Marta Lorente-Ros, Álvaro Lorente-Ros, Mohammad S Husain, Travis Hong, Jessica Sweeney, Adrian Baranchuk, Susan O'Donoghue
{"title":"Brugada Phenocopies: A Review of Mechanisms, Clinical Implications and Prognostic Considerations.","authors":"Marta Lorente-Ros, Álvaro Lorente-Ros, Mohammad S Husain, Travis Hong, Jessica Sweeney, Adrian Baranchuk, Susan O'Donoghue","doi":"10.15420/aer.2026.16","DOIUrl":"https://doi.org/10.15420/aer.2026.16","url":null,"abstract":"<p><p>Brugada phenocopy (BrP) is a clinical entity characterised by an identical ECG pattern to that of Brugada syndrome, albeit in the absence of congenital sodium channel dysfunction. In BrP, diagnosis is based on the presence of an identifiable underlying trigger that elicits the typical ECG pattern and non-reproducible electrical changes associated with the administration of sodium channel blockers. Although a wide variety of conditions can elicit BrP, the underlying electrophysiological mechanisms leading to the ECG changes are incompletely understood. Experimental models mimicking phenocopy-inducing conditions and integrative evidence of genetic and environmentally modulated mechanisms of sodium channel dysfunction are imperative to gain insights into the mechanisms behind BrP. In this review, we summarise current literature on BrP and describe aetiologies and reproducibility, diagnostic and therapeutic approaches, prognostic implications and emerging evidence on the pathophysiological mechanisms behind the spectrum of phenotypes of sodium channel dysfunction that can help understand the phenomenon of BrP.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e31"},"PeriodicalIF":4.3,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13655743/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149179119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Merna Abdou, Aaron A Sifuentes, Ghazaleh Goldar, Ran Lee, Supriya Shore
{"title":"Management of Post-heart Transplant Atrial Fibrillation.","authors":"Merna Abdou, Aaron A Sifuentes, Ghazaleh Goldar, Ran Lee, Supriya Shore","doi":"10.15420/aer.2025.45","DOIUrl":"https://doi.org/10.15420/aer.2025.45","url":null,"abstract":"<p><p>AF is the most common atrial arrhythmia encountered after orthotopic heart transplantation, with distinct pathophysiology and clinical implications. While early postoperative AF is typically transient, late-onset AF is increasingly recognised as a marker of graft dysfunction, rejection or vasculopathy. Risk factors include advanced recipient age, prolonged ischaemic time and immunosuppressive therapy. The denervated status of the transplanted heart alters typical electrophysiology, complicating diagnosis and management. Management requires individualised strategies balancing rate versus rhythm control, careful drug interaction monitoring and thromboembolic risk assessment. Emerging evidence supports catheter ablation in select cases, although data remain limited. Immunosuppressants, particularly calcineurin inhibitors and azathioprine, may increase AF susceptibility. Given the lack of transplant-specific AF guidelines, a multidisciplinary approach is essential. Improved understanding of AF in orthotopic heart transplantation is critical to optimising graft longevity and patient survival. Future studies are needed to guide evidence-based management and surveillance.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e30"},"PeriodicalIF":4.3,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13655742/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149179142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Arterial Supply to the Atrioventricular Node: Anatomical Variability and Clinical Implications.","authors":"Tomokazu Kawashima","doi":"10.15420/aer.2026.22","DOIUrl":"10.15420/aer.2026.22","url":null,"abstract":"<p><p>Atrioventricular block (AVB) resulting from injury or ischaemia of the atrioventricular node (AVN) artery remains a key concern in inferior MI and procedures near the AVN. Given that ECG findings alone may be insufficient to reliably predict AVB occurrence or reversibility, anatomy-based risk assessment is essential. However, <i>in vivo</i> identification of the AVN artery is limited by its small size and marked anatomical variability and by the lack of specific markers for the AVN itself to confirm the artery's terminal distribution. A main AVN artery typically arises near the cardiac crux and courses through the inferior pyramidal space, although its origin and trajectory vary. In addition, supplementary arterial supply may reach the node via anatomically distinct pathways, most commonly through the antero-inferior buttress of the atrial septum. These separate pathways variably contribute to nodal perfusion. Combined with positional variability of the AVN, this complexity limits precise anatomical risk stratification and may explain the heterogeneity of AVB occurrence and reversibility.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e29"},"PeriodicalIF":4.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13595271/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Krzysztof Piotr Malinowski, Klaudia Proniewska, Peter M van Dam
