interaction  = 0.031). Adverse events were similar between subgroups., Conclusions: The use of patiromer facilitates achieving target doses of RAASis in patients with HFrEF with either current or past hyperkalemia. For those with current hyperkalemia before RAASi optimization, use of patiromer may be more beneficial in helping to maintain sK + control and achieve MRA target dose. (Patiromer for the Management of Hyperkalemia in Subjects Receiving RAASi Medications for the Treatment of Heart Failure [DIAMOND]; NCT03888066)., Competing Interests: Funding Support and Author Disclosures This trial was funded by Vifor Pharma Management Ltd. Dr Coats has received consulting fees from Actimed, Cardiac Dimensions, Corvia, CVRx, Enopace, ESN Cleer, Faraday, Impulse Dynamics, and Respicardia; has received payment or honoraria from Abbott, AstraZeneca, Bayer, Boehringer Ingelheim, Edwards, Eli Lilly, Menarini, Novartis, Servier, Vifor, and Viatris; and has participated on a data safety monitoring board or advisory board from Impulse Dynamics. Dr Anker has received grants and personal fees from Vifor and Abbott Vascular; has received personal fees for consultancies, trial committee work, and/or lectures from Actimed, AstraZeneca, Bayer, Bioventrix, Boehringer Ingelheim, Brahms, Cardiac Dimensions, Cardior, Cordio, CVRx, Cytokinetics, Edwards, Farraday Pharmaceuticals, GlaxoSmithKline, HeartKinetics, Impulse Dynamics, Medtronic, Novartis, Novo Nordisk, Occlutech, Pfizer, Regeneron, Relaxera, Repairon, Scirent, Sensible Medical, Servier, Vectorious, and V-Wave; and is named coinventor of 2 patent applications regarding Midregional pro-atrial natriuretic peptide (DE 102007010834 and DE 102007022367) but does not benefit personally from the related issued patents. Dr Lund has received grants or contracts from AstraZeneca, Boehringer Ingelheim, Boston Scientific, Novartis, and Vifor Pharma; has received consulting fees from AstraZeneca, Bayer, Boehringer Ingelheim, Lexicon, Medscope, Merck, Pharmacosmos, MyoKardia, Sanofi, Servier, and Vifor Pharma; has received payment or honoraria from Abbott, AstraZeneca, Medscope, Novartis, and Radcliffe; is a board member/fellow of the European Society of Cardiology Heart Failure Association, the European Society of Cardiology, and the Swedish Society of Cardiology HF Working Group; and has stock or stock options in AnaCardio. Dr Filippatos reports being a committee member in trials for the European Commission; has received payment or honoraria from Bayer and Boehringer Ingelheim; reports participation on a data safety monitoring board or advisory board from Bayer; reports leadership or fiduciary role from European Academy, Heart Failure Association, and JACC: Heart Failure; and reports lecture fees and advisory or committee membership in trials from Amgen, Bayer, Boehringer Ingelheim, Cardior, Impulse Dynamics, Medtronic, Novartis, Servier, and Vifor. Dr Rossignol reports being a DIAMOND Steering Committee member; has received honoraria from Vifor; has received personal fees from AstraZeneca, Bayer, Boehringer Ingelheim, CinCor, Idorsia, KBP Biosciences, Novo Nordisk, Sanofi, Servier, and Vifor; has received support for attending meetings and/or travel from AstraZeneca, Bayer, Boehringer Ingelheim, and Vifor; is a cofounder of CardioRenal; has participated on a data safety monitoring board or advisory board from Bayer, Idorsia, and Sequana Medical; and has stock from Cardiorenal and stock options from G3P. Dr Pitt has received consulting fees, payment or honoraria, support for attending meetings and/or travel, and stock or stock option from Vifor. Dr Weir reports serving on the DIAMOND Steering Committee; and has received personal fees from CSL Vifor, AstraZeneca, Novo Nordisk, Johnson & Johnson, and Care DX. Dr Kosiborod has received research grants from AstraZeneca, Boehringer Ingelheim, and Pfizer; reports consultancy/advisory board activities for 35Pharma, Alnylam, Amgen, Applied Therapeutics, AstraZeneca, Bayer, Boehringer Ingelheim, Cytokinetics, Dexcom, Eli Lilly, Esperion Therapeutics, Imbria, Janssen, Lexicon Pharmaceuticals, Merck (Diabetes and Cardiovascular), Novo Nordisk, Pharmacosmos, Pfizer, Sanofi, scPharmaceuticals, Structure Therapeutics, Vifor Pharma, and Youngene Therapeutics; has received other research support from AstraZeneca; has received honoraria from AstraZeneca, Boehringer Ingelheim, and Novo Nordisk; has received support for attending meetings and/or travel from Amgen, AstraZeneca, Bayer, Boehringer Ingelheim, Novo Nordisk, and Vifor Pharma; and reports stock options from Artera Health, and Saghmos Therapeutics. Dr Metra has received honoraria for participation on a DIAMOND trial meeting. Dr Böhm has received research support from Deutsche Forschungsgemeinschaft (DFG, SFB-TTR 219, S-01); has received honoraria for speaking from Abbott, Amgen, AstraZeneca, Bayer, Boehringer Ingelheim, Bristol Myers Squibb, Cytokinetics, Medtronic, Novartis, Servier, and Vifor; and has participated in advisory boards for Amgen, Bayer, Boehringer Ingelheim, Cytokinetics, Medtronic, Novartis, Pfizer, ReCor, Servier, and Vifor. Dr Ezekowitz has received research support for trial leadership or grants from American Regent, Applied Therapeutics, AstraZeneca, Bayer, Cytokinetics, Merck and Co, Novo Nordisk, and Otsuka; and honoraria for consultancy from AstraZeneca, Bayer, Boehringer Ingelheim, Novartis, Novo Nordisk, and Otsuka. Dr Bayes-Genis has received consulting and/or lecturing fees from Abbott, AstraZeneca, Bayer, Boehringer Ingelheim, Novartis, Roche Diagnostics, and Vifor. Dr Mentz has received honoraria from Vifor and research support and honoraria from AstraZeneca. Dr Ponikowski has received grants or contracts, consulting fees, and payment or honoraria from Abbott Vascular, Amgen, AstraZeneca, Bayer, Berlin Chemie, Boehringer Ingelheim, Cibiem, Bristol Myers Squibb, Impulse Dynamics, Merck, Renal Guard Solution, Novartis, Servier, and Vifor. Dr Senni reports consultancy with Novartis, Merck, Bayer, Vifor Pharma, Abbott, Boehringer Ingelheim, AstraZeneca, BioVentrix, Servier, Novo Nordisk, Cardurion Pharmaceuticals, and AnaCardio. Dr Cleland has received personal fees from Abbott, Amgen, AstraZeneca, Idorsia, Innolife, Medtronic, Novartis, Respicardia, Servier and Torrent, and grants and personal fees from Bayer, Bristol Myers Squibb, Cytokinetics, Johnson & Johnson, MyoKardia, Pharmacosmos, Stealth Biopharmaceuticals, Vifor, and VisCardia; and personal fees and nonfinancial support from Boehringer Ingelheim outside the submitted work. Dr Merkely has received personal fees from Abbott, AstraZeneca, Biotronik, Boehringer Ingelheim, CSL Behring, Daiichi Sankyo, DUKE Clinical Institute, Medtronic, Novartis, and institutional grants from Abbott, AstraZeneca, Biotronik, Boehringer Ingelheim, Boston Scientific, Bristol Myers Squibb, CSL Behring, Daiichi Sankyo, DUKE Clinical Institute, Eli Lilly, Medtronic, Novartis, Terumo, and Vifor Pharma. Dr Wächter, Mr Budden, and Dr Perrin report being paid employees and having stock/stock options in CSL Vifor. Dr Butler has received personal consulting fees from Abbott, American Regent, Amgen, Applied Therapeutic, AstraZeneca, Bayer, Boehringer Ingelheim, Bristol Myers Squibb, Cardiac Dimension, Cardior, CVRx, Cytokinetics, Edwards, Element Science, Innolife, Impulse Dynamics, Imbria, Inventiva Pharma, Lexicon, Lilly, LivaNova, Janssen, Medtronic, Merck, Occlutech, Novartis, Novo Nordisk, Pfizer, Pharmacosmos, PharmaIN, Roche, Sequana, SQ Innovation, 3live, and Vifor; and payment from AstraZeneca, Boehringer Ingelheim-Lilly, Janssen, and Novartis. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)

Spironolactone, a steroidal mineralocorticoid receptor antagonist (MRA), has been used to treat patients with heart failure (HF) for more than half a century. Spironolactone improved outcomes in patients with severely symptomatic HF with reduced ejection fraction, and later, eplerenone expanded the benefits to patients with mildly symptomatic HF with reduced ejection fraction and myocardial infarction complicated by HF. Spironolactone reduced HF events in some patients with HF with preserved ejection fraction, but the results were not generalizable to all patients with HF with preserved ejection fraction. More recently, the nonsteroidal MRA finerenone improved the HF outcomes of patients with HF with preserved ejection fraction, expanding the benefits previously seen among patients with diabetes and albuminuric chronic kidney disease. The use of MRAs has been limited due to excessive concern about hyperkalemia. Education about the limited true risk associated with hyperkalemia, and about how to predict, prevent, and manage hyperkalemia, may lead to wider acceptability and use of these agents. Several ongoing trials are testing steroidal and nonsteroidal MRAs in HF populations. In this review, we perform a critical appraisal of MRA use in HF populations and point toward future directions., Competing Interests: Dr Ferreira reports research collaborations with Bayer, Boehringer Ingelheim, Novartis, AstraZeneca, and Salamandra, outside the submitted work. Dr Pitt reports being a consultant for Bayer, AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Lexicon, Sea Star Medical, CEVA Animal Health, ANA Cardio, Corteria Therapeutics, SC Pharmaceuticals, SQinnovations, G3 Pharmaceuticals, Vifor (Relypsa), KBP Biosciences, Sarfez, Cereno Scientific, Proton Intel, and Brainstorm Medical (stock options, stock); US patent 9931412, Site-Specific Delivery of Eplerenone to the Myocardium; US patent pending 63/045783, Histone Modulating Agents for the Prevention and Treatment of Organ Injury; and Data Safety Monitoring Board of Millennial Pharmaceutics (Lorundrostat). Dr Zannad reports personal fees from Bayer, Janssen, Novartis, Boston Scientific, Amgen, CVRx, and Boehringer Ingelheim and other income from CardioRenal, AstraZeneca, Vifor Fresenius, Cardior, Cereno Pharmaceuticals, Applied Therapeutics, Merck, and CVCT, outside the submitted work.

