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In this study, the authors investigated the ablation success of scar homogenization with combined (epicardial + endocardial) vs endocardial-only approach for ventricular tachycardia (VT) in patients with ischemic cardiomyopathy (ICM) at 5 years of follow-up.Best ablation approach to achieve long-term success rate in VT patients with ICM is not known yet.Consecutive ICM patients undergoing VT ablation at our center were classified into group 1: endocardial + epicardial scar homogenization and group 2: endocardial scar homogenization. Patients with previous open heart surgery were excluded. Epicardial ablation was performed despite being noninducible after endocardial ablation in all group 1 patients. All patients underwent bipolar substrate mapping with standard scar settings defined as normal tissue1.5 mV and severe scar 0.5 mV. Noninducibility of monomorphic VT was the procedural endpoint in both groups. Patients were followed up every 4 months for 5 years with implantable device interrogations.A total of 361 patients (group 1: n = 70 and group 2: n = 291) were included in the study. At 5 years, 81.4% (n = 57/70) patients from group 1 and 66.3% (n = 193/291) from group 2 were arrhythmia-free (P = 0.01) Of those patients, 26 of 57 (45.6%) and 172 of 193 (89.1%) from group 1 and group 2 respectively were on anti-arrhythmic drugs (AAD) (log-rank P0.001). After adjusting for age, sex, and obstructive sleep apnea, endo-epicardial scar homogenization was associated with a significant reduction in arrhythmia-recurrence (HR: 0.48; 95% CI: 0.27-0.86; P = 0.02).In this series of patients with ICM and VT, epicardial substrate was detected in all group 1 patients despite being noninducible after endocardial ablation. Moreover, combined endo-epicardial scar homogenization was associated with a significantly higher success rate at 5 years of follow-up and a substantially lower need for antiarrhythmic drugs after the procedure compared with the endocardial ablation alone.

AimsThis study aimed to examine the clinical benefits of targeted ablation of all Premature ventricular complex (PVC) morphologies vs. predominant PVC only.Methods and resultsA total of 171 consecutive patients with reduced left ventricular ejection fraction (LVEF) and ≥2 PVC morphology with high burden (>10%/day) undergoing their first ablation procedure were included in the analysis. At the initial procedure, prevalent PVC alone was ablated in the majority. However, at the redo, all PVC morphologies were targeted for ablation. : At the first procedure, 152 (89%) patients received ablation of the dominant PVC only. In the remaining 19 (11%) patients, all PVC morphologies were ablated. At two years, high PVC burden was detected in 89 (52%) patients. Repeat procedure was performed in 78 of 89, where all PVC morphologies were ablated. At 5 years after the repeat procedure, 71 (91%) had PVC burden of ConclusionIn this observational series, ablation of all PVC morphologies was associated with significantly lower PVC burden and improvement of LVEF at long-term follow-up, compared with ablation of the dominant morphology only.

Aims Cardiac computed tomography (CT) is increasingly utilized during follow-up after left atrial appendage closure (LAAC). Hypoattenuated thickening (HAT) is a common finding and might represent either benign device healing or device-related thrombosis (DRT). The appearance and characteristics of HAT associated with the Watchman FLX have not been previously described. Therefore, we sought to investigate cardiac CT findings during follow-up after Watchman FLX implantation with a focus on HAT and DRT. Methods and results Retrospective single-centre, observational study including all patients with successful Watchman FLX implantation and follow-up cardiac CT between March 2019 and September 2021 (n = 244). Blinded analysis of CT images was performed describing the localization, extent, and morphology of HAT and correlated to imaging and histology findings in a canine model. Relevant clinical and preclinical ethical approvals were obtained. Overall, HAT was present in 156 cases (64%) and could be classified as either subfabric hypoattenuation (n = 59), flat sessile HAT (n = 78), protruding sessile HAT (n = 16), or pedunculated HAT (n = 3). All cases of pedunculated HAT and five cases of protruding sessile HAT were considered as high-grade HAT (n = 7). Subfabric hypoattenuation and flat sessile HAT correlated with device healing and endothelialization in histological analysis of explanted devices. Conclusion Subfabric hypoattenuation and flat sessile HAT are frequent CT findings for Watchman FLX, likely representing benign device healing and endothelialization. Pedunculated HAT and protruding HAT are infrequent CT findings that might represent DRT.

BACKGROUND: Residual peri-device leakage (PDL) is frequent after left atrial appendage occlusion (LAAO). Little is known about management strategies, procedural aspects and outcomes of interventional PDL closure.AIMS: The aim of this study was to assess the safety and feasibility of PDL closure after LAAO.METHODS: Fifteen centres contributed data on baseline characteristics, in-hospital and follow-up outcomes of patients who underwent PDL closure after LAAO. Outcomes of interest included acute success and complication rates and long-term efficacy of the procedure.RESULTS: A total of 95 patients were included and a cumulative number of 104 leaks were closed. The majority of PDLs were detected within 90 days (range 41-231). Detachable coils were the most frequent approach (42.3%), followed by the use of the AMPLATZER Vascular Plug II (29.8%) and the AMPLATZER Duct Occluder II (17.3%). Technical success was 100% with 94.2% of devices placed successfully within the first attempt. There were no major complications requiring surgical or transcatheter interventions. During follow-up (96 days [range 49-526]), persistent leaks were found in 18 patients (18.9%), yielding a functional success rate of 82.7%, although PDLs were significantly reduced in size (pre-leak sizemax: 6.1±3.6 mm vs post-leak sizemax: 2.5±1.3 mm, p5 mm. Major adverse events during follow-up occurred in 5 patients (2 ischaemic strokes, 2 intracranial haemorrhages, and 1 major gastrointestinal bleeding).CONCLUSIONS: Several interventional techniques have become available to achieve PDL closure. They are associated with high technical and functional success and low complication rates.