{"title":"Objective Assessment of Pathological ECG Waveforms Using Gender-specific Normal Waveform Distributions.","authors":"Krzysztof Piotr Malinowski, Klaudia Proniewska, Peter M van Dam","doi":"10.15420/aer.2025.51","DOIUrl":"10.15420/aer.2025.51","url":null,"abstract":"<p><strong>Introduction: </strong>The objective definition of the normal ECG waveform is difficult, even 121 years after Einthoven's invention of the ECG. Consequently, ECG evaluation is primarily focused on interval measurements. For the waveforms, many rules and exceptions apply, making the interpretation of the ECG waveforms an art. In this study, a novel method is proposed that compares ECG waveforms with a distribution of normal ECG waveforms (WaveECG) and vectorcardiographic-derived positions of the electrical activity (PathECG) in order to determine the pathological status of the ECG.</p><p><strong>Methods: </strong>Human-annotated ECGs from the PhysioNet PTB-XL Diagnostic ECG database were used. ECGs classified as normal were used to create gender-specific distributions of the normal WaveECG and PathECG. The similarity between the evaluated ECG and the distributions was then quantified. Logistic regression was used to examine the potential of PathECG and WaveECG in the prediction of an abnormal ECG waveform. The independent China Physiological Signal Challenge database was used for validation.</p><p><strong>Results: </strong>A total of 14,381 ECGs were used to construct the distribution of the normal WaveECG and PathECG and to fit the model, and 6,320 independent ECGs were used for validation. The QRS model performance had an area under the receiver operating characteristic curve of 82.1% (95% CI [80.3-84%]) for male patients and 86.1% (95% CI [84.7-87.6%]) for female patients. The area under the receiver operating characteristic curve of the P wave model was 65.4% (95% CI [62.8-68.0%]) for female patients and 66.8% (95% CI [63.9-69.6%]) for male patients.</p><p><strong>Conclusion: </strong>An abnormal ECG can be detected in an explainable and visually understandable way by comparing the ECG to the distribution of normal ECGs. This method might significantly support the less experienced ECG reader in identifying patients requiring cardiac care.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e28"},"PeriodicalIF":4.3,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13573016/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148966318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jie Liu, Hao Liu, Dan Yu, Tingyin Chen, Zhaoxin Qian, Yuting Chen, Wendong Chen, Ruizheng Shi
{"title":"Clinical Burden of Post-ablation Atrial Fibrillation Recurrence in East Asia: A Systematic Literature Review.","authors":"Jie Liu, Hao Liu, Dan Yu, Tingyin Chen, Zhaoxin Qian, Yuting Chen, Wendong Chen, Ruizheng Shi","doi":"10.15420/aer.2025.64","DOIUrl":"10.15420/aer.2025.64","url":null,"abstract":"<p><strong>Aim: </strong>This study aimed to systematically review and synthesise existing real-world evidence on the clinical characteristics and outcomes of patients with post-ablation AF recurrence in east Asia.</p><p><strong>Methods: </strong>Following the PRISMA guidelines, main Chinese- and English-language databases were searched for observational studies published from 2019 to 2024. Inclusion criteria targeted East Asian patients aged ≥18 years with post-ablation AF recurrence. Two independent reviewers conducted study selection, data extraction and quality assessment using the Newcastle-Ottawa Scale. Meta-analyses were performed using a random effects model to synthesise the extracted data.</p><p><strong>Results: </strong>A total of 68 studies involving 28,750 patients were included. Paroxysmal AF accounted for about half of the population (53.4%; 95% CI [47.8-58.9]). Common comorbidities included hypertension (52.6%; 95% CI [50.2-55.0]), coronary artery disease (17.2%; 95% CI [12.9-22.5]) and diabetes (16.8%; 95% CI [14.9-18.8]). The AF recurrence rates after repeat ablation (21.4%; 95% CI [16.6-27.1]) and antiarrhythmic drug therapy (19.6%; 95% CI [18.0-21.2]) were similar. Recurrence was higher in patients with late recurrence (32.6%; 95% CI [26.9-38.8]) than those with early recurrence (21.5%; 95% CI [17.9-25.6]). The pooled 3-year incidence of major events included heart failure hospitalisation (3.2%; 95% CI [2.8-3.6]), ischaemic stroke (1.2%; 95% CI [0.9-1.7]) and cardiovascular-related death (0.3%; 95% CI [0.1-0.5]).</p><p><strong>Conclusion: </strong>Post-ablation AF recurrence in East Asia imposes a considerable disease burden with high recurrence rates even after repeated ablation or antiarrhythmic drug therapy. The presence of prevalent comorbidities and measurable risks of morbidity and mortality further contribute to the long-term clinical and economic burdens of AF.