Purpose: To evaluate the efficacy and safety of patiromer, a novel potassium binder, in reducing the risk of hyperkalemia in patients with heart failure and optimizing their RAASi therapy., Design: Systematic review and meta-analyses., Method: The authors conducted a systematic search in Pubmed, Embase, Web of Science, and Cochrane Library for randomized controlled trials investigating the efficacy and safety of patiromer in heart failure patients from inception to 31 January 2023 and updated on 25 March 2023. The primary outcome was the association between the reduction of hyperkalemia and patiromer compared with placebo, and the secondary outcome was the association between optimization of RAASi therapy and patiromer., Results: A total of four randomized controlled trials (n = 1163) were included in the study. Patiromer was able to reduce the risk of hyperkalemia in heart failure patients by 44% (RR 0.56, 95% CI 0.36 to 0.87; I 2 = 61.9%), improve tolerance to target doses of MRA in patients with heart failure (RR 1.15, 95% CI 1.02 to 1.30; I 2 = 49.4%), and decrease the proportion of all-cause discontinuation of RAASi (RR 0.49, 95% CI 0.25 to 0.98; I 2 = 48.4%). However, patiromer therapy was associated with an increased risk of hypokalemia (RR 1.51, 95% CI 1.07 to 2.12; I 2 = 0%), while no other statistically significant adverse events were observed., Conclusion: Patiromer appears to have a considerable effect on reducing the incidence of hyperkalemia in heart failure patients and on optimizing the therapy of RAASi in those patients., Competing Interests: Declarations. Ethical Approval: This article does not contain any studies with human participants or animals performed by any of the authors. Consent for Participation: Not required. Consent for Publication: All authors have read and approved the submission of the manuscript; the manuscript has not been published and is not being considered for publication elsewhere, in whole or in part, in any language. Competing Interests: The authors have no relevant financial or non-financial interests to disclose., (© 2023. The Author(s).)

Two potassium (K + ) binders-patiromer sorbitex calcium and sodium zirconium cyclosilicate-are recommended by international guidelines for the management of hyperkalemia. There is, however, no universally accepted best practice for how to appropriately utilize K + binders in the long-term clinical management of CKD. A panel of eight US-based nephrologists convened in October 2022 to develop a consensus statement regarding utilizing K + binders in clinical practice to help manage patients with nonemergent, persistent/recurrent hyperkalemia in CKD. Consensus was reached on the following topics: (1) identifying risk factors for hyperkalemia; (2) serum K + monitoring before and during K + binder use; (3) utilizing K + binders in patients receiving renin-angiotensin-aldosterone system inhibitors and dialysis; and (4) when to initiate K + binders and their duration of use. These consensus statements for the use of K + binders may assist the nephrology community in optimizing management of hyperkalemia in patients across the spectrum of CKD., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)

Background: Hyperkalemia is a common complication of chronic kidney disease (CKD). This study aims to investigate the efficacy and safety of sodium zirconium cyclosilicate and calcium polystyrene sulfonate in reducing potassium in patients with acute and severe hyperkalemia in CKD who are not undergoing dialysis., Materials and Methods: A retrospective real-world study was conducted among 73 patients with non-dialysis chronic kidney disease who were hospitalized in the First Affiliated Hospital of Chengdu Medical College from June 2020 to June 2022. 33 patients treated with sodium zirconium cyclosilicate were categorized as SZC group, and the other 40 patients treated with calcium polystyrene sulfonate were categorized as CPS group. Serum potassium, serum sodium, magnesium, calcium, and phosphorus levels were examined. Adverse reactions were recorded during medication., Results: Significantly decreased serum potassium was observed in both groups, whereas the potassium reduction was higher in the SZC group than in the CPS group at 2, 4, 24, and 48 hours after medication while there was no statistically significant difference in the serum potassium level between the two groups at 72 hours. For those people whose initial potassium exceeded 6 mmol/L, the potassium reduction was more obvious in the SZC group than in the CPS group at 2 and 4 hours after medication. The control rate of hyperkalemia in the SZC group was significantly higher than in the CPS group at 4, 24, and 48 hours. No distinct change was observed in serum sodium, calcium, magnesium, and phosphorus before and 72 hours after medication. No severe adverse reactions occurred., Conclusion: Sodium zirconium cyclosilicate has a more obvious effect on reducing potassium particularly for those patients with moderate to severe hyperkalemia who need rapid potassium reduction.

Background: The conventional dose of 10 units of intravenous (IV) regular insulin to treat hyperkalemia has been associated with hypoglycemia. There have been retrospective studies evaluating weight-based dose vs conventional dose of IV regular insulin but the comparative efficacy and safety is not well established. Objective : Evaluate the difference in weight-based dosing of IV regular insulin between patients who experienced hypoglycemia vs. patients who did not experience hypoglycemia after the administration of IV regular insulin. Methods: This was a retrospective, electronic chart review at a single academic medical center which included patients ≥18 years of age with an emergency department or inpatient encounter who were administered IV regular insulin within 6 hours of a pre-treatment potassium of ≥5 mmol/L. Results: There was no significant difference in the weight-based insulin dose between patients who experienced a hypoglycemic event and patients who did not experience a hypoglycemic event (.14 vs .22 units/kg; P = .44). The potassium-lowering effect was similar between the two groups (1.02 vs .96 mmol/L; P = .56). A regression analysis revealed that female sex, low baseline blood glucose (glucose <140 mg/dL), and those who received a repeat dose of IV regular insulin were independent risk factors for development of hypoglycemia. Conclusion: This study found no difference in hypoglycemic events and potassium lowering based on IV weight-based regular insulin dosing, however other risk factors may predict hypoglycemia., Competing Interests: Declaration of Conflicting InterestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Background: Mineralocorticoid receptor antagonists (MRAs) improve outcomes in patients with heart failure and reduced ejection fraction (HFrEF). However, MRAs are often underused because of hyperkalemia concerns., Objectives: The purpose of this study was to assess whether sodium zirconium cyclosilicate (SZC), a nonabsorbed crystal that traps and rapidly lowers potassium, enables MRA use in patients with HFrEF and prevalent hyperkalemia (or at high risk)., Methods: REALIZE-K is a prospective, double-blind, placebo-controlled trial in patients with HFrEF (NYHA functional class II-IV; left ventricular ejection fraction ≤40%), optimal therapy (except MRA), and prevalent hyperkalemia (or at high risk). During the open-label run-in, all participants underwent protocol-mandated spironolactone titration (target: 50 mg daily); those with prevalent (cohort 1) or incident (cohort 2) hyperkalemia during titration started SZC. Participants achieving normokalemia while on spironolactone ≥25 mg daily were randomized to continuing SZC or matching placebo for 6 months. The primary composite endpoint was proportion of participants with optimal response (normokalemia, on spironolactone ≥25 mg daily, no rescue for hyperkalemia [months 1-6])., Results: Of 365 patients (run-in), 202 were randomized. Baseline characteristics included mean age 70 years, prevalent comorbidities (78% estimated glomerular filtration rate <60 mL/min/1.73 m 2 , 38% atrial fibrillation/flutter), high N-terminal pro B-type natriuretic peptide (median 1,136 pg/mL), and high HFrEF therapy use (64% sacubitril/valsartan, 96% beta-blocker, 42% sodium glucose co-transporter 2 inhibitor). At randomization, 78% were receiving spironolactone 50 mg daily., Conclusions: REALIZE-K is the first trial to evaluate whether SZC can enable rapid and safe MRA optimization and long-term continuation in patients with HFrEF and prevalent/high risk of hyperkalemia. (Study to Assess Efficacy and Safety of SZC for the Management of High Potassium in Patients with Symptomatic HFrEF Receiving Spironolactone [REALIZE-K]; NCT04676646)., Competing Interests: Funding Support and Author Disclosures The REALIZE-K trial was funded by AstraZeneca. Drs Kosiborod, Cherney, Connelly, Desai, Guimarães, Kuthi, Lala, Madrini, Merkely, Villota, Squire, Testani, Vaclavik, Verma, Wranicz, and Petrie have received research funding in the form of grants to institutions from AstraZeneca and/or consulting for AstraZeneca. Mr Dahl, Mr Eudicone, and Ms Friberg are employees of, and hold or may hold stock in, AstraZeneca., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)