Objectives The aim of this study was to evaluate the efficacy of radiofrequency (RF) energy applications targeting the atrial side of a significant residual leak in patients with acute and chronic evidence of incomplete percutaneous left atrial appendage (LAA) occlusion. Background RF applications have been proved to prevent recanalization of intracranial aneurysms after coil embolization, thereby favoring complete sealing. From a mechanistic standpoint, in vitro and in vivo experiments have demonstrated that RF promotes collagen deposition and tissue retraction. Methods Forty-three patients (mean age 75 ± 7 years mean CHA2DS2-VASc score 4.6 ± 1.4, mean HAS-BLED score 4.0 ± 1.1) with residual leaks ≥4 mm after Watchman implantation were enrolled. Procedural success was defined as complete LAA occlusion or presence of a mild or minimal (1- to 2-mm) peridevice leak on follow-up transesophageal echocardiography (TEE), which was performed approximately 45 days after the procedure. Results RF-based leak closure was performed acutely after Watchman implantation in 19 patients (44.2%) or scheduled after evidence of significant leaks on follow-up TEE in 24 others (55.8%). The median leak size was 5 mm (range: 4-7 mm). On average, 18 ± 7 RF applications per patient (mean maximum contact force 16 ± 3 g, mean power 44 ± 2 W, mean RF time 5.1 ± 2.5 minutes) were performed targeting the atrial edge of the leak. Post-RF median leak size was 0 mm (range: 0-1 mm). A very low rate (2.3% [n = 1]) of major periprocedural complications was observed. Follow-up TEE revealed complete LAA sealing in 23 patients (53.5%) and negligible residual leaks in 15 (34.9%). Conclusions RF applications targeting the atrial edge of a significant peri-Watchman leak may promote LAA sealing via tissue remodeling, without increasing complications. (RF Applications for Residual LAA Leaks [REACT]; NCT04726943 )

Objectives This study evaluated the long-term efficacy of a standard antithrombotic strategy versus half-dose direct oral anticoagulation (DOAC) after Watchman implantation. Background No consensus currently exists on the selection of the most effective antithrombotic strategy to prevent device-related thrombosis (DRT) in patients undergoing endocardial left atrial appendage closure. Methods After successful left atrial appendage closure, consecutive patients were prescribed a standard antithrombotic strategy (SAT) or long-term half-dose DOAC (hdDOAC). The primary composite endpoint was DRT and thromboembolic (TE) and bleeding events. Results Overall, 555 patients (mean age 75 ± 8 years, 63% male; median CHA2DS2-VASc [congestive heart failure, hypertension, age ≥75 years, diabetes mellitus, prior stroke or transient ischemic attack or thromboembolism, vascular disease, age 65-74 years, sex category] score 4 [interquartile range (IQR): 3-6]; median HAS-BLED [hypertension, abnormal renal or liver function, stroke, bleeding, labile international normalized ratio, elderly, drugs or alcohol] score 3 [IQR: 2-4]) were included. Patients were categorized into 2 groups (SAT: n = 357 vs hdDOAC: n = 198). Baseline clinical characteristics were similar between groups. The median follow-up duration was 13 months (IQR: 12-15 months). DRT occurred in 12 (2.1%) patients, all in the SAT group (3.4% vs 0.0%; log-rank P = 0.009). The risk of nonprocedural major bleeding was significantly more favorable in the hdDOAC group (0.5% vs. 3.9%; log-rank P = 0.018). The rate of the primary composite endpoint of DRT and TE and major bleeding events was 9.5% in SAT patients and 1.0% in hdDOAC patients (HR: 9.8; 95% CI: 2.3-40.7; P = 0.002). Conclusions After successful Watchman implantation, long-term half-dose DOAC significantly reduced the risk of the composite endpoint of DRT and TE and major bleeding events compared with a standard, antiplatelet-based, antithrombotic therapy.

Atrial fibrillation (AF) and premature ventricular complexes (PVC) are common arrhythmias. We aimed to investigate AF prevalence in patients with PVC and its impact on PVC ablation outcomes.Consecutive patients undergoing PVC ablation at a single institution between 2016 and 2019 were included and prospectively followed for 2 years. Patients with severe valvular heart disease, hyperthyroidism, malignancy, alcohol use disorder and advanced renal/hepatic diseases were excluded. Twelve-lead electrocardiograms were used to diagnose AF and assess PVC morphology. All PVCs were targeted for ablation using 4-mm irrigated-tip catheters at standardized radiofrequency power guided by 3-D mapping and intracardiac echocardiography. Patients were followed with remote monitoring, device interrogations and office visits every 6 months for 2 years. Detection of any PVCs in follow-up was considered as recurrence.A total of 394 patients underwent PVC ablation and 96 (24%) had concurrent AF. Patients with PVC and AF were significantly older (68.2 ± 10.8 vs. 58.3 ± 15.8 years, p .001), had lower LV ejection fraction (43.3 ± 13.3% vs. 49.6 ± 12.4%, p .001), higher CHAAF was documented in 1/4 of patients undergoing PVC ablation and was associated with lower procedural success at long-term follow-up. This was likely attributed to older age, worse LV function and higher prevalence of multiple PVC morphologies in patients with concurrent AF.

Introduction Watchman FLX has been recently approved for left atrial appendage occlusion (LAAO) in the US. Intracardiac echocardiography (ICE) - which is already commonly used to guide trans-septal access - can serve as an alternative to TEE, simplifying the procedure and reducing associated costs. Herein, we report our experience with ICE-guided LAAO with Watchman FLX. Methods and results This cohort study included the first 190 consecutive patients who underwent LAAO with Watchman FLX in our center. LAAO was successful in all patients without significant peri-procedural, device-related complications in either group. Compared to TEE, we observed a significant reduction in procedural times when using ICE. In addition, there was a potentially clinically relevant reduction in fluoroscopy dose, mainly secondary to fewer cine acquisition runs. At follow-up, no cases of device embolism were noted, whereas the rate of device-related thrombosis and peri-device leaks were comparable between groups. Conclusion ICE-guided LAAO with Watchman FLX is safe and feasible, with a significant reduction in procedural time and potential reduction in fluoroscopy dose when compared to TEE.

We describe a case of pacemaker implant guided by intracardiac echocardiography and three-dimensional anatomical mapping in a pregnant patient, with no peri-procedural use of radiation.

Intracardiac echocardiography (ICE) is a valuable tool and should be standard of care in any modern electrophysiology laboratory. Through real-time imaging of cardiac anatomy, ICE is used to guide electrophysiology procedures and monitor for complications. This article is a short overview of the application of real-time ICE imaging during atrial fibrillation ablation procedures.

