JACC. Clinical electrophysiology
Audio Summaries

Beta-Blockers and Exercise Performance in Children with Long QT Syndrome

Jul 10, 2026

This study aimed to investigate the impact of beta-blocker dosage on exercise performance, specifically cardiopulmonary fitness, in children with long QT syndrome (LQTS). The authors found no significant correlation between nadolol dosage and objective measures of exercise performance, such as peak oxygen consumption and respiratory exchange ratio, suggesting that beta-blocker treatment does not adversely affect exercise capacity in most patients with LQTS. These findings were further supported by data from a validation cohort using atenolol.

Comparison of Pacing Lead Design on Left Bundle Branch Pacing Outcomes: LEAD-LBBP Randomized Clinical Trial

Jul 10, 2026

The LEAD-LBBP randomized clinical trial aimed to compare the outcomes of lumenless leads (LLLs) versus stylet-driven leads (SDLs) in patients undergoing left bundle branch pacing (LBBP). The study found that SDLs were associated with a higher incidence of left bundle branch capture loss, lower acute procedural success, and increased lead damage during implantation compared to LLLs. These results suggest that lead selection is critical for optimizing outcomes in LBBP procedures.

MAGNETOcardiography Parameters to Predict Sudden Cardiac Death (MAGNETO-SCD) or Ventricular Events From Implantable Cardioverter Defibrillators

Jul 10, 2026

The study aimed to evaluate whether novel magnetocardiography (MCG) parameters, specifically Rotation Score and Angular Dynamics, could predict the occurrence of appropriate therapies from implantable cardioverter defibrillators (ICDs) in patients at risk of sudden cardiac death. Results indicated that higher values of these MCG parameters were significantly associated with increased likelihood of ICD therapies, particularly shocks, suggesting their potential utility in risk stratification beyond traditional measures like left ventricular ejection fraction. The authors advocate for further validation of these findings in larger cohorts to confirm their clinical relevance.

PVI Durability After PFA or RFA in Persistent-AF: Insights From a Mandated Prospective Remapping Study

Jun 26, 2026

This study aimed to compare the durability of pulmonary vein isolation (PVI) and the rates of arrhythmia recurrence between pulsed field ablation (PFA) and radiofrequency ablation (RFA) in patients with persistent atrial fibrillation (AF). The results indicated that PFA and RFA had similar PVI durability (79% vs. 76%) and freedom from recurrence at one year, despite a significant number of patients experiencing AF recurrence even with durable PVI, suggesting the influence of non-pulmonary vein mechanisms in AF recurrence.

Leveraging Large Language Models to Identify In-Hospital Cardiac Arrest

Jun 26, 2026

The authors investigate whether large language models can effectively identify in-hospital cardiac arrest (IHCA) from clinical notes, as traditional methods like manual chart abstraction are resource-intensive and diagnosis codes lack sensitivity. They propose a novel approach that leverages these models to enhance the speed and accuracy of IHCA identification, aiming to improve automated detection in clinical settings.

Repolarization and Activation Mapping in Ventricular Tachycardia Ablation: The REDEEM Study

Jun 26, 2026

The REDEEM study aimed to evaluate a novel sinus rhythm mapping technique that combines repolarization and activation mapping to identify critical isthmus sites during ventricular tachycardia (VT) ablation. The findings demonstrated that the proposed method effectively identified anatomical associations with VT isthmus sites, with a notable overlap of repolarization cliffs and deceleration zones with VT exit and entrance sites. This study suggests the potential of the REDEEM method for improving VT ablation strategies, warranting further prospective validation.

Physiological Markers of Effective Autonomic Denervation Are Associated With Outcomes After Cardioneuroablation for Vasovagal Syncope

Jun 26, 2026

The authors aimed to identify procedural markers associated with long-term outcomes following cardioneuroablation (CNA) for patients with recurrent vasovagal syncope. They found that specific physiological responses during the procedure, such as a vagal response and an increase in sinus rate, were linked to a lower recurrence of syncope, suggesting that these markers could help optimize CNA outcomes. Despite these findings, the study also highlighted a significant rate of recurrent syncope in the intermediate term, indicating the need for improved procedural endpoints.

Early Safety Profile Using Pulsed Field Ablation: Prospective Multicenter DISRUPT-AF Study

Jun 26, 2026

The DISRUPT-AF study aimed to evaluate the safety profile of pentaspline pulsed field ablation (PFA) for atrial fibrillation in a real-world setting across multiple centers in the U.S. The results indicated a low rate of procedure/device-related adverse events, with no significant injuries to critical structures such as the esophagus or phrenic nerve, suggesting a potentially safer alternative to traditional thermal ablation methods.

Redo Ablation Following LSI Algorithm-Guided High-Power Short-Duration vs LSI Algorithm-Guided Conventional Radiofrequency for Atrial Fibrillation

Jun 23, 2026

The authors aimed to compare the outcomes of redo procedures following pulmonary vein isolation (PVI) using Lesion Size Index (LSI) algorithm-guided high-power short-duration (HPSD) radiofrequency ablation versus conventional radiofrequency ablation. Their findings indicate that HPSD ablation at 50 W is associated with significantly lower rates of redo procedures and pulmonary vein reconnection compared to conventional 30 W ablation, suggesting improved durability of the HPSD approach, although it also revealed higher reconnection rates in specific anatomical regions.

Intravascular Hemolysis and Pulsed-Field Ablation: State of the Art Review

Jun 23, 2026

This review investigates the incidence and clinical implications of intravascular hemolysis (IH) as a complication of pulsed-field ablation (PFA), synthesizing data from studies conducted between 2020 and 2025. The authors assess the interpretability of these studies based on biomarker kinetics and energy delivery determinants, concluding that while IH is common, it is rarely clinically significant, particularly in patients without renal dysfunction. They recommend tailored ablation strategies and selective biomarker screening for high-risk patients to mitigate complications.