Background: Hyperkalemia (HK) is associated with suboptimal renin-angiotensin system (RAS) inhibitor and mineralocorticoid receptor antagonist (MRA) use in heart failure with reduced ejection fraction (HFrEF)., Objectives: This study sought to assess characteristics and RAS inhibitor/MRA use in patients receiving patiromer during the DIAMOND (Patiromer for the Management of Hyperkalemia in Subjects Receiving RAASi Medications for the Treatment of Heart Failure) run-in phase., Methods: Patients with HFrEF and HK or past HK entered a run-in phase of ≤12 weeks with patiromer-facilitated RAS inhibitor/MRA optimization to achieve ≥50% recommended RAS inhibitor dose, 50 mg/d MRA, and normokalemia. Patients achieving these criteria (randomized group) were compared with the run-in failure group (patients not meeting the randomization criteria)., Results: Of 1,038 patients completing the run-in, 878 (84.6%) were randomized and 160 (15.4%) were run-in failures. Overall, 422 (40.7%) had HK entering run-in with a similar frequency in the randomized and run-in failure groups (40.3% vs 42.5%; P = 0.605). From start to the end of run-in, in the randomized group, an increase was observed in target RAS inhibitor and MRA use in patients with HK (RAS inhibitor: 76.8% to 98.6%; MRA: 35.9% to 98.6%) and past HK (RAS inhibitor: 60.5% to 98.1%; MRA: 15.6% to 98.7%). Despite not meeting the randomization criteria, an increase after run-in was observed in the run-in failure group in target RAS inhibitor (52.5% to 70.6%) and MRA use (15.0% to 48.1%). This increase was observed in patients with HK (RAS inhibitor: 51.5% to 64.7%; MRA: 19.1% to 39.7%) and past HK (RAS inhibitor: 53.3% to 75.0%; MRA: 12.0% to 54.3%)., Conclusions: In patients with HFrEF and HK or past HK receiving suboptimal RAS inhibitor/MRA therapy, RAS inhibitor/MRA optimization increased during patiromer-facilitated run-in., Competing Interests: Funding Support and Author Disclosures Study funding was provided by Vifor (International) AG. Dr Pitt has received consulting fees, payment or honoraria, support for attending meetings and/or travel, and stock or stock option from Vifor. Dr Anker has recevied grants from Abbott Vascular and Vifor; has received ad hoc consultancy/advisory board participation from Amgen, AstraZeneca, Bioventrix, Brahms, Cordio, CVRx, Edwards, Novartis, Novo Nordisk, Reparion, Sanofi, and Vectorious; has performed trial/registry steering committee work or consulting for Bayer AG, Boehringer Ingelheim, Cardiac Dimensions, Cardior, Impulse Dynamics, Occlutech, Servier, V-Wave, and Vifor Int; and has received fees for advisory board work from Abbott Vascular. Dr Lund has received grants or contracts from AstraZeneca, Boehringer Ingelheim, Boston Scientific, Novartis, and Vifor Pharma; has received consulting fees from AstraZeneca, Bayer, Boehringer Ingelheim, Lexicon, MedScope, Merck, Pharmacosmos, Myokardia, Sanofi, Servier, and Vifor Pharma; has received payment or honoraria from Abbott, AstraZeneca, Medscope, Novartis, and Radcliffe; and has been a board member/fellow of ESC Heart Failure Association (HFA), ESC, and Swedish Society of Cardiology, HF Working Group; and has stock or stock options in AnaCardio. Dr Coats has received consulting fees from Actimed, Cardiac Dimensions, Corvia, CVRx, Enopace, ESN Cleer, Faraday, Impulse Dynamics, and Respicardia; has received payment or honoraria from Abbott, AstraZeneca, Bayer, Boehringer Ingelheim, Edwards, Eli Lilly, Menarini, Novartis, Servier, Vifor, and Viatris; and has participated on a data safety monitoring board or advisory board from Impulse Dynamics. Dr Filippatos has been a committee member in trials for the European Commission; has received payment or honoraria from Bayer and Boehringer Ingelheim; has participated on a data safety monitoring board or advisory board from Bayer; has a leadership or fiduciary role from European Academy, Heart Failure Association, and JACC Heart Failure; and has received lecture fees, advisory or committee membership in trials from Amgen, Bayer, Boehringer Ingelheim, Cardior, Impulse Dynamics, Medtronic, Novartis, Servier, and Vifor. Dr Rossignol has been a DIAMOND Steering Committee member and has received honoraria from Vifor; has received personal fees from AstraZeneca, Bayer, Boehringer Ingelheim, CinCor, Idorsia, KBP, Novo Nordisk, Sanofi, Servier, and Vifor; has received support for attending meetings and/or travel from AstraZeneca, Bayer, Boehringer Ingelheim, and Vifor; is cofounder of CardioRenal; has participated on a data safety monitoring board or advisory board from Bayer, Idorsia, and Sequana medical; and has stock in Cardiorenal and stock options in G3P. Dr Weir has served on the DIAMOND Steering Committee and has received personal fees from CSL Vifor, AstraZeneca, Novo Nordisk, Johnson & Johnson, and Care DX. Dr Kosiborod has received research grants from AstraZeneca, Boehringer Ingelheim, and Pfizer; has served as a consultant/advisory board member for 35Pharma, Alnylam, Amgen, Applied Therapeutics, AstraZeneca, Bayer, Boehringer Ingelheim, Cytokinetics, Dexcom, Eli Lilly, Esperion Therapeutics, Imbria Pharmaceuticals, Janssen, Lexicon Pharmaceuticals, Merck (Diabetes and Cardiovascular), Novo Nordisk, Pharmacosmos, Pfizer, Sanofi, scPharmaceuticals, Structure Therapeutics, Vifor Pharma, and Youngene Therapeutics; has received research support from AstraZeneca; has received honoraria from AstraZeneca, Boehringer Ingelheim, and Novo Nordisk; has received support for attending meetings and/or travel from Amgen, AstraZeneca, Bayer, Boehringer Ingelheim, Novo Nordisk, and Vifor Pharma; and has stock options in Artera Health and Saghmos Therapeutics. Dr Metra has received honoraria for participation on a DIAMOND trial meeting. Dr Böhm has received research support from Deutsche Forschungsgemeinschaft (DFG, SFB-TTR 219, S-01); has received honoraria for speaking from Abbott, Amgen, AstraZeneca, Bayer, Boehringer Ingelheim, Bristol Myers Squibb, Cytokinetics, Medtronic, Novartis, Servier, and Vifor; and has particiapted in advisory boards for Amgen, Bayer, Boehringer Ingelheim, Cytokinetics, Medtronic, Novartis, Pfizer, ReCor, Servier, and Vifor. Dr Ezekowitz has received research support for trial leadership or grants from American Regent, Applied Therapeutics, AstraZeneca, Bayer, Cytokinetics, Merck & Co, Novo Nordisk, and Otsuka; and has received honoraria for consultancy from AstraZeneca, Bayer, Boehringer Ingelheim, Novartis, Novo Nordisk, and Otsuka. Dr Bayes-Genis has lectured and/or participated in boards for Abbott, AstraZeneca, Boehringer Ingelheim, Bayer, Novartis, Roche Diagnostics, and Vifor. Dr Mentz has received honoraria from Vifor; and has received research support and honoraria from AstraZeneca. Dr Ponikowski has received grants or contracts, consulting fees, and payment or honoraria from Abbott Vascular, Amgen, AstraZeneca, Bayer, Berlin Chemie, Boehringer Ingelheim, Cibiem, BMS, Impulse Dynamics, Merck, Renal Guard Solution, Novartis, Servier, and Vifor. Dr Senni has been a consultant for Novartis, Merck, Bayer, Vifor Pharma, Abbott, Boehringer Ingelheim, AstraZeneca, Bioventrix, Servier, Novo Nordisk, Cardurion, and AnaCardio. Dr Brugts has received an independent research grant from Abbott to the Institute; and has received honoraria for advisory boards or speaker fees from Abbott, AstraZeneca, Bayer, Boehringer Ingelheim, Novartis, and Vifor (5-year period). Drs Perrin, Waechter, and Budden have been paid employees and have stock/stock options in CSL Vifor. Dr Butler has received personal consulting fees from Abbott, American Regent, Amgen, Applied Therapeutic, AstraZeneca, Bayer, Boehringer Ingelheim, Bristol Myers Squibb, Cardiac Dimension, Cardior, CVRx, Cytokinetics, Edwards, Element Science, Innolife, Impulse Dynamics, Imbria, Inventiva, Lexicon, Lilly, LivaNova, Janssen, Medtronics, Merck, Occlutech, Novartis, Novo Nordisk, Pfizer, Pharmacosmos, Pharmain, Roche, Sequana, SQ Innovation, 3live, and Vifor; and has received payment from AstraZeneca, Boehringer Ingelheim-Lilly, Janssen, and Novartis. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)

Objectives: Hyperkalemia is a common life-threatening condition causing severe electrophysiologic derangements and arrhythmias. The beneficial effects of calcium (Ca 2+ ) treatment for hyperkalemia have been attributed to "membrane stabilization," by restoration of resting membrane potential (RMP). However, the underlying mechanisms remain poorly understood. Our objective was to investigate the mechanisms underlying adverse electrophysiologic effects of hyperkalemia and the therapeutic effects of Ca 2+ treatment., Design: Controlled experimental trial., Setting: Laboratory investigation., Subjects: Canine myocytes and tissue preparations., Interventions and Measurements: Optical action potentials and volume averaged electrocardiograms were recorded from the transmural wall of ventricular wedge preparations ( n = 7) at baseline (4 mM potassium), hyperkalemia (8-12 mM), and hyperkalemia + Ca 2+ (3.6 mM). Isolated myocytes were studied during hyperkalemia (8 mM) and after Ca 2+ treatment (6 mM) to determine cellular RMP., Main Results: Hyperkalemia markedly slowed conduction velocity (CV, by 67% ± 7%; p < 0.001) and homogeneously shortened action potential duration (APD, by 20% ± 10%; p < 0.002). In all preparations, this resulted in QRS widening and the "sine wave" pattern observed in severe hyperkalemia. Ca 2+ treatment restored CV (increase by 44% ± 18%; p < 0.02), resulting in narrowing of the QRS and normalization of the electrocardiogram, but did not restore APD. RMP was significantly elevated by hyperkalemia; however, it was not restored with Ca 2+ treatment suggesting a mechanism unrelated to "membrane stabilization." In addition, the effect of Ca 2+ was attenuated during L-type Ca 2+ channel blockade, suggesting a mechanism related to Ca 2+ -dependent (rather than normally sodium-dependent) conduction., Conclusions: These data suggest that Ca 2+ treatment for hyperkalemia restores conduction through Ca 2+ -dependent propagation, rather than restoration of membrane potential or "membrane stabilization." Our findings provide a mechanistic rationale for Ca 2+ treatment when hyperkalemia produces abnormalities of conduction (i.e., QRS prolongation)., Competing Interests: Drs. Piktel, Laurita, and Wilson received support for article research from the National Institutes of Health. The remaining authors have disclosed that they do not have any potential conflicts of interest., (Copyright © 2024 by the Society of Critical Care Medicine and Wolters Kluwer Health, Inc. All Rights Reserved.)

Objectives: Hyperkalemia is a common life-threatening condition causing severe electrophysiologic derangements and arrhythmias. The beneficial effects of calcium (Ca 2+ ) treatment for hyperkalemia have been attributed to "membrane stabilization," by restoration of resting membrane potential (RMP). However, the underlying mechanisms remain poorly understood. Our objective was to investigate the mechanisms underlying adverse electrophysiologic effects of hyperkalemia and the therapeutic effects of Ca 2+ treatment., Design: Controlled experimental trial., Setting: Laboratory investigation., Subjects: Canine myocytes and tissue preparations., Interventions and Measurements: Optical action potentials and volume averaged electrocardiograms were recorded from the transmural wall of ventricular wedge preparations ( n = 7) at baseline (4 mM potassium), hyperkalemia (8-12 mM), and hyperkalemia + Ca 2+ (3.6 mM). Isolated myocytes were studied during hyperkalemia (8 mM) and after Ca 2+ treatment (6 mM) to determine cellular RMP., Main Results: Hyperkalemia markedly slowed conduction velocity (CV, by 67% ± 7%; p < 0.001) and homogeneously shortened action potential duration (APD, by 20% ± 10%; p < 0.002). In all preparations, this resulted in QRS widening and the "sine wave" pattern observed in severe hyperkalemia. Ca 2+ treatment restored CV (increase by 44% ± 18%; p < 0.02), resulting in narrowing of the QRS and normalization of the electrocardiogram, but did not restore APD. RMP was significantly elevated by hyperkalemia; however, it was not restored with Ca 2+ treatment suggesting a mechanism unrelated to "membrane stabilization." In addition, the effect of Ca 2+ was attenuated during L-type Ca 2+ channel blockade, suggesting a mechanism related to Ca 2+ -dependent (rather than normally sodium-dependent) conduction., Conclusions: These data suggest that Ca 2+ treatment for hyperkalemia restores conduction through Ca 2+ -dependent propagation, rather than restoration of membrane potential or "membrane stabilization." Our findings provide a mechanistic rationale for Ca 2+ treatment when hyperkalemia produces abnormalities of conduction (i.e., QRS prolongation)., Competing Interests: Drs. Piktel, Laurita, and Wilson received support for article research from the National Institutes of Health. The remaining authors have disclosed that they do not have any potential conflicts of interest., (Copyright © 2024 by the Society of Critical Care Medicine and Wolters Kluwer Health, Inc. All Rights Reserved.)