Background: Left atrial appendage (LAA) occlusion provides an alternative to oral anticoagulation for thromboembolic risk reduction in patients with nonvalvular atrial fibrillation. Since regulatory approval in 2015, the WATCHMAN device has been the only LAA closure device available for clinical use in the United States. The PINNACLE FLX study (Protection Against Embolism for Nonvalvular AF Patients: Investigational Device Evaluation of the Watchman FLX LAA Closure Technology) evaluated the safety and effectiveness of the next-generation WATCHMAN FLX LAA closure device in patients with nonvalvular atrial fibrillation in whom oral anticoagulation is indicated, but who have an appropriate rationale to seek a nonpharmaceutical alternative. Methods: This was a prospective, nonrandomized, multicenter US Food and Drug Administration study. The primary safety end point was the occurrence of one of the following events within 7 days after the procedure or by hospital discharge, whichever was later: death, ischemic stroke, systemic embolism, or device- or procedure-related events requiring cardiac surgery. The primary effectiveness end point was the incidence of effective LAA closure (peri-device flow ≤5 mm), as assessed by the echocardiography core laboratory at 12-month follow-up. Results: A total of 400 patients were enrolled. The mean age was 73.8±8.6 years and the mean CHA 2 DS 2 -VASc score was 4.2±1.5. The incidence of the primary safety end point was 0.5% with a 1-sided 95% upper CI of 1.6%, meeting the performance goal of 4.2% ( P P Conclusions: LAA closure with this next-generation LAA closure device was associated with a low incidence of adverse events and a high incidence of anatomic closure. Registration: URL: https://www.clinicaltrials.gov ; Unique identifier: NCT02702271.

Objectives This study evaluated the association of the post-ablation scar with stroke risk in patients undergoing atrial fibrillation (AF) ablation. Background Late gadolinium enhancement–...

Background The creation of effective and permanent lesions is a crucial factor in determining the success rate of atrial fibrillation (AF) ablation. By increasing the efficacy of radiofrequency (RF) energy-mediated lesion formation, half-normal saline (HNS) as an irrigant for open-irrigated ablation catheters has the potential to reduce procedural times and improve acute and long-term outcomes. Methods This is a double-blind randomized clinical trial of 99 patients undergoing first-time RF catheter ablation for AF. Patients enrolled were randomly assigned in a 1:1 fashion to perform ablation using HNS or normal saline (NS) as an irrigant for the ablation catheter. Results The use of HNS is associated with shorter RF times (26 vs. 33 min; p = .02) with comparable procedure times (104 vs. 104 min). The rate of acute pulmonary vein reconnections (16% vs. 18%) was comparable, with a median of 1 vein reconnection in the HNS arm versus 2 in the NS arm. There was no difference in procedure-related complications, including the incidence of postprocedural hyponatremia when using HNS. Over the 1-year follow-up, there is no significant difference between the HNS and NS with respect to the recurrence of any atrial arrhythmia (off antiarrhythmic drugs [AAD]: 47% vs. 52%; hazard ratio [HR]: 1.17, 95% confidence interval [CI]: 0.66-2.06; off/on AAD: 66% vs. 66%, HR: 1.06, 95% CI: 0.53-2.12), with a potential benefit of using HNS when considering the paroxysmal AF cohort (on/off AAD 73% vs. 62%, HR: 0.72, 95% CI: 0.19-2.70). Conclusions In a mixed cohort of patients undergoing first-time AF ablation, irrigation of open-irrigated RF ablation catheters with HNS is associated with shorter RF times, with a comparably low rate of procedure-related complications. In the long term, there is no significant difference with respect to the recurrence of any atrial arrhythmia. Larger studies with a more homogeneous population are necessary to determine whether HNS improves clinical outcomes.

Background Thromboembolic stroke is a rare but devastating consequence of atrial fibrillation (AF) ablation. Transesopheageal echocardiography (TEE) is recommended to rule out left atrial appendage thrombus (LAA); however, its utilization is variable. Objective To assess whether TEE is mandatory in patients undergoing AF ablation on uninterrupted DOACs. Methods Data from our prospective, multicenter registry of AF patients undergoing radiofrequency catheter ablation on uninterrupted DOACs was analyzed. All included patients were on anticoagulation for at least four-weeks before ablation. All AF ablation procedures were performed under ICE guidance. Prior to transseptal puncture, heparin bolus was administered, followed by continuous infusion, with target activated clotting time over 300 seconds. Results A total of 6186 patients [3180 (51.4%): apixaban, 2528 (40.9%): rivaroxaban, 404 (6.5%): dabigatran, and 74 (1.2%): edoxaban] were analyzed. The mean age of the study population was 69.4 ± 10.3 years, of which 4194 (67.8%) patients were male and 5120 (82.8%) patients had persistent and long-standing persistent AF. The mean CHA2DS2-VASc score was 2.86 ± 1.58; the mean CHADS2 score was 1.65 ± 1.14. ICE ruled out LAA and LA thrombus in all patients and revealed ‘smoke’ in 1672 (27.03%) patients. Transient ischemic attack was noted in one patient with long-standing persistent AF, in the setting of a missed dose of rivaroxaban prior to ablation. Conclusion Our study showed that performance of AF ablation in patients on uninterrupted DOACs without TEE is safe and feasible in high stroke-risk patients. Elimination of routine pre-ablation TEE would have significant economic and clinical implications.

The percutaneous epicardial approach has become an adjunctive tool for electrophysiologists to treat disparate cardiac arrhythmias, including accessory pathways, atrial tachycardia, and particularly ventricular tachycardia. This novel technique prompted a strong impulse to perform epicardial access as an alternative strategy for pacing and defibrillation, left atrial appendage exclusion, heart failure with preserved ejection fraction, and genetically engineered tissue delivery. However, because of the incremental risk of major complications compared with stand-alone endocardial ablation, it is still practiced in a limited number of highly experienced centers across the world.

