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Seghetti P, Latrofa S, Biasi N, Giannoni A, Hartwig V, Rossi A, Tognetti A. Electrophysiological patterns and structural substrates of Brugada syndrome: Critical appraisal and computational analyses. J Cardiovasc Electrophysiol 2024; 35:1673-1687. [PMID: 38899376 DOI: 10.1111/jce.16341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 05/24/2024] [Accepted: 06/03/2024] [Indexed: 06/21/2024]
Abstract
Brugada syndrome (BrS) is a cardiac electrophysiological disease with unknown etiology, associated with sudden cardiac death. Symptomatic patients are treated with implanted cardiac defibrillator, but no risk stratification strategy is effective in patients that are at low to medium arrhythmic risk. Cardiac computational modeling is an emerging tool that can be used to verify the hypotheses of pathogenesis and inspire new risk stratification strategies. However, to obtain reliable results computational models must be validated with consistent experimental data. We reviewed the main electrophysiological and structural variables from BrS clinical studies to assess which data could be used to validate a computational approach. Activation delay in the epicardial right ventricular outflow tract is a consistent finding, as well as increased fibrosis and subclinical alterations of right ventricular functional and morphological parameters. The comparison between other electrophysiological variables is hindered by methodological differences between studies, which we commented. We conclude by presenting a recent theory unifying electrophysiological and structural substrate in BrS and illustrate how computational modeling could help translation to risk stratification.
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Affiliation(s)
- Paolo Seghetti
- Health Science Interdisciplinary Center, Scuola Superiore Sant'Anna, Pisa, Italy
- Institute of Clinical Physiology, National Research Council, Pisa, Italy
| | - Sara Latrofa
- Health Science Interdisciplinary Center, Scuola Superiore Sant'Anna, Pisa, Italy
| | - Niccolò Biasi
- Department of Information Engineering, Università di Pisa, Pisa, Italy
| | - Alberto Giannoni
- Health Science Interdisciplinary Center, Scuola Superiore Sant'Anna, Pisa, Italy
- Fondazione Toscana 'G. Monasterio', Pisa, Italy
| | - Valentina Hartwig
- Institute of Clinical Physiology, National Research Council, Pisa, Italy
- Fondazione Toscana 'G. Monasterio', Pisa, Italy
| | | | - Alessandro Tognetti
- Department of Information Engineering, Università di Pisa, Pisa, Italy
- Research Center 'Enrico Piaggio', Università di Pisa, Pisa, Italy
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Morita H, Asada S, Nagase S, Ueoka A, Masuda T, Miyamoto M, Nakagawa K, Nishii N, Yuasa S. Late gadolinium enhancement in early repolarization syndrome. Heart Rhythm 2024:S1547-5271(24)03093-5. [PMID: 39094725 DOI: 10.1016/j.hrthm.2024.07.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 07/15/2024] [Accepted: 07/27/2024] [Indexed: 08/04/2024]
Abstract
BACKGROUND In patients with Brugada syndrome, myocardial fibrosis can be identified through epicardial biopsy or cardiac magnetic resonance (CMR) imaging with late gadolinium enhancement (LGE). However, the myocardial alterations in patients with early repolarization syndrome (ERS) remain poorly elucidated. OBJECTIVE The objective of this study was to investigate the presence of myocardial fibrosis in patients with ERS by LGE in CMR. METHODS We retrospectively evaluated 20 patients with ERS, all of whom exhibited J waves in the contiguous 2 leads. The location of J waves was classified as in the septum (V1-V2), anterior (V3-V4), lateral (I, aVL, V5-V6), inferior (II, III, aVF), or posterior (V7-V9) regions. To compare the distribution of LGE on CMR imaging with J waves, sections on short-axis view of the left ventricle (LV) were categorized as located in the septum, anterior, lateral, inferior, and posterior regions. RESULTS Overall, 85% of ERS patients displayed LGE, which was more prevalent in the septum and posterior regions, followed by the inferior and lateral regions. The presence or absence of J waves and LGE coincided in 61% of LV areas, whereas discordance between the distributions of J waves and LGE was observed in 38%. LGE was most frequent in the septum (75%), where its reflection in J waves may be less robust. The appearance of LGE was not associated with symptoms, electrical storm, or ventricular fibrillation occurrence during follow-up. CONCLUSION LGE is common in patients with ERS, and the distribution of J waves and LGE coincides in approximately 60% of LV areas.
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Affiliation(s)
- Hiroshi Morita
- Department of Cardiovascular Therapeutics, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.
