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Background: Atrial fibrillation (AF) is a common comorbidity in patients with heart failure with preserved ejection fraction (HFpEF) and in heart failure with mildly reduced ejection fraction (HFmrEF)., Objectives: This study sought to describe AF burden and its clinical impact among individuals with HFpEF and HFmrEF who participated in a randomized clinical trial of atrial shunt therapy (REDUCE LAP-HF II [A Study to Evaluate the Corvia Medical, Inc IASD System II to Reduce Elevated Left Atrial Pressure in Patients with Heart Failure]) and to evaluate the effect of atrial shunt therapy on AF burden., Methods: Study investigators characterized AF burden among patients in the REDUCE LAP-HF II trial by using ambulatory cardiac patch monitoring at baseline (median patch wear time, 6 days) and over a 12-month follow-up (median patch wear time, 125 days). The investigators determined the association of baseline AF burden with long-term clinical events and examined the effect of atrial shunt therapy on AF burden over time., Results: Among 367 patients with cardiac monitoring data at baseline and follow-up, 194 (53%) had a history of AF or atrial flutter (AFL), and median baseline AF burden was 0.012% (IQR: 0%-1.3%). After multivariable adjustment, baseline AF burden ≥0.012% was significantly associated with heart failure (HF) events (HR: 2.00; 95% CI: 1.17-3.44; P = 0.01) both with and without a history of AF or AFL (P for interaction = 0.68). Adjustment for left atrial reservoir strain attenuated the baseline AF burden-HF event association (HR: 1.71; 95% CI: 0.93-3.14; P = 0.08). Of the 367 patients, 141 (38%) had patch-detected AF during follow-up without a history of AF or AFL. Atrial shunt therapy did not change AF incidence or burden during follow-up., Conclusions: In HFpEF and HFmrEF, nearly 40% of patients have subclinical AF by 1 year. Baseline AF burden, even at low levels, is associated with HF events. Atrial shunt therapy does not affect AF incidence or burden. (A Study to Evaluate the Corvia Medical, Inc IASD System II to Reduce Elevated Left Atrial Pressure in Patients with Heart Failure [REDUCE LAP-HF II]; NCT03088033)., Competing Interests: Funding Support and Author Disclosures Corvia Medical, Inc has provided funding for this work. Dr Reddy has served as a consultant to and has equity in Corvia Medical; also, unrelated to this manuscript, has served as a consultant to and has equity in Ablacon, Acutus Medical, Affera-Medtronic, Apama Medical-Boston Scientific, APN Health, Aquaheart, Atacor, Autonomix, Axon Therapies, Backbeat, BioSig, CardiaCare, CardioNXT/AFTx, Circa Scientific, CoRISMA, Dinova-Hangzhou Dinova EP Technology, East End Medical, EPD-Philips, EP Frontiers, Epix Therapeutics-Medtronic, EpiEP, Eximo, Farapulse-Boston Scientific, Field Medical, Focused Therapeutics, HRT, Intershunt, Javelin, Kardium, Keystone Heart, LuxMed, Medlumics, Middlepeak, Neutrace, Nuvera-Biosense Webster, Oracle Health, Restore Medical, Sirona Medical, SoundCath, and Valcare; unrelated to this work, has served as a consultant to Abbott, AtriAN, Biosense Webster, BioTel Heart, Biotronik, Boston Scientific, Cairdac, Cardiofocus, Cardionomic, CoreMap, Fire1, W.L. Gore & Associates, Impulse Dynamics, Medtronic, Philips, and Pulse Biosciences; and has equity in Manual Surgical Sciences, Newpace, Nyra Medical, Surecor, and Vizaramed. Dr Komtebedde has been employed by Corvia Medical, Inc. Dr Walton has served as a proctor for Medtronic, Edwards Lifesciences, and Abbott; has served on advisory boards for Medtronic, Abbott, and Edwards Lifesciences; and has received grant support from Medtronic, Abbott, and Edwards Lifesciences. Dr Herrmann has received institutional research grants from Abbott, Bayer, Boston Scientific, Edwards Lifesciences, Highlife, Medtronic, Shockwave, and W.L. Gore & Associates; has received consultant fees from Medtronic, W.L. Gore & Associates, and Corazon; and has equity in Holistic Medical and Microinterventional Devices. Dr Trochu received consulting fees from Bayer, Bristol-Myers-Squibb, Abbott, AstraZeneca, and Novartis; lecture fees from Boehringer-Ingelheim and Vifor; and congress sponsoring from Corvia. Dr Auricchio has served as a consultant to Boston Scientific, Cairdac, Corvia, Microport CRM, EPD Philips, EP Solution, Radcliffe Publishers, and XSpline; has received speaker fees from Boston Scientific, Medtronic, and Microport CRM; has participated in clinical trials sponsored by Boston Scientific, Medtronic, EPD Philips, XSpline; and has intellectual properties with Boston Scientific, Biosense Webster, and Microport CRM. Dr Shah has received research grants from the National Institutes of Health (U54 HL160273, R01 HL107577, R01 HL127028, R01 HL140731, R01 HL149423), Actelion, AstraZeneca, Corvia, Novartis, and Pfizer; and has received consulting fees from Abbott, Actelion, AstraZeneca, Amgen, Aria CV, Axon Therapies, Bayer, Boehringer Ingelheim, Boston Scientific, Bristol-Myers Squibb, Cardiora, Coridea, CVRx, Cyclerion, Cytokinetics, Edwards Lifesciences, Eidos, Eisai, Imara, Impulse Dynamics, GlaxoSmithKline, Intellia, Ionis, Ironwood, Lilly, Merck, MyoKardia, Novartis, Novo Nordisk, Pfizer, Prothena, Regeneron, Rivus, Sanofi, Sardocor, Shifamed, Tenax, Tenaya, and United Therapeutics. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose., (Copyright © 2023 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.)