BACKGROUND We evaluated the efficacy of a new method in identifying peri-device leak (PDL) using morphology of the thrombus formed inside the left atrial appendage (LAA) as seen on follow-up transesophageal echo (TEE). METHOD A total of 291 consecutive patients undergoing Watchman procedure were included in this analysis. TEE was performed at 45 days postprocedure. Based on the presence of the thrombus inside the LAA behind the device, patients were grouped as (1) white (W) group: LAA completely filled with thrombus (n = 101), 2) nonwhite (NW) group: LAA completely black or mixed (part black and part white; n = 190). Follow-up TEE was repeated at 6 and 12 months. RESULTS Baseline characteristics were comparable between groups except the device size, number of patients with chicken-wing morphology, and prevalence of left atrial "smoke" that were significantly higher in the NW group. Detection of black appearance was comparable between the pre-coil closure image and the NW population (26/36 [72.2%] vs 99/154 [64.3%], p = .37). After adjusting for clinically relevant covariates, NW appearance of the LAA was associated with the presence of significant leak (odds ratio: 47.96, 95% confidence interval: 2.91-790.2, p

Rhythm control of persistent atrial fibrillation (AF) patients represents a challenge for the modern interventional cardiac electrophysiologist; as a matter of fact, there is still divergence regarding the best ablative approach to adopt in this population. Different investigational endpoints, variability of techniques and tools, significant technological evolution, and the lack of universally accepted pathophysiological models engendered a considerable heterogeneity in terms of techniques and outcomes, so much that the treatment of persistent subtypes of AF commonly still relies mainly on pulmonary vein (PV) isolation. The purpose of the present review is to report the current experimental and clinical evidence supporting the importance of mapping and ablating non-PV triggers and describe our institutional approach for the ablation of nonparoxysmal AF.

Closure of the left atrial appendage (LAA) using percutaneous transcatheter occlusion devices is used for stroke prevention as an alternative for patients with a high risk and contraindications for long-term oral anticoagulation use. In this manuscript, we will discuss the practical aspects of four among the available devices that provide percutaneous intravascular closure of the LAA: Watchman, Amulet, WaveCrest, and LAmbre.

Background The RADIANCE first-in-man study evaluated acute (3-month) safety and design concept in terms of utility of a new multi-electrode radiofrequency (RF) balloon catheter (HELIOSTAR, Biosense Webster) to achieve pulmonary vein isolation (PVI). After study conclusion, a subset of patients was followed up to 12 months. Methods Patients with drug refractory paroxysmal atrial fibrillation were enrolled. Neurological assessment, cardiac and cerebral magnetic resonance imagings were performed pre and post procedure. Ablation was delivered at 15 Watts to each PV for 60 seconds (electrodes adjacent to the posterior wall limited to 20 seconds). Adenosine or isoproterenol was administered to confirm PVI. Esophageal endoscopy was performed 48 hours post procedure. Patients were clinically followed up for 12 months. Results Thirty-nine patients underwent catheter ablation from four centers. Mean age was 60.7 ± 10.0 years with 23 (57.5%) being male. Confirmation of PVI was performed in all PVs treated (152/152). Confirmation of isolation after one delivery was performed solely on 137 of 152 PVs of which 79.6% (109/137) achieved isolation with a single delivery of RF energy. Acute PV reconnection was seen in 4.6% (7/150) of PVs. Freedom from documented atrial arrhythmia at 12 months in those followed up was 86.4% (32/37). A total of 75.7% (28/37) of patients were free from atrial arrhythmia and off antiarrhythmic medications. Conclusion The HELIOSTAR RF balloon catheter allows for rapid and safe PVI with majority of PVs only requiring one application.

Objectives This study aimed to investigate the feasibility and safety of left atrial appendage occlusion (LAAO) procedures in patients with persistent left atrial appendage (LAA) thrombus. Background The left atrial appendage (LAA) is the most common site of thrombus formation in patients with nonvalvular atrial fibrillation (AF). Oral anticoagulation (OAC) is used to prevent and treat AF-related thrombus. However, a significant proportion of patients may not be eligible for long-term OAC therapy. In many cases, OAC may fail to resolve the thrombus. Left atrial appendage occlusion (LAAO) may be a potential option in such cases. Major LAAO studies have excluded patients with LAA thrombus, and it is not known whether LAAO procedures in the presence of LAA thrombus is feasible and safe. Methods This was a systematic review of patient-level data of all published cases of LAAO in the presence of LAA thrombus. Results There was a total of 58 patients included in the study. Most of the patients had a distally located thrombus in the LAA. All cases underwent successful implantation of LAAO devices with some procedural modifications. Amulet was the most commonly used device (50%). A cerebral protection device was used in 17 (29%) patients, and procedural transesophageal echocardiography was used in most of the cases. One stroke (1.7%) and 2 (3.4%) device-related thromboses were noted during the mean follow-up of 3.4 ± 7 months. Conclusions Percutaneous LAAO procedures appear to be feasible in patients with a distally located persistent LAA thrombus when performed by experienced operators with some technical modifications. Further studies are required to determine the long-term safety and efficacy of this approach.

Incomplete left atrial appendage (LAA) closure is an evolving topic of clinical significance and thromboembolic potential, with recent long-term studies suggesting lower cutoffs for relevant leak size.The aim of this prospective observational study was to assess 3 different closure techniques for persistent peridevice leaks after incomplete LAA closure and compare their efficacy and safety outcomes.We studied 160 patients (mean age 72 ± 9 years; 71% men) who underwent 1 of the 3 available modalities (detachable embolization coils, vascular plugs or septal occluders, and radiofrequency ablation) for residual central or eccentric leak closure. Both acute postprocedural success (closure or 1-mm leak at the end of the procedure) and closure at 1-year follow-up transesophageal echocardiography imaging were evaluated.Of 160 patients, 0.6%, 41.3%, and 58.1% had mild (1-2 mm), moderate (3-5 mm), and severe (≥5 mm) leaks, respectively. Baseline LAA closure type was 72.5% Watchman FLX, 16.3% Lariat, 5.6% surgical ligation, 1.9% AtriClip, and 1.9% Amulet. Successful closure (0- or 1-mm leak) was seen in 100% of patients in all cohorts following intervention, with overall complete closure (0-1 mm) or mild or minimal leaks (1-2 mm) on 1-year follow-up transesophageal echocardiography seen in 100% of the atrial septal occluder or vascular plug cohort, 85.9% of the coil cohort, and 83.3% of the radiofrequency ablation cohort (P 0.001). Two patients (1.3%) experienced cardiac tamponade, and there were no deaths or other complications.Peridevice leaks can safely and effectively be closed using 3 different modalities depending on size and location.