Background: Current protocols which include the administration of a single dextrose dose concomitantly with insulin are inadequate as hypoglycemia commonly occurs 60 min after insulin administration and may persist for up to two hours post-insulin administration. To prevent delayed hypoglycemic events, our institution revised our adult acute hyperkalemia order set to include hypoglycemic preventative measures not currently described in the literature., Methods: The primary purpose of this retrospective study was to determine if the new adult acute hyperkalemia order set resulted in lower rates of hypoglycemia (glucose <70 mg/dL) compared to the old order set in patients with impaired renal clearance and lower pre-insulin glucose values. In addition to reducing the IV regular insulin dose from 10 to 5 units, the new order set recommends patients receive a 250 mL dextrose 10% solution over two hours in addition to a 50 mL dextrose 50% IV push concomitantly with IV regular insulin if their pre-insulin glucose is ≤250 mg/dL. Patients were included if they were adults, received IV regular insulin from the order set within six hours of presenting to the ED, had a pre-insulin potassium >5.5 mmol/L, had a pre-insulin glucose ≤250 mg/dL, and had impaired renal clearance [creatinine clearance (CrCl) < 30 mL/min or dialysis dependent]., Results: 100 patients were included in each arm. The median pre-insulin potassium levels were 6.4 mmol/L and 6.3 mmol/L in the old and new groups, respectively (p = 0.133). The median pre-insulin glucose levels were 120 mg/dL and 107.5 mg/dL in the old and new groups, respectively (p = 0.013). Twenty (20%) patients in the old group developed hypoglycemia, whereas six (6%) patients in the new group developed hypoglycemia (p = 0.003). There was no significant difference between the two groups in number of patients who achieved a post-insulin potassium level ≤ 5.5 mmol/L., Conclusion: Our study found that our approach of additionally administering a 250 mL dextrose 10% solution upon therapy initiation is associated with significantly lower rates of hypoglycemia. Our findings indicate that hypoglycemia rates can be significantly reduced in vulnerable populations if additional preventative measures are employed., Competing Interests: Declaration of competing interest The authors declare no relevant conflicts of interest or financial relationships., (Copyright © 2024 Elsevier Inc. All rights reserved.)

Background and Objective: Hyperkalemia (HK) is an electrolyte disturbance in the concentration of potassium ions (K + ), whose risk increases in patients with chronic kidney disease (CKD) or heart failure (HF) and/or in patients being treated with renin-angiotensin-aldosterone system inhibitors (RAASi). The new oral K + chelators offer a safe and effective treatment to maintain normokalemia in these patients. The objective of the analysis is to estimate the cost-effectiveness of sodium zirconium cyclosilicate (SZC) for the treatment of chronic HK in patients with CKD or HF versus standard treatment (calcium polystyrene sulfonate and lifestyle modifications) from the perspective of the Spanish National Health System., Materials and Methods: Two microsimulation models reflecting the natural history of CKD and HF were used. In both models, K + levels were simulated individually. Based on efficacy (reduction of K + levels), quality of life of patients (utilities according to health states, and disutilities of events derived from each pathology and adverse events [AEs] of treatment) and costs considered (cost of treatment for HK, of RAASi treatment and its modification, health states, management of events derived from each pathology, HK episodes, and AEs treatment) (, 2022), clinical benefit (quality-adjusted life years [QALYs]) and cost results were obtained. A time horizon of the patient's lifetime was used and a discount rate of 3% was applied for costs and outcomes., Results: SZC is a more effective option in both pathologies, with a difference in QALYs of 0.476 in CKD and 0.978 in HF compared to standard treatment, and it represents an incremental cost of 3,616 and 14,749, respectively, obtaining an incremental cost-utility ratio of 7,605/QALY in CKD and 15,078/QALY in HF., Conclusions: SZC is a cost-effective alternative for the treatment of HK in patients with CKD or HF, taking into account the reference efficiency values commonly used in Spain., (Copyright © 2024. Published by Elsevier España, S.L.U.)

Purpose: Sodium zirconium cyclosilicate (SZC) is an oral potassium (K + )-lowering therapy for adults with hyperkalemia. HARMONIZE Asia (ClinicalTrials.gov identifier: NCT03528681) evaluated the efficacy and safety of SZC in Chinese patients with hyperkalemia., Methods: This Phase III, randomized, double-blind, placebo-controlled study recruited patients with serum K + (sK + ) ≥5.1 mmol/L at 35 sites in China. Patients received SZC 10 g three times daily (TID) for 24 or 48 hours during an open-label initial phase (OLP). Those patients achieving normokalemia (sK + 3.5-5.0 mmol/L inclusive) entered a 28-day randomized (2:2:1) treatment phase (RTP) and received SZC 5 g, SZC 10 g, or placebo once daily. The primary endpoint was mean sK + during RTP Days 8 to 29. Secondary endpoints included mean change in sK + during the OLP, the proportion of patients who achieved normokalemia at the end of the OLP, the proportion that maintained normokalemia during the RTP, and time to recurrence of hyperkalemia., Findings: In total, 270 patients received SZC 10 g TID during the OLP; 256 (94.8%) completed the OLP. During the OLP, mean sK + decreased by 1.1 mmol/L from baseline (5.9 mmol/L; P < 0.001) and 87.4% of patients achieved normokalemia. During the RTP, SZC 5 g and 10 g reduced mean sK + versus placebo in a dose-dependent manner (each P < 0.001); least-squares means (95% confidence interval [CI]) sK + were 4.9 mmol/L (4.7, 5.0), 4.4 mmol/L (4.3, 4.6), and 5.2 mmol/L (5.1, 5.4) for SZC 5 g, 10 g, and placebo, respectively. At RTP end, the proportions of patients who maintained normokalemia were 58.8% (SZC 5 g; odds ratio vs placebo, 2.5 [95% CI: 1.1, 6.1; P = 0.035]), 76.5% (SZC 10 g; odds ratio vs placebo, 6.3 [95% CI: 2.6, 15.3; P < 0.001]), and 36.8% for placebo. Risk of recurrent hyperkalemia was reduced by 61.0% and 84.0% with SZC 5 g and SZC 10 g, respectively, versus placebo (each P < 0.001). During the RTP, the incidence of adverse events was numerically higher with SZC 5 g (50.0% of patients) and 10 g (44.0%) versus placebo (36.0%); driven primarily by peripheral edema and constipation., Implications: Both SZC doses demonstrated clinically relevant and statistically significant, dose-dependent efficacy in managing sK + levels in Chinese patients with hyperkalemia, compared with placebo. SZC tolerability was broadly aligned with the known safety profile of SZC., Competing Interests: Declaration of competing interest June Zhao, Yong Zhang, and Vera Lisovskaja are employees of AstraZeneca and hold or may hold stock in AstraZeneca. Xinling Liang, Wanhong Lu, Xueqing Yu, Hong Cheng, Qiang He, Qingfeng Peng, Zhaohui Ni, Gang Long, Lihua Wang, Wei Chen, Rong Li, and Zhiji Tang report no disclosures. This study is sponsored by AstraZeneca. The sponsor was involved in the study design, writing of the article, and the decision to submit the article for publication. Ultimate responsibility for opinions, conclusions, and data interpretation lies with the authors., (Copyright © 2024. Published by Elsevier Inc.)

Background: Patiromer and sodium zirconium cyclosilicate (SZC) are 2 oral potassium binders approved for chronic hyperkalemia. It is unknown if one is more effective at reducing serum potassium than the other in acute hyperkalemia., Objective: The objective of this study was to determine if there was a difference between patiromer and SZC in the reduction of serum potassium in patients with acute hyperkalemia., Methods: This was a single-center, retrospective, observational study. Patients with a nonhemolyzed serum potassium level of 5.5 mEq/L or greater and received at least one dose of patiromer or SZC were included. The primary outcome was to determine the difference in effectiveness between patiromer and SZC in lowering of serum potassium 6 to 24 hours after administration. Secondary outcomes included description of total dosage received in 24 hours and incidence of electrolyte changes., Results: A total of 200 patients were included in this study, with 100 patients in each group. Serum potassium was significantly reduced by both patiromer (-1.2 mEq/L, 95% confidence interval [CI]: -2.3 to -0.2) and SZC (-0.8 mEq/L, 95% CI: -1.0 to -0.7), but there was no difference between the 2 medications in the amount of potassium reduction ( P = 0.464). No clinically significant differences in electrolyte changes were seen., Conclusions and Relevance: This study represents the first head-to-head comparison of patiromer and SZC in the setting of acute hyperkalemia. No difference in effectiveness between patiromer and SZC in reducing serum potassium was seen. Both agents can be considered in acute hyperkalemia management., Competing Interests: Declaration of Conflicting InterestsThe authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Inpatient treatment of hyperkalaemia with insulin and dextrose can be complicated by iatrogenic hypoglycaemia. We sought to assess the incidence of hypoglycaemia in hospitalised patients with renal disease and assess the impact of the introduction of a local guideline incorporating the use of sodium zirconium cyclosilicate (SZC) for patients with moderate hyperkalaemia. After establishing a significant burden of hypoglycaemia in the initial observation period, a requirement for hourly capillary blood glucose monitoring (for up to 6 h) following the administration of insulin for hyperkalaemia was incorporated into the guidelines. The two-fold introduction of SZC alongside changes in patient care after the administration of insulin/dextrose resulted in more appropriate use of insulin/dextrose, as well as a significant (73%) reduction in the iatrogenic burden of hypoglycaemia (P = 0.04)., Competing Interests: Declaration of competing interest None of the authors have any conflict of interest or relationships with industry that could have influenced this manuscript., (Copyright © 2024. Published by Elsevier Ltd.)

Objective Variations are present in common clinical practices regarding best practice in managing hyperkalaemia (HK), there is therefore a need to establish a multi-specialty approach to optimal renin-angiotension-aldosterone system inhibitors (RAASi) usage and HK management in patients with chronic kidney disease (CKD) & heart failure (HF).This study aimed to establish a multi-speciality approach to the optimal use of RAASi and the management of HK in patients with CKD and HF. Methods A steering expert group of cardiology and nephrology experts across China were convened to discuss challenges to HK management through a nominal group technique. The group then created a list of 41 statements for a consensus questionnaire, which was distributed for a further survey in extended panel group of cardiologists and nephrologists across China. Consensus was assessed using a modified Delphi technique, with agreement defined as "strong" (≥75% and <90%) and "very strong" (≥90%). The steering group, data collection, and analysis were aided by an independent facilitator. Results A total of 150 responses from 21 provinces across China were recruited in the survey. Respondents were comprised of an even split ( n =75, 50%) between cardiologists and nephrologists. All 41 statements achieved the 75% consensus agreement threshold, of which 27 statements attained very strong consensus (≥90% agreement) and 14 attained strong consensus (agreement between 75% and 90%). Conclusion Based on the agreement levels from respondents, the steering group agreed a set of recommendations intended to improve patient outcomes in the use of RAASi therapy and HK management in China.