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e27"},"PeriodicalIF":4.3,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13425645/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Confirming Dissociated Pulmonary Vein Activity after Pulmonary Vein Isolation While Still in Atrial Fibrillation: Are We Scooping the Moon in the Water?","authors":"Simon Salim, Ying-Chieh Liao, Shih-Ann Chen","doi":"10.15420/aer.2026.21","DOIUrl":"10.15420/aer.2026.21","url":null,"abstract":"","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e26"},"PeriodicalIF":4.3,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13389308/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148560524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Catheter Ablation as an Early Rhythm-control Strategy in Patients with Atrial Fibrillation and Heart Failure.","authors":"Mutaz Alkalbani, Chirag Sandesara","doi":"10.15420/aer.2026.03","DOIUrl":"10.15420/aer.2026.03","url":null,"abstract":"<p><p>AF and heart failure (HF) commonly coexist, and this significantly increases patient morbidity and mortality. Maintaining sinus rhythm is a key treatment goal, as it helps prevent HF progression, improves quality of life and reduces cardiovascular mortality. Catheter ablation (CA) has emerged as an effective and preferred alternative to antiarrhythmic medications for rhythm control in patients with AF and HF. Multiple studies have demonstrated the superiority of CA over medical therapy for maintaining sinus rhythm and improving left ventricular function in the HF population, particularly those with reduced left ventricular ejection fraction. Additionally, CA is associated with a low complication rate due to advancing technology and is cost-effective. With growing evidence and endorsement from recent guidelines, clinical practice has shifted towards early CA in patients with AF and HF. Prioritising early intervention represents a proactive approach to improving long-term outcomes.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e25"},"PeriodicalIF":4.3,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13389307/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148560489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Prevalence and Discrimination of On-going Fibrillation in Isolated Pulmonary Vein in Non-paroxysmal AF Ablation.","authors":"Ling-Cong Kong, Tian Shuang, Jian-Feng Huang, Hai-Feng Wang, Zhi-Guo Zou, Xin-Hua Wang","doi":"10.15420/aer.2025.68","DOIUrl":"10.15420/aer.2025.68","url":null,"abstract":"<p><strong>Background: </strong>It is unclear whether on-going fibrillation in isolated pulmonary veins (OFIP) may coexist with AF in patients undergoing ablation for non-paroxysmal AF (PAF). This study explored the prevalence of OFIP in non-PAF ablation with the aim of developing an algorithm to distinguish between OFIP and isolation failure, thereby minimising excessive ablation.</p><p><strong>Methods: </strong>Non-PAF patients undergoing first-time ablation were divided into a retrospective induction cohort (IC; n=300) and a prospective validation cohort (VC; n=263). In the case of on-going pulmonary vein (PV) fibrillation after ablation, the completeness of PV isolation was assessed based on the change in PV potential and after additional ablation.</p><p><strong>Results: </strong>Among 563 patients, 20 (3.55%) had OFIP (9 in the IC; 11 in the VC). No significant predictors of OFIP were identified in terms of baseline characteristics or procedural factors. Based on three right-sided, five left-sided and one bilateral case of OFIP in the IC, the disappearance of PV potential (either spontaneous or mechanical bumping-induced) or a combination of bipolar voltage reduction >80%, local activation time later than PV recordings and no response to carina ablation were adopted as major criteria in the algorithm to discriminate between OFIP and isolation failure. Among the 20 patients in the VC with on-going PV fibrillation, the algorithm identified true OFIP in 11, false OFIP in three and true incomplete PV isolation in six. The sensitivity, specificity and positive and negative predictive values of the algorithm were 100%, 66.7%, 78.6% and 100%, respectively.</p><p><strong>Conclusion: </strong>The rate of OFIP was not negligible in non-PAF patients undergoing ablation procedures to achieve efficient and safe PV isolation. A novel four-step algorithm was developed to discriminate OFIP from isolation failure, with good predictive value.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e24"},"PeriodicalIF":4.3,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13294567/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148343719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nadiya Johal, Badrinathan Chandrasekaran, Paul Foley
{"title":"T Wave Oversensing in Left Bundle Branch Optimised CRT.","authors":"Nadiya Johal, Badrinathan Chandrasekaran, Paul Foley","doi":"10.15420/aer.2025.52","DOIUrl":"10.15420/aer.2025.52","url":null,"abstract":"<p><p>Five patients who underwent left bundle branch optimised (LOT)-CRT developed T wave oversensing (TWOS) between 2 months and 2 years post implant. LOT-CRT resulted in greater improvement in left ventricular size and function compared with historical case-matched controls. No patients experienced symptoms or inappropriate therapy as a result of TWOS. This report describes the occurrence, potential mechanisms and management of TWOS in patients undergoing LOT-CRT.</p>","PeriodicalId":8412,"journal":{"name":"Arrhythmia & Electrophysiology Review","volume":"15 ","pages":"e22"},"PeriodicalIF":4.3,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13284782/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148306731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}