Herein, we describe the use of an Amplatzer PFO Occluder to treat incomplete LAA closure due to a malpositioned AtriClip.

Introduction: Left atrial (LA) scar, identified by bipolar voltage mapping, is a frequent finding in patients with non-paroxysmal atrial fibrillation (NPAF). We evaluated the most common sites of scar formation in the LA in a series of NPAF patients. Methods: Consecutive NPAF patients undergoing their first catheter ablation at our center were included in this analysis. Voltage mapping was performed in sinus rhythm (SR) using a 3D electro-anatomic mapping system and a 10-pole circular mapping catheter. The LA was divided into following regions: septum, posterior wall, lateral wall, anterior wall and roof. The threshold for low voltage was Results: A total of 359 NPAF (224, 62.4% persistent AF) patients undergoing their first ablation procedure with voltage mapping performed in SR were included in this study. Mean number of points taken to map the scar was 281.2±96.3. Low voltage area was detected in 209/359 (58%) cases; 108 (48.62%) persistent AF, 101(74.8%) long-standing persistent AF, p Conclusion: In the NPAF population, LA scar was detected in significantly less number of persistent AF patients. Scars were mostly located in the posterior wall of left atrium followed by the antero-septum region. Characterization of the LA scars would be helpful in optimizing the ablation targets.

Introduction: Scar-related VT is common in post-MI patients. We evaluated the benefits of remapping with the multi-electrode catheter after acute success was achieved with the single-point ablation catheter in post-MI VT patients undergoing catheter ablation. Methods: Consecutive post-MI patients undergoing VT ablation were included. 3-D electroanatomic maps were obtained in sinus rhythm and/or during hemodynamically-stable VT with the multi-electrode PentaRay catheter. All underwent substrate mapping with standard scar settings (≤ 1.5 mV). Ablation was performed with the single-point ablation catheter and acute success was defined as non-inducibility of all VT at the end of the procedure. After acute success was achieved, some operators remapped with the PentaRay catheter to identify residual abnormal potentials. Results: A total of 121 patients (table) undergoing VT ablation were prospectively analyzed. Acute success was achieved in 117 (96.6%) cases. Remapping with the PentaRay catheter was performed in 102 (84.3%) cases. Few sites with delayed potentials were detected in 66/102 (61%) cases. These sites were targeted for further ablation. At 1 year follow-up, 76/102 (74.5%) of the remap population and 14/19 (73.6%) patients from the no-remap group remained arrhythmia-free off-AAD (p=NS). Conclusion: In our series, detection of few sites with late potentials by remapping with the multi-electrode catheter, after achieving acute success with single-point ablation did not improve the success rate at 1 year. Thus, the clinical benefits of remapping with multi-electrode catheters is not clear in VT patients undergoing substrate-based catheter ablation.

Introduction: Intramural PVCs are identified by equal but not remarkably early activation on at least two separate sites. The site of origin of these foci is typically determined by a deductive approach using extensive mapping in the surrounding areas. Ablation of the intramural VT is particularly challenging, since conventional ablation strategies often fail to obtain transmural lesion formation. We report the long-term success rate of ablation of the intramural PVCs at our center. Methods: Consecutive patients undergoing VT ablation at our center were screened and 73 patients with intramural PVCs identified by activation mapping and pace mapping were included in the analysis. Pace-mapping was performed at a pacing cycle length equal to the coupling interval of the spontaneous PVCs. If these PVCs could not be eliminated by conventional ablation, bipolar ablation or ablation from multiple sides or ablation using half-normal saline (HNS) was performed. Standardized RF power settings (up to 40W) were used during the procedure. Ablation was performed using 4-mm irrigated tip catheter guided by 3-D mapping system and intra-cardiac echocardiography. Patients were followed with remote monitoring as well as ICD interrogations and office visits every 3 months for 3 years. Results: A total of 73 patients were included in the analysis (mean age 56.2±8.6 years, 69.8% male, LVEF 54±12%). The intramural focus was effectively ablated by bipolar ablation or ablation from multiple sides in 51 (69.8%) and with the use of HNS in the remaining 22 patients. Median RF time was 11.14±8.7 minutes. Acute success (non-inducibility of the VT) was achieved in 71 (97.2%) patients. At 3 years follow-up, 66 (90.4%) remained arrhythmia-free. Conclusion: Intramural PVCs could be successfully ablated using bipolar or multiple-side ablations or utilizing half-normal saline with high long-term success rate.

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the authors. The authors inadvertently specified some ablation settings in the methods section that should not have been reported because they can be potentially linked to a specific pulsed field ablation technology that is currently under investigation for FDA approval. The Authors apologize for the inconvenience caused by this oversightinsert 'Reason' text (to be provided by the Editor-in-Chief or written by the Publisher and approved by the Editor-in-Chief and then approved by the RR panel). In case of (suspected) plagiarism, it is mandatory to refer to the plagiarized work here byAbbreviated Journal Title, volume (year) first page - last page, http://dx.doi.org/DOI of plagiarized work (in URL format) coded as inter-ref if possible.

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the authors. The authors inadvertently specified some ablation settings in the methods section that should not have been reported because they can be potentially linked to a specific pulsed field ablation technology that is currently under investigation for FDA approval. The Authors apologize for the inconvenience caused by this oversightinsert 'Reason' text (to be provided by the Editor-in-Chief or written by the Publisher and approved by the Editor-in-Chief and then approved by the RR panel). In case of (suspected) plagiarism, it is mandatory to refer to the plagiarized work here byAbbreviated Journal Title, volume (year) first page - last page, http://dx.doi.org/DOI of plagiarized work (in URL format) coded as inter-ref if possible.