Introduction: Calcineurin inhibitors (CNIs) are widely used in transplantation. Although CNI-related hyperkalemia is common (10%-60.6%), the underlying pathogenetic mechanism is not well-elucidated and may lead to dose adjustment or treatment withdrawal., Objective: The aim of this study is to describe CNI-related hyperkalemia due to hyporeninemic hypoaldosteronism in pediatric transplant recipients who were successfully treated with fludrocortisone., Method: In a total of 55 hematopoietic stem cell (HSCT) and 35 kidney transplant recipients followed according to institutional immunosuppression protocols, recipients diagnosed with CNI-related hyperkalemia were reviewed. Recipients who were receiving intravenous fluid, potassium, or were diagnosed with hemolysis, acute graft rejection, or had an eGFR < 30 mL/min/1.73m 2 , were excluded. A detailed analysis of clinical history as well as biochemical studies was carried out to reveal possible pathophysiology., Results: Three pediatric transplant recipients (one HSCT, two kidney transplantation) with findings of hyperkalemia, hyponatremia, and a mild elevation in blood urea nitrogen while on CNIs were recruited. Urinary potassium excretion was diminished while sodium excretion was increased. Plasma aldosterone levels were low, and renin was not increased in response. Primary adrenal insufficiency was ruled out, and hyporeninemic hypoaldosteronism was diagnosed. CNI-related hyperkalemia was detected earlier in case 1, who had HSCT (22 days), than in the second and third cases, who had kidney transplantation (24 and 30 months post-transplantation, respectively). The discrepancy was hypothesized to be explained by higher overall CNI dose due to higher serum target CNI used in HSCT than kidney transplantation. Electrolyte imbalance was reversed upon administration of physiologic dose fludrocortisone (0.05 mg, daily), while fludrocortisone was ceased after CNI withdrawal in case 1, which is additional evidence for the etiological association of CNIs and hyporeninemic hypoaldosteronism., Conclusion: Our three cases strengthen the premise that CNI-related hyperkalemia may be due to hyporeninemic hypoaldosteronism, and the timing and severity may be related to CNI dose. Fludrocortisone is a safe and effective treatment in CNI-related hyperkalemia, providing maintenance of CNIs, which are one of the essential therapeutic agents for pediatric transplantation., (© 2024 Wiley Periodicals LLC.)

Nafamostat mesylate, a synthetic serine protease inhibitor, has been shown to have antiviral activity against SARS-CoV-2 and anticoagulant properties that may be beneficial in the treatment of COVID-19. We conducted a meta-analysis to evaluate the effectiveness and safety of nafamostat mesylate for the treatment of COVID-19. PubMed, Embase, Cochrane Library, Scopus, Web of Science, medRxiv, and bioRxiv were searched up to July 2023 for studies comparing the outcomes of nafamostat mesylate treatment and no nafamostat mesylate treatment in patients with COVID-19. Mortality, disease progression, and adverse events were analyzed. Six studies involving 16,195 patients were included in the analysis. Meta-analysis revealed no significant difference in mortality (odds ratio [OR]: 0.88, 95% CI: 0.20-3.75, P = 0.86) or disease progression (OR: 2.76, 95% CI: 0.31-24.68, P = 0.36) between groups. However, nafamostat mesylate was associated with an increased risk of hyperkalemia (OR: 7.15, 95% CI: 2.66-19.24, P < 0.0001). Nafamostat mesylate did not improve mortality or morbidity in hospitalized patients with COVID-19. The risk of hyperkalemia is a serious concern that requires monitoring and preventive measures. Further research in different COVID-19 populations is required.

Purpose: While intravenous (IV) insulin is often administered at a fixed dose of 10 units for acute hyperkalemia, optimal dosing for minimizing hypoglycemia while effectively reversing hyperkalemia has not been established. The purpose of this analysis was to evaluate the effect of insulin dosing strategies on hypoglycemia in patients with hyperkalemia., Methods: Adult patients presenting to an academic medical center who received IV insulin for hyperkalemia between 2016 and 2020 were retrospectively identified. Patients treated with 10 units of insulin (fixed) were compared to those who received < 10 units (reduced). The primary outcome was the incidence of hypoglycemia (blood glucose < 70 mg/dL) within 12 hours of insulin administration. Secondary outcomes included the incidence of severe hypoglycemia (blood glucose < 40 mg/dL) and change in potassium. Multivariable analyses were used to assess for risk factors for hypoglycemia and severe hypoglycemia., Findings: Of the 2576 patients included, 305 (11.8%) received reduced dosing and 2271 (88.2%) received fixed dosing. Hypoglycemia occurred in 16.7% of the reduced group and 15.9% of the fixed group (P = 0.70). Severe hypoglycemia occurred in 2.3% of the reduced group and 2.5% of the fixed group (P = 0.86). Median potassium reduction from baseline to first check post-insulin was less with reduced dosing (-0.6 mEq/L vs -0.8 mEq/L, P < 0.001). On multivariable regression analysis, greater weight-based insulin dose and ED location were significant predictors for hypoglycemia and severe hypoglycemia. Location in the intensive care unit was associated with a decreased risk of hypoglycemia. Higher pre-insulin glucose was protective for hypoglycemia and severe hypoglycemia., Implications: The incidence of hypoglycemia was similar among both groups. Greater weight-based insulin dose was a significant risk factor for hypoglycemia, while higher baseline glucose levels were associated with a decreased risk, indicating that patient-specific insulin dosing for hyperkalemia may be warranted., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Jeremy DeGrado reports a relationship with Pfizer Inc that includes: consulting or advisory. Jeremy DeGrado reports a relationship with Eli Lilly and Company that includes: consulting or advisory. Jeremy DeGrado reports a relationship with Marinus Pharmaceuticals Inc that includes: consulting or advisory. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)

Introduction: Hyperkalemia, one of the most important electrolyte abnormalities of chronic kidney disease (CKD), often limits the use of renin-angiotensin-aldosterone system inhibitors and can increase in the postprandial period. In this study we report a real-world experience with the new non-adsorbed potassium binder patiromer in stage 3b-4 CKD patients. Moreover, we performed a cross-sectional analysis to evaluate, for the first time, the efficacy of patiromer in the control of postprandial potassium concentrations., Methods: We retrospectively collected data of 40 patients at the time of patiromer initiation (T0), and after 2 (T2), 6 (T6) and 12 (T12) months of treatment. For cross sectional analysis, a blood sample was collected 2 h after the main meal for the evaluation of postprandial potassium concentrations., Results: Eighty-two point five percent of patients (33/40) reached normal potassium concentrations at T2. Serum potassium significantly decreased at T2 compared to T0 (5.13 ± 0.48 vs 5.77 ± 0.41 mmol/L, respectively; p < 0.001) and the reduction remained significant during the follow-up (5.06 ± 0.36 at T6 and 5.77 ± 0.41 at T12; p < 0.001 vs T0). Renin-angiotensin-aldosterone system inhibitors were continued by 93% of patients (27/29). Adverse events were reported in 27.5% of patients and were all mild-to-moderate. Postprandial potassium concentrations did not significantly change compared to fasting state potassium measured at T12 (4.53 ± 0.33 vs 5.06 ± 0.36 mmol/L; p = 0.15)., Conclusions: In a real-world setting of advanced CKD patients, patiromer is a useful treatment for hyperkalemia, since it significantly reduces serum potassium levels over the long term and is able to maintain potassium concentrations in the normal range even in the post-prandial period., (© 2024. The Author(s) under exclusive licence to Italian Society of Nephrology.)

There is limited literature evaluating the use of nebulized albuterol in the management of hyperkalemia. The objective was to evaluate the efficacy of insulin alone compared with the addition of nebulized albuterol for the treatment of hyperkalemia. This is a retrospective, single-center evaluation of adult patients with hyperkalemia attending the Emergency Department of a large urban academic medical center. Consecutive patients with a potassium level of >5 mmol/L were included. Patients without a repeat potassium level within 4 hours of medication administration, those receiving hemodialysis before a repeat serum potassium, or those that had a hemolyzed blood sample were excluded. The primary outcome was the change in potassium level within 4 hours in patients who received insulin monotherapy versus patients who received insulin and albuterol. The secondary outcomes included hospital length of stay, intensive care unit (ICU) admission, and mortality. Out of the 204 patients, 141 received insulin, whereas 63 received insulin and nebulized albuterol. There was no difference in the change in potassium level between the insulin and the insulin and nebulized albuterol groups (0.85 ± 0.6 vs 0.96 ± 0.78 mmol/L; P = .36). There was no difference in median hospital length of stay (8.6 days, IQR 13.2 days, vs 5.6 days, IQR 8.2 days; P = .09), ICU admission (31.9% vs 38.1%; P = .39), and all-cause mortality (14.9% vs 17.5%; P = .64). In this retrospective analysis, the addition of albuterol to insulin for the treatment of hyperkalemia did not result in a greater change in potassium level within 4 hours of therapy., (© 2023, The American College of Clinical Pharmacology.)

Introduction: Hyperkalaemia (HK) is prevalent among patients with chronic kidney disease (CKD) and chronic heart failure, especially if they are treated with renin-angiotensin-aldosterone system inhibitors (RAASi). This study evaluated the cost-effectiveness of a newly developed anti-HK therapy, sodium zirconium cyclosilicate (SZC), to the current standard of care for treating HK in advanced CKD patients from the Singapore health system perspective., Methods: We adapted a global microsimulation model to simulate individual patients' potassium level trajectories with baseline potassium ≥5.5 mmol/L, CKD progression, changes in treatment, and other fatal and non-fatal events. Effectiveness data was derived from ZS-004 and ZS-005 trials. Model parameters were localised using CKD patients' administrative and medical records at the Singapore General Hospital Department of Renal Medicine. We estimated the lifetime cost and quality-adjusted life years (QALYs) of each HK treatment, and the incremental cost-effectiveness ratio of SZC., Results: SZC demonstrated cost-effectiveness with an incremental cost-effectiveness ratsio of SGD 45 068 per QALY over a lifetime horizon, below the willingness-to-pay threshold of SGD 90 000 per QALY. Notably, SZC proved most cost-effective for patients with less severe CKD who were concurrently using RAASi. Sensitivity analyses confirmed the robustness of the findings, accounting for alternative parameter values and statistical uncertainty., Conclusion: This study establishes the cost-effectiveness of SZC as a treatment for HK, highlighting its potential to mitigate the risk of hyperkalaemia and optimise RAASi therapy. These findings emphasise the value of integrating SZC into the Singapore health system for improved patient outcomes and resource allocation., (© 2024 The Authors. Nephrology published by John Wiley & Sons Australia, Ltd on behalf of Asian Pacific Society of Nephrology.)

Heart failure is a chronic and invalidating syndrome that affects tens of millions of people worldwide with significant socio-economic ramifications for the health care systems. Significant progress in the understanding of the pathophysiology of heart failure has allowed the gradual introduction of several drug classes for the management of such patients. Beta-blockers, mineralocorticoid receptor antagonists, angiotensin receptor neprilysin inhibitors, and sodium-glucose-cotransporter 2 inhibitors are all considered pillars of the guideline-directed medical therapy for heart failure. Despite remarkable improvements in the morbidity and mortality of heart failure, however, many patients still develop clinically significant hyperkalemia during combined treatment with those four pharmacological pillars. The consequence is often a down-titration or discontinuation of one or more crucial drugs, which in turns leads to a considerable increase in the risk of cardiovascular events, dialysis, and all-cause mortality. This paper will explore novel approaches for the management of hyperkalemia in heart failure, including closer monitoring of potassium levels, early review of drugs that might increase the risk of hyperkalemia, and pharmacological treatment of hyperkalemia, with a special emphasis on sodium-glucose-cotransporter 2 inhibitors and potassium-binding agents, including patiromer and sodium zirconium cyclosilicate., (© 2024. The Author(s), under exclusive licence to Società Italiana di Medicina Interna (SIMI).)