Background Radiofrequency catheter ablation, a widely recognized therapeutic option for atrial fibrillation (AF) has limited success rate as it is influenced by several factors including duration of AF. Purpose We evaluated the ablation success in AF patients intervened early versus late in the disease course. Methods Consecutive AF patients undergoing their first catheter ablation in 2015–16 at our center were included in the analysis. Patients were classified into two groups based on the time to ablation after AF diagnosis; 1) early: ≤12 months and 2) late: >12 months. All received PV isolation plus isolation of posterior wall and superior vena cava. Additionally, in non-paroxysmal AF cases, non-PV triggers were identified with isoproterenol-challenge and ablated. Patients were prospectively followed up for 3 years with regular rhythm monitoring. Results A total of 752 and 1248 patients were included in the “early” and “late” group respectively. Baseline characteristics of the study population is provided in Table 1 A. At 4 years of follow-up, overall success rate off-antiarrhythmic drugs was significantly higher in the “early” group (65.4% vs 57%, p Conclusion In this large series with standardized ablation strategy, early intervention with catheter ablation was associated with higher success rate in all AF types. Funding Acknowledgement Type of funding sources: None. Table 1

Introduction This study evaluated the prevalent triggers responsible for recurrence following successful PVI in different types of atrial fibrillation (AF). Methods Consecutive AF patients undergoing repeat catheter ablation with permanently isolated PV were included in the analysis. High-dose isoproterenol challenge (20- 30μg/min for 15–20min) was used to confirm PV reconnection and identify non-PV triggers. Circular mapping catheter (CMC) was used to map the site of origin of significant ectopic activity by comparing the activation sequence of the sinus beat with that of the ectopic beat. For the coronary sinus (CS), ablation catheter was positioned at the level of the mitral valve annulus, parallel to the one positioned in the CS. Left atrial appendage (LAA) firing was detected by placing the CMC in the left superior PV and thus recording far-field potentials from the LAA. Results This prospective study included 1850 AF patients undergoing repeat AF ablation (Table 1), of which 573 (31%) had received one and the remaining 1277 patients had received 2 earlier ablations. Permanent PVI was confirmed with isoproterenol challenge. Table 1 shows the distribution of non-PV triggers. A linear increase in the number of non-PV triggers was observed from PAF to PerAF to LSPAF. Significantly higher number of LSPAF patients had detectable non-PV triggers compared to PerAF and PAF cases. Conclusion We observed a linear increase in the number of non-PV triggers in PAF to PerAF and LSPAF patients experiencing recurrence with successful isolation of PVs. As non-PV triggers are often not targeted by operators, this could be the underlying mechanism for more frequent recurrences in non-paroxysmal AF. Funding Acknowledgement Type of funding sources: None. Table 1

Introduction We investigated the ablation success of scar homogenization with combined (epicardial + endocardial) versus endocardial-only approach for ventricular tachycardia (VT) in patients with ischemic cardiomyopathy (ICM) at 5 years of follow-up. Method Consecutive ICM patients undergoing VT ablation at our center were classified into group 1: endocardial scar homogenization and group 2: endocardial +epicardial scar homogenization. Patients with previous open heart surgery were excluded. All patients underwent bipolar substrate mapping with standard scar settings defined as normal tissue >1.5 mV and severe scar Results A total of 361 (Group 1: 291 and group 2: 70) patients were included in the study (mean age: 67 years, male: 88.4%). At 5 years, significantly higher number of patients from group 2 remained arrhythmia-free (figure 1). Of those patients, 87 (45%) and 51 (89%) from group 1 and 2 respectively were off-anti-arrhythmic drugs (AAD) (p Conclusion In this series of patients with ischemic cardiomyopathy and VT, endo-epicardial scar homogenization was associated with a lower need for AAD and a significantly lower recurrence rate at 5-years of follow-up compared to the endocardial ablation alone. Funding Acknowledgement Type of funding sources: None. Figure 1

Introduction High-power short-duration (HPSD) ablation is currently being adopted by many as the preferred procedural technique in atrial fibrillation (AF). However, the optimal duration of energy delivery to successfully create a durable lesion is not clear yet. Purpose We evaluated the association of electrical reconnection with lesion-duration in HPSD ablation. Methods Consecutive AF patients undergoing repeat procedure after a prior HPSD ablation with or without isolation of left atrial appendage (LAA) and coronary sinus (CS) were included in this analysis. HPSD ablation was defined as ablation with maximum temperature setting at 420C and power delivery at 45 W for 10–15 sec (5 seconds in the CS area and posterior wall near the esophagus). In some patients a mechanical esophageal deviation tool was used to deflect the esophagus away from the ablation site. Results A total of 2249 AF patients (with LAA and CS isolation: 1451; without LAA and CS isolation: 798) receiving redo ablation after a prior HPSD procedure were included in the analysis. At the prior procedure with the HPSD approach, mean duration of ablation was significantly shorter in the area facing the esophagus compared to elsewhere (5.2±1.5 vs 12.5±1.7 seconds, p At the redo, recovery of conduction was noted in the CS (592, 40.8%), LAA (493, 34%), and PV and left atrial posterior wall (LAPW) (310, 13.8%). Of the 310 patients with LAPW reconnection, 91% (n=282) had the conduction recovered in the area facing the esophagus. In 73 patients, esophageal displacement device was used during the prior HPSD ablation. Average duration of ablation lesions in LAPW among those 73 patients was 9.2±2 seconds. PV-LAPW reconnection was observed in 3/73 (4.1%) patients. Conclusion HPSD ablation with lesion duration of Funding Acknowledgement Type of funding sources: None.

Introduction Pulmonary vein isolation (PVI) is the cornerstone of ablative therapy in atrial fibrillation (AF). However, the one-year success rate after single ablation procedure is known to be up to 60%, necessitating repeat procedures in many. Purpose We evaluated the impact of different ablation strategies on procedural success at the second ablation in patients with persistent AF (PerAF). Methods Consecutive PerAF patients scheduled to undergo their second ablation were screened and only those that have received PVI plus isolation of left atrial posterior wall (PWI) and superior vena cava (SVC) at the first procedure (n=1390), were included in the analysis. At the second ablation, all reconnected structures were ablated. Additionally, based on operators' decision, non-PV triggers were targeted for ablation. Patients were classified into two groups based on the ablation strategy: group 1: Re-isolation of reconnected PVs, PW, SVC and group 2: additional ablation of non-PV triggers (from inter-atrial septum, coronary sinus (CS), left atrial appendage (LAA) and crista terminalis). Arrhythmia-monitoring was performed quarterly for 1 year and biannually afterwards. Ablation success was assessed off-antiarrhythmic drugs (AAD). Results Of the 1390 patients included in the analysis, 698 were in group 1 and 692 were in group 2. In group 1, reconnected PV, PW and SVC were re-isolated in 98 (14%), 311 (44.5%) and 173 (24.8%) respectively. In 131 (18.7%) patients, in the absence of any reconnection, CS was empirically isolated. In group 2, PV, PW and SVC were re-isolated in 83 (12%), 270 (39%) and 113 (16.3%) patients respectively. Additionally, non-PV triggers were ablated in 505 (73%) and empirical isolation of LAA and CS in the absence of detectable triggers and PV reconnection was performed in 187 (27%). At 2 years of follow-up, 425 (61%) and 602 (87%) from group 1 and 2 were arrhythmia-free off-AAD (p Conclusion Including non-PV triggers as targets for ablation at the repeat procedure was associated with significantly higher success rate in persistent AF. Funding Acknowledgement Type of funding sources: None.

In the past decade, the use of interventional electrophysiological (EP) procedures for the diagnosis and treatment of cardiac arrhythmias has exponentially increased. These procedures usually require fluoroscopy to guide the advancement and frequent repositioning of intracardiac catheters, resulting in both the patient and the operator being subjected to a considerable degree of radiation exposure. Although shielding options such as lead gowns, glasses, and pull-down shields are useful for protecting the operator, they do not lessen the patient’s level of exposure. Furthermore, the prolonged use of lead gowns can exponentiate the onset of orthopedic problems among operators. Recent advancements in three-dimensional cardiac mapping systems and the use of radiation-free imaging technologies such as magnetic resonance imaging and intracardiac ultrasound allow operators to perform EP procedures with minimal or even no fluoroscopy. In this review, we sought to describe the state of fluoroless procedures in EP practice.

Left atrial appendage (LAA) is the dominant source of systemic thromboembolic (TE) events in patients with nonvalvular atrial fibrillation (AF). In patients with significant bleeding risk, various LAA exclusion strategies have been developed as an alternative to pharmacologic TE prophylaxis. Nevertheless, in a relatively small percentage of patients, incomplete LAA closure can be documented, either at the time of procedure or during follow-up. This persistent patency can potentially jeopardize an effective stroke prophylaxis. Hereby, we report an update on the current clinical implications of LAA leaks and how to manage them.

Background Fragmented QRS (fQRS) on 12-lead electrocardiography is a noninvasive marker of intramyocardial conduction delay due to ventricular scarring that has not previously been studied in atrial fibrillation. Objective The purpose of this study was to assess the association of fQRS with left atrial (LA) scarring in patients with persistent atrial fibrillation (PsAF) undergoing first catheter ablation. Methods A total of 376 patients with PsAF were enrolled. Severity of LA scarring was assessed using electroanatomic mapping. Narrow fQRS was defined by the presence of an additional R wave (R′) or notching in the nadir of the S wave, or the presence of >1 R′ in 2 contiguous leads corresponding to inferior, lateral, or anterior myocardial regions. Results Both any degree (97.3% vs 63.3%) and severe (42.2% vs 6.3%) LA scarring were higher in patients with fQRS. Age and fQRS were found to be independent predictors of severe LA scarring. At multiple ventricular regions, fQRS had diagnostic accuracy of 79.8% for prediction of severe LA scarring. Nonpulmonary vein triggers were more often detected and ablated in patients with fQRS and severe LA scarring (84.4% vs 70%; P = .001). Atrial tachyarrhythmia recurrence was observed in 131 patients (34.8%) during 18.9 ± 7.7 months of follow-up, which was significantly higher in patients with fQRS (53.2% vs 16.8%). In multivariate analysis, fQRS was found to be a significant predictor of recurrence (hazard ratio 4.65; 95% interval confidence 2.91–7.42; P Conclusion The study results showed that fQRS is a simple, available, and noninvasive marker, and that fQRS at multiple ventricular regions is significantly associated with the severity of LA scarring in PsAF patients.

Loss of contractility leading to stasis of blood flow following left atrial appendage electrical isolation (LAAEI) could lead to thrombus formation.This study evaluated the incidence of thromboembolic events (TE) in post-LAAEI cases "on" and "off" oral anticoagulation (OAC).A total of 1,854 consecutive post-LAAEI patients with follow-up transesophageal echocardiography (TEE) performed in sinus rhythm at 6 months to assess left atrial appendage (LAA) function were included in this analysis.The TEE at 6 months revealed preserved LAA velocity, contractility, and consistent A waves in 336 (18%) and abnormal parameters in the remaining 1,518 patients. In the post-ablation period, all 336 patients with preserved LAA function were off OAC. At long-term follow-up, patients with normal LAA function did not experience any stroke events. Of the 1,518 patients with abnormal LAA contractility, 1,086 remained on OAC, and the incidence of stroke/transient ischemic attack (TIA) in this population was 18 of 1,086 (1.7%), whereas the number of TE events in the off-OAC patients (n = 432) was 72 (16.7%); p 0.001. Of the 90 patients with stroke, 84 received left atrial appendage occlusion (LAAO) devices. At median 12.4 months (interquartile range: 9.8 to 15.3 months) of device implantation, 2 (2.4%) patients were on OAC because of high stroke risk or personal preference, whereas 81 patients discontinued OAC after LAAO device implantation without any TE events.LAAEI is associated with a significant risk of stroke that can be effectively reduced by optimal uninterrupted OAC or LAAO devices.

Background Atrial fibrillation (AF) triggers within the coronary sinus (CS)/great cardiac vein (GCV) and the left atrial appendage (LAA) have been recognized as nonpulmonary vein triggers of AF. Objective The aim of this study was to describe an electrical connection between the LAA and CS/GCV and its importance in achieving LAA electrical isolation (LAAEI). Methods A total of 488 consecutive patients undergoing catheter ablation for persistent or long-standing persistent AF who showed firing from the LAA and/or from the CS/GCV were enrolled in this multicenter prospective study. In all patients, potential defragmentation of the CS/GCV to achieve isolation and LAAEI was attempted with both endocardial and epicardial ablation. Results In 7% (n = 34) of these patients, after attempting endocardial LAAEI, the LAA was isolated during epicardial ablation in the GCV. In 8% (n = 39) of patients after attempting endocardial LAA isolation, the LAA was isolated during ablation along the endocardial aspect of the GCV. The presence of a venous branch connecting the GCV with the LAA was found in all these patients. In 23% (n = 112) of patients, the isolation of the LAA also isolated the GCV. In all these patients, LAA dissociated firing was present together with the CS/GCV recordings. Conclusion These findings suggest the presence of a distinct electrical connection between the GCV and the LAA. The clinical relevance of our results requires further investigation. Ablation in the CS/GCV can result in inadvertent isolation of the LAA. Ablation of the GCV is relevant to achieve LAAEI. Considering the potential long-term implications, ablation in the distal CS/GCV should prompt assessment of LAA conduction.