Purpose of Review: Hyperkalemia is a potentially fatal electrolyte abnormality with no standardized management. The purpose of this review is to provide the knowledge needed for timely and effective management of hyperkalemia in children. It describes the utility of existing and novel therapies., Recent Findings: Two newer oral potassium binding agents, patiromer sorbitex calcium and sodium zirconium cyclosilicate, have been FDA-approved for the management of hyperkalemia in adults. These newer agents offer hope for improved management, even though their use in pediatric patients requires further exploration., Summary: This review highlights the causes and life-threatening effects of hyperkalemia and provides a comprehensive overview of the management of hyperkalemia in both acute and chronic settings along with upcoming treatment strategies., (Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.)

Background: The effectiveness and safety of mineralocorticoid receptor antagonists (MRA) in acute heart failure (HF) is uncertain. We sought to describe the prescription of spironolactone during acute HF and whether early treatment is effective and safe in a real-world setting., Methods: We performed a retrospective cohort study of adult (≥18 years) nonpregnant patients hospitalized with new-onset HF with reduced ejection fraction (HFrEF, defined by ejection fraction ≤40%) within 15 Kaiser Permanente Southern California medical centers between 2016 and 2021. Early treatment was defined by spironolactone prescription at discharge. The primary effectiveness outcome was a composite of HF readmission or all-cause mortality at 180 days. Safety outcomes were hypotension and hyperkalemia at 90 days., Results: Among 2318 HFrEF patients, 368 (15.9%) were treated with spironolactone at discharge. After 1:2 propensity score matching, 354 early treatment and 708 delayed/no treatment patients were included in the analysis. The median age was 63 (IQR: 52-74) years; 61.6% were male, and 38.6% were White. By 90 days, ~20% had crossed over in the two groups. Early treatment was not associated with the composite outcome at 180 days (HR [95% CI]: 0.81 [0.56-1.17]), but a trend towards benefit by 365 days that did not reach statistical significance (0.78 [0.58-1.06]). Early treatment was also associated with hyperkalemia (subdistribution HR [95% CI]: 2.33 [1.30-4.18]) but not hypotension (0.93 [0.51-1.72])., Conclusions: Early treatment with spironolactone at discharge for new-onset HFrEF in a real-world setting did not reduce the risk of HF readmission or mortality in the first year after discharge. The risk of hyperkalemia was increased., (© 2024 Society of Hospital Medicine.)

Background: Sodium zirconium cyclosilicate (SZC) is an approved oral treatment for hyperkalemia that selectively binds potassium (K + ) in the gastrointestinal tract and removes K + from the body through increased fecal excretion. Here, we describe the population pharmacodynamic (PopPD) response of serum K + concentration in patients with hyperkalemia who are treated with SZC, estimate the impact of patients' intrinsic and extrinsic factors, and compare predicted serum K + responses between 5 g alternate daily (QOD) and 2.5 g once daily (QD) maintenance doses., Methods: PopPD analysis was based on pooled data from seven phase II and III clinical trials for SZC. A semi-mechanistic longitudinal mixed-effects (base) model was used to characterize serum K + concentration after SZC dosing. Indirect-response, virtual pharmacokinetics-pharmacodynamics (PK-PD) modeling was used to mimic the drug exposure compartment. Full covariate modeling was used to assess covariate impact on the half-maximal effective concentration of drug (EC 50 ), placebo response, and K out . Models were evaluated using goodness-of-fit plots, relative standard errors, and visual predictive checks, and data were stratified to optimize model performance across subgroups. Covariate effects were evaluated based on the magnitude of change in serum K + between baseline and end of correction phase dosing (48 h, SZC 10 g three times a day) and maintenance phase dosing (28 days, SZC 10 g QD) using a reference subject., Results: The analysis data set included 2369 patients and 25,764 serum K + observations. The mean (standard deviation) patient age was 66.0 (12) years, 61% were male, 68% were White, 34% had congestive heart failure, and 62% had diabetes. Mean (standard deviation) serum K + at baseline was 5.49 (0.43) mmol/L. Both the base and full covariance models adequately described observed data. In the final model, there was a sigmoid exposure response on K in , with EC 50 of 32.8 g and a Hill coefficient of 1.36. The predicted placebo-adjusted dose-responses of serum K + change appeared nearly linear in the correction and maintenance phases. No clinically meaningful difference in placebo-adjusted serum K + change from baseline at 28 days was observed between maintenance regimens of SZC 5 g QOD and 2.5 g QD. A greater SZC treatment response was associated with high serum K + at baseline, advanced age, lower body weight, lower estimated glomerular filtration rate, and Black/African American and Asian race, compared with the reference patient. The impact of heart failure status and diabetes status was only minor., Conclusions: The PopPD model of SZC adequately described changes in serum K + concentration during correction and maintenance phase dosing. A greater treatment response was associated with various covariates, but the impact of each was modest. Overall, these findings suggest that no adjustment in SZC dose is needed for any of the covariates evaluated., (© 2024. The Author(s).)

Background: Hyperkalemia is a common electrolyte abnormality that requires urgent treatment. Insulin is an effective treatment for hyperkalemia, but risk factors for developing insulin-induced hypoglycemia exist (e.g., low pretreatment glucose or renal impairment)., Objective: This study evaluated the impact of a hyperkalemia protocol tailored to glucose concentration and renal function on insulin-induced hypoglycemia., Methods: This was a retrospective cohort study of emergency department patients with glucose ≤ 100 mg/dL treated with insulin for hyperkalemia. The primary outcome was incidence of hypoglycemia in patients treated prior to (July 1, 2018-June 30, 2019) vs. after (January 1, 2020-December 31, 2020) the protocol update, which individualized insulin and dextrose doses by glucose concentration and renal function. Secondary outcomes included change in potassium and protocol safety. We assessed factors associated with hypoglycemia using multiple logistic regression., Results: We included 202 total patients (preimplementation: 114, postimplementation: 88). Initial insulin dose was lower in the postimplementation group (p < 0.001). We found a nonsignificant reduction in hypoglycemia in the postimplementation group (42.1% vs. 30.7%, p = 0.10). Degree of potassium reduction was similar in patients who received insulin 5 units vs. 10 units (p = 0.72). Higher pretreatment glucose (log odds ratio [OR] -0.05, 95% confidence interval [CI] -0.08 to -0.02) and additional insulin administration (log OR -1.55, 95% CI -3.01 to -0.25) were associated with reduced risk of developing hypoglycemia., Conclusion: A hyperkalemia protocol update was not associated with a significant reduction in hypoglycemia, and the incidence of hypoglycemia remained higher than anticipated. Future studies attempting to optimize treatment in this high-risk population are warranted., Competing Interests: Declaration of competing interest None., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Trimethoprim-sulfamethoxazole (TMP-SMX) is the primary therapeutic option for Pneumocystis jirovecii pneumonia (PCP). Gastrointestinal symptoms and cutaneous rash are common side effects, with hyperkalemia being uncommon in patients without kidney dysfunction, and myelotoxicity being even rarer. We present the case of a male patient with hypertension and a recent diagnosis of non-Hodgkin lymphoma, undergoing rituximab treatment for two months. He was admitted to the intensive care unit due to dyspnea, tachypnea, and pleuritic pain, requiring mechanical ventilation. Chest computed tomography showed bilateral and multilobed ground-glass opacities, compromising more than 80% of the lung parenchyma. Pulmonary tuberculosis and COVID-19 were ruled out. An angiotomography and Doppler ultrasound revealed an extensive pulmonary thrombus and deep venous thrombosis. Empiric treatment with TMP-SMX for PCP was initiated, but within four days, the patient experienced metabolic acidosis and severe hyperkalemia, necessitating hemodialysis. He also presented with progressive pancytopenia and critical levels of leukopenia and thrombocytopenia. The hypothesis of TMP-SMX-induced myelotoxicity was suspected. Considering the unavailability of an alternative treatment, it was opted to continue TMP-SMX and initiate a granulocyte-colony-stimulating factor. However, the patient maintained medullary deterioration, becoming refractory to the transfusion of blood derivates. On the 17th day of treatment, a clinical decision was made to suspend TMP-SMX, leading to improvements within 48 hours in marrow and kidney functions, metabolic acidosis, and hyperkalemia. Despite all efforts, the patient died after 35 days of hospitalization due to hospital-acquired infections. This case highlights the importance of clinicians recognizing potential myelotoxicity with TMP-SMX and promptly discontinuing the drug if necessary.

Objective: Spironolactone (SPL) has been used to manage hyperandrogenic manifestations in women with polycystic ovary syndrome (PCOS), but data on the risk of hyperkalemia in this population are scarce. The aim of this study was to evaluate the incidence of hyperkalemia in women with PCOS using SPL in the long term., Design: Single-centre retrospective study., Patients: Inclusion and analysis of 98 treatment periods in 78 women with PCOS (20 of whom were duplicates, returning after treatment interruption for a mean of 38 months) who received SPL for a minimum of 12 months and had at least three measurements of potassium levels over time., Measurements: Clinical and hormonal profiles before and during SPL treatment., Results: Mean age was 29.1 (SD: 9.6) years, and body mass index was 32.2 (SD: 8.1) kg/m². Nine patients had diabetes, and 22 had prediabetes. SPL was used in combination with combined oral contraceptive pills in 55 participants and progestin-only pills/long-acting reversible contraception in 28; metformin was added in 35, and angiotensin-converting enzyme inhibitors/angiotensin receptor blockers in 15. Median SPL dose was 100 (range: 50-150) mg. A total of 327 serum potassium measurements were obtained (84 pre-exposure and 243 postexposure). Four potassium measurements were above the reference range before exposure and 19 during exposure. All potassium measurements above the reference range during follow-up were classified as mild hyperkalemia (5.1-5.5 mEq/L)., Conclusions: The present findings suggest that women with PCOS, without kidney or heart disease, using SPL combined with hormonal contraception for managing clinical hyperandrogenism have a low incidence of hyperkalemia and well-tolerated minor adverse effects., (© 2023 John Wiley & Sons Ltd.)