Background: Optimal duration of energy delivery in high-power short-duration (HPSD) ablation to create a durable lesion in atrial fibrillation (AF) is not clear yet. We evaluated the association of electrical reconnection with lesion duration in HPSD-ablation. Methods: HPSD ablation was defined as maximum temperature at 42 °C and power delivery at 45 W for 10 to 15 seconds (5 seconds in coronary sinus [CS] and left atrial posterior wall [LAPW] near the esophagus). In some patients, a mechanical tool was used to deflect the esophagus away from the ablation site. Results: Consecutive 1749 patients with AF (left atrial appendage and CS isolation: 1451) receiving redo ablation after a prior HPSD procedure were included. At the HPSD ablation, mean duration of lesion was significantly shorter in the LAPW facing esophagus compared with elsewhere (5.2±1.5 versus 12.5±1.7 seconds, P Conclusions: HPSD ablation with lesion duration of

BACKGROUND Atrioesophageal fistula (AEF) is a worrisome complication of atrial fibrillation (AF) ablation. Its clinical manifestations and time course are unpredictable and may contribute to diagnostic and treatment delays. We conducted a systematic review of all available cases of AEF, aiming at characterizing clinical presentation, time course, diagnostic pitfalls, and outcomes. METHODS The digital search retrieved 150 studies containing 257 cases, 238 (92.6%) of which with a confirmed diagnosis of AEF and 19 (7.4%) of pericardioesophageal fistula. RESULTS The median time from ablation to symptom onset was 21 days (interquartile range [IQR]: 11-28). Neurological abnormalities were documented in 75% of patients. Compared to patients seen by a specialist, those evaluated at a walk-in clinic or community hospital had a significantly greater delay between symptom onset and hospital admission (median: 2.5 day [IQR: 1-8] vs. 1 day [IQR: 1-5); p = .03). Overall, 198 patients underwent a chest scan (computed tomography [CT]: 192 patients and magnetic resonance imaging [MRI]: 6 patients), 48 (24.2%; 46 CT and 2 MRI) of whom had normal/unremarkable findings. Time from hospital admission to diagnostic confirmation was significantly longer in patients with a first normal/unremarkable chest scan (p

Background We evaluated long‐term outcome of isolation of pulmonary veins, left atrial posterior wall, and superior vena cava, including time to recurrence and prevalent triggering foci at repeat ablation in patients with paroxysmal atrial fibrillation with or without cardiovascular comorbidities. Methods and Results A total of 1633 consecutive patients with paroxysmal atrial fibrillation that were arrhythmia‐free for 2 years following the index ablation were classified into: group 1 (without comorbidities); n=692 and group 2 (with comorbidities); n=941. We excluded patients with documented ablation of areas other than pulmonary veins, the left atrial posterior wall, and the superior vena cava at the index procedure. At 10 years after an average of 1.2 procedures, 215 (31%) and 480 (51%) patients had recurrence with median time to recurrence being 7.4 (interquartile interval [IQI] 4.3–8.5) and 5.6 (IQI 3.8–8.3) years in group 1 and 2, respectively. A total of 201 (93.5%) and 456 (95%) patients from group 1 and 2 underwent redo ablation; 147/201 and 414/456 received left atrial appendage and coronary sinus isolation and 54/201 and 42/456 had left atrial lines and flutter ablation. At 2 years after the redo, 134 (91.1%) and 391 (94.4%) patients from group 1 and 2 receiving left atrial appendage/coronary sinus isolation remained arrhythmia‐free whereas sinus rhythm was maintained in 4 (7.4%) and 3 (7.1%) patients in respective groups undergoing empirical lines and flutter ablation ( P Conclusions Very late recurrence of atrial fibrillation after successful isolation of pulmonary veins, regardless of the comorbidity profile, was majorly driven by non‐pulmonary vein triggers and ablation of these foci resulted in high success rate. However, presence of comorbidities was associated with significantly earlier recurrence.

Background We compared the cognitive status and quality of life in patients with atrial fibrillation undergoing left atrial appendage occlusion (LAAO) or remaining on oral anticoagulation (OAC) after atrial fibrillation ablation. Methods and Results Cognition was assessed by the Montreal Cognitive Assessment (MoCA) survey at baseline and follow‐up. Consecutive patients receiving LAAO or OAC after atrial fibrillation ablation were screened, and patients with a score of ≤17 were excluded from the study. Quality of life was measured at baseline and 1 year using the Atrial Fibrillation Effect on Quality of Life survey. A total of 50 patients (CHA 2 DS 2 ‐VASc [congestive heart failure, hypertension, age≥75 years, diabetes mellitus, stroke or transient ischemic attack, vascular disease, age 65–74 years, sex category] score: 3.30±1.43) in the LAAO group and 48 (CHA 2 DS 2 ‐VASc score 2.73±1.25) in the OAC group were included in this prospective study. Mean baseline MoCA score was 26.18 and 26.08 in the LAAO and OAC groups, respectively ( P =0.846). At 1 year, scores were 26.94 and 23.38 in the respective groups. MoCA score decreased by an estimated −2.74 (95% CI, −3.61 to −1.87; P P =0.07). After adjusting for baseline clinical characteristics, remaining on OAC was an independent predictor of MoCA change at 1 year (regression coefficient, −3.38; 95% CI, −4.75 to −2.02; P Conclusions In this series, a significant difference in the postprocedure MoCA score was observed in postablation patients with atrial fibrillation receiving LAAO versus remaining on OAC with a substantial decline in the score in the OAC group. However, quality of life improved similarly across groups. Registration https://www.ClinicalTrials.gov . Unique identifier: NCT01816308

BACKGROUND This study evaluated the arrhythmia profile and ablation outcome in women with atrial fibrillation (AF) aged ≥75 years. METHODS A total of 573 consecutive female patients undergoing first AF ablation were classified into group 1: ≥75 years (n = 221) and group 2