Hyperkalemia is a common adverse event in patients with chronic kidney disease (CKD) and type 2 diabetes and limits the use of guideline-recommended therapies such as renin-angiotensin system inhibitors. Here, we evaluated the comparative effects of sodium-glucose cotransporter-2 inhibitors (SGLT-2i), glucagon-like peptide-1 receptor agonists (GLP-1RA) and dipeptidyl peptidase-4 inhibitors (DPP-4i) on the risk of hyperkalemia. We conducted a population-based active-comparator, new-user cohort study using claims data from Medicare and two large United States commercial insurance databases (April 2013-April 2022). People with CKD stages 3-4 and type 2 diabetes who newly initiated SGLT-2i vs. DPP-4i (141671 patients), GLP-1RA vs. DPP-4i (159545 patients) and SGLT-2i vs. GLP-1RA (93033 patients) were included. The primary outcome was hyperkalemia diagnosed in inpatient or outpatient settings. Secondary outcomes included hyperkalemia diagnosed in inpatient or emergency department setting, and serum potassium levels of 5.5 mmol/L or more. Pooled hazard ratios and rate differences were estimated after propensity score matching to adjust for over 140 potential confounders. Initiation of SGLT-2i was associated with a lower risk of hyperkalemia compared with DPP-4i (hazard ratio 0.74; 95% confidence interval 0.68-0.80) and contrasted to GLP-1RA (0.92; 0.86-0.99). Compared with DPP-4i, GLP-1RA were also associated with a lower risk of hyperkalemia (0.80; 0.75-0.86). Corresponding absolute rate differences/1000 person-years were -24.8 (95% confidence interval -31.8 to -17.7), -5.0 (-10.9 to 0.8), and -17.7 (-23.4 to -12.1), respectively. Similar findings were observed for the secondary outcomes, among subgroups, and across single agents within the SGLT-2i and GLP-1RA classes. Thus, SGLT-2i and GLP-1RA are associated with a lower risk of hyperkalemia than DPP-4i in patients with CKD and type 2 diabetes, further supporting the use of these drugs in this population., (Copyright © 2023 International Society of Nephrology. Published by Elsevier Inc. All rights reserved.)

Objectives: Traditional potassium (K + ) binders for treating hyperkalaemia are unpalatable and poorly tolerated. Newer K + binders are reportedly better tolerated; however, no published data describe their palatability, a determinant of long-term adherence. This study evaluated the palatability of and preference for three K + binders: sodium and calcium polystyrene sulfonate (S/CPS), sodium zirconium cyclosilicate (SZC) and calcium patiromer sorbitex (patiromer)., Design: Phase 4, randomised, participant-blinded, cross-over study. Participants were randomised to one of six taste sequences and, using a 'sip and spit' approach, tasted each K + binder before completing a survey., Setting: 17 centres across the USA, Canada and European Union., Participants: 144 participants with chronic kidney disease, hyperkalaemia and no recent use of K + binders., Main Outcome Measures: For the primary (USA) and key secondary (Canada and European Union) endpoints, participants rated palatability attributes (taste, texture, smell and mouthfeel) and willingness to take each K + binder on a scale of 0-10 (rational evaluation). Feelings about each attribute, and the idea of taking the product once daily, were evaluated using a non-verbal, visual measure of emotional response. Finally, participants ranked the K + binders according to palatability., Results: In each region, SZC and patiromer outperformed S/CPS on overall palatability (a composite of taste, texture, smell and mouthfeel), based on rational evaluation and emotional response. Taking the product once daily was more appealing for SZC and patiromer, creating greater receptivity than the idea of taking S/CPS. The emotional response to mouthfeel had the strongest influence on feelings about taking each product. In each region, a numerically greater proportion of participants ranked SZC as the most preferred K + binder versus patiromer or S/CPS., Conclusions: Preference for more palatable K + binders such as SZC and patiromer may provide an opportunity to improve adherence to long-term treatment of hyperkalaemia., Trial Registration Number: NCT04566653., Competing Interests: Competing interests: DCW reports an ongoing consultancy contract with AstraZeneca and honoraria/speaker fees from Astellas, Bayer, Boehringer Ingelheim, George Clinical, GSK, Gilead, Janssen, Merck Sharp and Dohme, ProKidney, Tricida, Vifor and Zydus. HS has nothing to disclose. KH, JH, AA, H-LC, MN, GS, EW and JK are employees of and may hold stock in AstraZeneca. JM and CG are employees of AdSAM., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Guideline-directed medical therapy (GDMT) has improved outcomes in patients with heart failure, including the use of renin-angiotensin-aldosterone system inhibitors, which can hinder the excretion of potassium, resulting in hyperkalaemia. New potassium binders (NPBs) can prevent this adverse effect; however, the efficacy and safety of NPB for this indication have not been fully established. We conducted a systematic review and meta-analysis synthesizing randomized controlled trials (RCTs), which were retrieved by systematically searching PubMed, Web of Science, Scopus, and Cochrane through 26 April 2023. The risk of bias assessment was conducted, following Cochrane's updated Risk of Bias 2 assessment tool. We used the fixed-effects model to pool dichotomous data using risk ratio (RR) and continuous data using mean difference (MD), with a 95% confidence interval (CI) (PROSPERO ID: CRD42023426113). We included six RCTs with a total of 1432 patients. NPB was significantly associated with successful mineralocorticoid receptor antagonist (MRA) optimization [RR: 1.13 with 95% CI (1.02-1.25), P = 0.02], decreased patients with MRA at less than the target dose [RR: 0.72 with 95% CI (0.57-0.90), P = 0.004], and decreased hyperkalaemic episodes [RR: 0.42 with 95% CI (0.24-0.72), P = 0.002]. However, there was no difference between NPB and placebo regarding angiotensin-converting enzyme inhibitor (ACEi)/angiotensin receptor blocker (ARB)/angiotensin receptor/neprilysin inhibitor (ANRi) optimization [RR: 1.02 with 95% CI (0.89-1.17), P = 0.76] and serum potassium change [MD: -0.31 with 95% CI (-0.61 to 0.00), P = 0.05], with an acceptable safety profile except for the increased incidence of hypokalaemia with NPB [RR: 1.57 with 95% CI (1.12-2.21), P = 0.009]. NPB has been shown to improve GDMT outcomes by enhancing MRA optimization and reducing hyperkalaemic episodes. However, there are limited data on the effects of NPB on ACEi/ARB/ANRi optimization. Future RCTs should investigate ACEi/ARB/ANRi optimization and conduct head-to-head comparisons of NPB (patiromer and sodium zirconium cyclosilicate)., (© 2023 The Authors. ESC Heart Failure published by John Wiley & Sons Ltd on behalf of European Society of Cardiology.)

Objectives: Current international guidelines recommend administrating calcium chloride and sodium bicarbonate to patients with hyperkalemia-induced cardiac arrest, despite limited evidence. The aim of this study was to evaluate the efficacy of calcium chloride and sodium bicarbonate on return of spontaneous circulation (ROSC) in a pig model of hyperkalemia-induced cardiac arrest., Design: A randomized, blinded, placebo-controlled experimental pig study. Hyperkalemia was induced by continuous infusion of potassium chloride over 45 minutes followed by a bolus. After a no flow period of 7 minutes, pigs first received 2 minutes of basic cardiopulmonary resuscitation and subsequently advanced life support. The first intervention dose was administered after the fifth rhythm analysis, followed by a defibrillation attempt at the sixth rhythm analysis. A second dose of the intervention was administered after the seventh rhythm analysis if ROSC was not achieved. In case of successful resuscitation, pigs received intensive care for 1 hour before termination of the study., Setting: University hospital laboratory., Subjects: Fifty-four female Landrace/Yorkshire/Duroc pigs (38-42 kg)., Interventions: The study used a 2 × 2 factorial design, with calcium chloride (0.1 mmol/kg) and sodium bicarbonate (1 mmol/kg) as the interventions., Measurements and Main Results: Fifty-two pigs were included in the study. Sodium bicarbonate significantly increased the number of animals achieving ROSC (24/26 [92%] vs. 13/26 [50%]; odds ratio [OR], 12.0; 95% CI, 2.3-61.5; p = 0.003) and reduced time to ROSC (hazard ratio [HR] 3.6; 95% CI, 1.8-7.5; p < 0.001). There was no effect of calcium chloride on the number of animals achieving ROSC (19/26 [73%] vs. 18/26 [69%]; OR, 1.2; 95% CI, 0.4-4.0; p = 0.76) or time to ROSC (HR, 1.5; 95% CI, 0.8-2.9; p = 0.23)., Conclusions: Administration of sodium bicarbonate significantly increased the number of animals achieving ROSC and decreased time to ROSC. There was no effect of calcium chloride on the number of animals achieving ROSC or time to ROSC., Competing Interests: Dr. Granfeldt’s institution received funding from NMD Pharma; he received funding from Noorik Pharmaceuticals; and he was supported by a grant from the Health Research Foundation of Central Denmark Region. The remaining authors have disclosed that they do not have any potential conflicts of interest., (Copyright © 2023 by the Society of Critical Care Medicine and Wolters Kluwer Health, Inc. All Rights Reserved.)

Potassium (K + ) is the main intracellular cation in the body. Elevated K + levels (hyperkalemia) increase the risk of life-threatening arrhythmias and sudden cardiac death. However, the details of K + homeostasis and the effects of orally administered K + binders, such as sodium zirconium cyclosilicate (SZC), on K + redistribution and excretion in patients remain incompletely understood. We built a fit-for-purpose systems pharmacology model to describe K + homeostasis in hyperkalemic subjects and capture serum K + (sK + ) dynamics in response to acute and chronic administration of SZC. The resulting model describes K + distribution in the gastrointestinal (GI) tract, blood, and extracellular and intracellular spaces of tissue, renal clearance of K + , and K + -SZC binding and excretion in the GI tract. The model, which was fit to time-course sK + data for individual patients from two clinical trials, accounts for bolus delivery of K + in meals and oral doses of SZC. The virtual population of patients derived from fitting the model to these trials was then modified to predict the SZC dose-response and inform clinical trial design in two new applications: emergency lowering of sK + in severe hyperkalemia and prevention of hyperkalemia between dialysis sessions in patients with end-stage chronic kidney disease. In both cases, the model provided novel and useful insight that was borne out by the now completed clinical trials, providing a concrete case study of fit-for-purpose, model-informed drug development after initial approval of a drug., (© 2023 AstraZeneca. CPT: Pharmacometrics & Systems Pharmacology published by Wiley Periodicals LLC on behalf of American Society for Clinical Pharmacology and Therapeutics.)

Background: Chronic kidney disease (CKD) poses a significant health risk in contemporary society. Current CKD treatments primarily involve renin-angiotensin-aldosterone system inhibitors and mineralocorticoid receptor antagonists, albeit associated with hyperkalemia risks. A novel selective mineralocorticoid receptor antagonist, finerenone, offers a promising, safer alternative for CKD therapy. This review comprehensively assesses the role and efficacy of finerenone in CKD treatment by analyzing clinical and animal studies. Emerging evidence consistently supports finerenone's ability to effectively slow the progression of CKD. By targeting the mineralocorticoid receptor, finerenone not only mitigates renal damage but also exhibits a favorable safety profile, minimizing hyperkalemia concerns., Conclusion: Finerenone emerges as a valuable addition to CKD therapy, demonstrating potential benefits in delaying CKD progression while minimizing side effects. Nevertheless, further clinical trials are necessary to provide a comprehensive understanding of its safety and efficacy., (© 2023. The Author(s), under exclusive licence to Japanese Society of Nephrology.)

Problem: Hyperkalemia is a serious condition among intra-abdominal transplant recipients, and the safety and efficacy of sodium zirconium cyclosilicate (SZC) for its management during the early post-transplant period are not well-established., Methods: Adults who received at least one 10-g dose of SZC within 14 days after an intra-abdominal transplant between January 2020 and July 2022 were included in our study. The primary outcome was the change in potassium (K+) levels following the first SZC dose. Other analyses explored adjunctive potassium-lowering therapies, potential gastrointestinal complications, and patient subgroups based on therapy and transplant type., Results: Among the recipients (n = 46), 11 were kidney recipients, 26 were liver recipients, seven were simultaneous liver/kidney recipients, and two were simultaneous pancreas/kidney recipients. The mean time to first dose post-transplant was 7.6 (±4) days, and the mean change in serum K+ after the initial SZC dose was -.27 mEq (p = .001). No gastrointestinal complications were observed following the SZC dose. The mean increase in serum bicarbonate was .58 mEq (p = .41) following the first dose of SZC. Four kidney recipients required dialysis following the SZC dose., Conclusion: This study represents the largest investigation on the use of SZC in transplant recipients. A single 10-g dose of SZC reduced serum K+ levels in all subgroups, while the use of adjunctive K+-lowering therapies did not provide additional reduction beyond the effects of SZC. Importantly, no gastrointestinal complications were observed. These findings suggest that SZC may be a safe and promising therapeutic option for hyperkalemia management following solid organ transplantation., (© 2023 The Authors. Clinical Transplantation published by John Wiley & Sons Ltd.)

Aim: It is unknown whether safety and clinical endpoints by use of sacubitril/valsartan (an angiotensin receptor-neprilysin inhibitor [ARNI]) are affected by mineralocorticoid receptor antagonists (MRA) in high-risk myocardial infarction (MI) patients. The aim of this study was to examine whether MRA modifies safety and clinical endpoints by use of sacubitril/valsartan in patients with a MI and left ventricular systolic dysfunction (LVSD) and/or pulmonary congestion., Methods and Results: Patients (n = 5661) included in the PARADISE MI trial (Prospective ARNI vs. ACE Inhibitor Trial to Determine Superiority in Reducing Heart Failure Events After MI) were stratified according to MRA. Primary outcomes in this substudy were worsening heart failure or cardiovascular death. Safety was defined as symptomatic hypotension, hyperkalaemia >5.5 mmol/L, or permanent drug discontinuation. A total of 2338 patients (41%) were treated with MRA. Safety of ARNI compared to ramipril was not altered significantly by ± MRA, and both groups had similar increase in symptomatic hypotension with ARNI. In patients taking MRA, the risk of hyperkalaemia or permanent drug discontinuation was not significantly altered by ARNI (p > 0.05 for all comparisons). The effect of ARNI compared with ramipril was similar in those who were and were not taking MRA (hazard ratio [HR] MRA 0.96, 95% confidence interval [CI] 0.77-1.19 and HR MRA- 0.87, 95% CI 0.71-1.05, for the primary endpoint; p = 0.51 for interaction [Clinical Endpoint Committee adjudicated]); similar findings were observed if investigator-reported endpoints were evaluated (p = 0.61 for interaction)., Conclusions: Use of a MRA did not modify safety or clinical endpoints related to initiation of ARNI compared to ramipril in the post-MI setting in patients with LVSD and/or congestion., (© 2023 European Society of Cardiology.)

Introduction: Our model was conducted from Kuwaiti payer's perspective to provide evidence on the cost-effectiveness of Sodium zirconium cyclosilicate (SZC) versus patiromer to correct and maintain serum potassium (K+) in combination with renin-angiotensin-aldosterone system inhibitors (RAASis) with different dose titration in patients with chronic kidney disease/heart failure (CKD/HF) with/without renal replacement therapy (RRT)., Methodology: The model was developed as a patient-level, fixed-time increment stochastic simulation to simulate the complexity of disease, including multiple coexisting and competing conditional risks. This model was established to compare SZC versus patiromer as a treatment for hyperkalemia (HK) among adult populations with underlying conditions of advanced CKD stages 3a-5 or HF to correct and maintain serum K + over a lifetime horizon. The clinical outcomes of SZC and patiromer were demonstrated through arm-specific K + trajectories extracted from the HARMONIZE trial and OPAL-HK trial, respectively. The utility data was captured from different studies. Direct medical cost was captured from local data from Kuwaiti hospitals. Sensitivity analyses were conducted to assess the uncertainty in the model., Results: Within different scenarios of CKD/HF, SZC was a cost-saving option, with/without RRT, whether one-off administration or repeated administration, except for one-off treatment administration among the HF cohort, which generated an incremental cost effectiveness ratio of KWD 331/quality adjusted life year (QALY). The incremental QALY of SZC ranged from 0.007 to 0.202. In addition, the savings observed with SZC fall within a range of KWD -60 to KWD -1,235 at serum K+ ≥ 5.1 mmol/L., Conclusion: The evidence generated by our model recommends the inclusion of SZC as a treatment option to correct HK and maintain normal serum K + level for CKD/HF patients within the Kuwaiti healthcare system. The costs saved from reducing frequent HK episodes, RAASis discontinuation/down titration, major cardiovascular events, and hospitalization offset the drug acquisition cost of SZC.

Aims: Hyperkalemia often occurs among heart failure (HF) patients, particularly when treated with renin-angiotensin-aldosterone system inhibitors (RAASi). Even modest potassium levels variations raise the risk of mortality and prompt patients to discontinue disease-modifying treatment, as RAASi. Novel potassium binders (NPB), patiromer and sodium zirconium cyclosilicate, are effective in reducing potassium levels and are approved for the treatment of hyperkalemia in HF, but whether their use results in a real optimization of HF treatment remains to be seen. The aim of the present meta-analysis was to assess the efficacy of NPB on the optimization of RAASi therapy in HF patients., Methods and Results: PubMed, Web of Science and Clinicaltrial.gov were searched without restrictions from inception to 06 August 2022 to identify valuable articles. The studies that met the inclusion criteria were analyzed. The prespecified primary outcome was the optimization of RAASi therapy in HF patients, defined as the proportion of patients on RAASi at the end of follow-up. Secondary outcomes were hyperkalemia events, reduction in potassium levels, and adverse drugs reactions. Six studies with a total of 1390 patients were included. NPB improved RAASi therapy optimization in HF by 14% (95% CI: 4-26%), decreased hyperkalemia events by 29% (95% CI: 55-92%), and reduced potassium levels by 0.31 mEq/L (95% CI: 0.18-0.44) compared to placebo, maintaining a good safety profile., Conclusion: NPB are effective in allowing RAASi therapy optimization in patients affected by HF, in reducing hyperkalemia events and potassium levels., Systematic Review Registration: CRD42022351811 URL: https://www.crd.york.ac.uk/prospero/display&#95;record.php?RecordID=351811., Competing Interests: Declaration of Competing Interest None., (Copyright © 2023 The Author(s). Published by Elsevier B.V. All rights reserved.)

Background: Hyperkalemia is an electrolyte abnormality with potentially life-threatening consequences. Published data have shown that potassium-binding polymer patiromer (Veltassa) is associated with reduced rates of severe edema and hospitalization for heart failure compared with sodium zirconium cyclosilicate (SZC, Lokelma) when treating hyperkalemia. The aim of this study was to evaluate the possible costs associated with these interventions in the Spanish and UK settings., Methods: A cost-analysis model was developed in Microsoft Excel to compare the costs associated with patiromer and SZC for the management of hyperkalemia. Clinical event rates were taken from a published real-world comparative study, with the base case capturing the statistically significant reduction in severe edema with patiromer vs SZC and a sensitivity analysis also including the non-statistically significant reduction in hospitalization for heart failure. Country-specific costs, expressed in 2022 Euros (EUR) and British pounds sterling (GBP), were evaluated from a healthcare payer perspective and included pharmacy costs and costs of clinical events., Results: Patiromer may be associated with cost savings of EUR 107 and GBP 630 per patient-year of treatment vs SZC in Spain and the UK, respectively. The majority of cost savings were due to the possible lower daily cost of patiromer compared with SZC. Including the difference in heart failure hospitalization rates in a sensitivity analysis led to greater cost savings with patiromer over SZC, increasing to EUR 460 and GBP 902 in Spain and the UK, respectively. Extrapolation of patient-level economic outcomes to a population level found that patiromer was associated with annual cost savings of EUR 30.6 million in Spain, and GBP 801.7 million in the UK vs SZC., Conclusions: Patiromer has the potential to be cost saving vs SZC for the treatment of hyperkalemia in Spain and the UK based on the results of a real-world evidence analysis.

Background: Sodium zirconium cyclosilicate, a non-absorbed non-polymer zirconium silicate, is a new potassium binder for hyperkalemia. A previous report showed that administering sodium zirconium cyclosilicate to patients with hyperkalemia allows a higher continuation rate of renin-angiotensin-aldosterone system inhibitors. However, no studies have compared sodium zirconium cyclosilicate with existing potassium binders for renin-angiotensin-aldosterone system inhibitor continuity. The purpose of this study was to evaluate the effect of sodium zirconium cyclosilicate on angiotensin-converting enzyme inhibitor /angiotensin receptor blocker continuation in patients with hyperkalemia compared to that of calcium polystyrene sulfonate., Methods: Patients on angiotensin-converting enzyme inhibitors/angiotensin receptor blockers who were newly prescribed sodium zirconium cyclosilicate or calcium polystyrene sulfonate to treat hyperkalemia at a tertiary referral hospital between August 2020 and April 2022 were enrolled in this single-center, retrospective observational study. The primary outcome measure was angiotensin-converting enzyme inhibitor/angiotensin receptor blocker prescription three months after initiating potassium binders., Results: In total, 174 patients on angiotensin-converting enzyme inhibitors/angiotensin receptor blockers who were newly administered sodium zirconium cyclosilicate (n = 62) or calcium polystyrene sulfonate (n = 112) were analyzed. The prescription rate of angiotensin-converting enzyme inhibitors /angiotensin receptor blockers at 3 months was significantly higher in the sodium zirconium cyclosilicate group than in the calcium polystyrene sulfonate group (89 vs. 72%). Multivariate logistic regression models showed that sodium zirconium cyclosilicate was independently associated with the primary outcome (odds ratio 2.66, 95% confidence interval 1.05-7.43). The propensity score-matched comparison also showed a significant association between sodium zirconium cyclosilicate and the primary outcome., Conclusions: Our study suggests that administering sodium zirconium cyclosilicate to patients with hyperkalemia allows for a higher continuation rate of angiotensin-converting enzyme inhibitors/angiotensin receptor blockers than calcium polystyrene sulfonate. These findings suggest that sodium zirconium cyclosilicate has potential benefits for patients with chronic kidney disease receiving renin-angiotensin-aldosterone system inhibitors., (© 2023. The Author(s) under exclusive licence to Italian Society of Nephrology.)