| | - Saori Asada
- Department of Cardiovascular Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
| | - Satoshi Nagase
- Department of Advanced Arrhythmia and Translational Medical Science, National Cerebral and Cardiovascular Center, Suita, Japan; Department of Cardiovascular Medicine, Kawasaki Medical School General Medical Center, Okayama, Japan
| | - Akira Ueoka
- Department of Cardiovascular Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
| | - Takuro Masuda
- Department of Cardiovascular Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
| | - Masakazu Miyamoto
- Department of Cardiovascular Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
| | - Koji Nakagawa
- Department of Cardiovascular Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
| | - Nobuhiro Nishii
- Department of Cardiovascular Therapeutics, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Shinsuke Yuasa
- Department of Cardiovascular Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
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Matusik PT, Bijak P, Kaźnica-Wiatr M, Karpiński M, Matusik PS, Maziarz A, Podolec P, Lelakowski J. Twelve-Lead ECG, Holter Monitoring Parameters, and Genetic Testing in Brugada Syndrome: Insights from Analysis of Multigenerational Family with a History of Sudden Cardiac Arrest during Physical Activity. J Clin Med 2023; 12:6581. [PMID: 37892719 PMCID: PMC10607905 DOI: 10.3390/jcm12206581] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/08/2023] [Accepted: 10/11/2023] [Indexed: 10/29/2023] Open
Abstract
Brugada syndrome (BrS) is an arrhythmogenic disorder increasing the risk of syncopal episodes and sudden cardiac death. BrS usually runs through families with reduced penetrance and variable expression. We analyzed the multigenerational family of a patient who died after sudden cardiac arrest with post-mortem diagnosis of BrS. We analyzed clinical history, comprehensive arrhythmic risk, genetic findings, and additional tests, including electrocardiogram (ECG), detailed 24-hour Holter ECG results, and standard echocardiography findings, and followed up the patients in the ambulatory clinic. We analyzed a pedigree of 33 members of four generations of the family (19 male and 14 female patients). In this family, we identified 7 patients with BrS (median Modified Shanghai Score and Sieira model: 4.5 (4-6) and 1 (0-4) points, respectively), including both parents of the deceased patient, and 8 relatives with negative sodium channel blocker drug challenge test. Genetic testing revealed a novel mutation in sodium voltage-gated channel alpha subunit 5 (SCN5A) c.941A>G, (p.Tyr314Cys) inherited from the father of the proband. Patients with BrS were characterized by longer P-wave duration (120 (102-155) vs. 92.5 (88-110) ms, p = 0.013) and longer PR intervals (211.3 ±26.3 vs. 161.6 ± 18.9 ms, p = 0.001), along with more frequent positive aVR sign, but did not differ in terms of QRS duration or T-wave characteristics in resting ECGs. BrS patients were characterized by lower mean, minimal, and maximal (for all p ≤ 0.01) heart rates obtained from Holter ECG monitoring, while there was no difference in arrhythmias among investigated patients. Moreover, visual diurnal variability of ST segment changes and fragmented QRS complexes were observed in patients with BrS in Holter ECG monitoring. There were no major arrhythmic events during median follow-up of 68.7 months of alive BrS patients. These results suggest ECG features which may be associated with a diagnosis of BrS and indicate a novel SCN5A variant in BrS patients. Twelve-lead Holter ECG monitoring, with modified precordial leads placement, may be useful in BrS diagnostics and risk stratification in personalized medicine.
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Affiliation(s)
- Paweł T. Matusik
- Institute of Cardiology, Faculty of Medicine, Jagiellonian University Medical College, 31-202 Kraków, Poland
- Department of Electrocardiology, The John Paul II Hospital, 31-202 Kraków, Poland
| | - Piotr Bijak
- Cardiology Outpatient Clinic, The John Paul II Hospital, 31-202 Kraków, Poland
| | - Magdalena Kaźnica-Wiatr
- Department of Cardiac and Vascular Diseases, The John Paul II Hospital, 31-202 Kraków, Poland
| | - Marek Karpiński
- Genetic Counselling Outpatient Clinic, The John Paul II Hospital, 31-202 Kraków, Poland
| | - Patrycja S. Matusik
- Department of Diagnostic Imaging, University Hospital, 30-688 Kraków, Poland
- Chair of Radiology, Jagiellonian University Medical College, 31-501 Kraków, Poland
| | - Andrzej Maziarz
- Department of Electrocardiology, The John Paul II Hospital, 31-202 Kraków, Poland
| | - Piotr Podolec
- Institute of Cardiology, Faculty of Medicine, Jagiellonian University Medical College, 31-202 Kraków, Poland
- Department of Cardiac and Vascular Diseases, The John Paul II Hospital, 31-202 Kraków, Poland
| | - Jacek Lelakowski
- Institute of Cardiology, Faculty of Medicine, Jagiellonian University Medical College, 31-202 Kraków, Poland
- Department of Electrocardiology, The John Paul II Hospital, 31-202 Kraków, Poland
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Miles C, Boukens BJ, Scrocco C, Wilde AA, Nademanee K, Haissaguerre M, Coronel R, Behr ER. Subepicardial Cardiomyopathy: A Disease Underlying J-Wave Syndromes and Idiopathic Ventricular Fibrillation. Circulation 2023; 147:1622-1633. [PMID: 37216437 PMCID: PMC11073566 DOI: 10.1161/circulationaha.122.061924] [Citation(s) in RCA: 24] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 03/27/2023] [Indexed: 05/24/2023]
Abstract
Brugada syndrome (BrS), early repolarization syndrome (ERS), and idiopathic ventricular fibrillation (iVF) have long been considered primary electrical disorders associated with malignant ventricular arrhythmia and sudden cardiac death. However, recent studies have revealed the presence of subtle microstructural abnormalities of the extracellular matrix in some cases of BrS, ERS, and iVF, particularly within right ventricular subepicardial myocardium. Substrate-based ablation within this region has been shown to ameliorate the electrocardiographic phenotype and to reduce arrhythmia frequency in BrS. Patients with ERS and iVF may also exhibit low-voltage and fractionated electrograms in the ventricular subepicardial myocardium, which can be treated with ablation. A significant proportion of patients with BrS and ERS, as well as some iVF survivors, harbor pathogenic variants in the voltage-gated sodium channel gene, SCN5A, but the majority of genetic susceptibility of these disorders is likely to be polygenic. Here, we postulate that BrS, ERS, and iVF may form part of a spectrum of subtle subepicardial cardiomyopathy. We propose that impaired sodium current, along with genetic and environmental susceptibility, precipitates a reduction in epicardial conduction reserve, facilitating current-to-load mismatch at sites of structural discontinuity, giving rise to electrocardiographic changes and the arrhythmogenic substrate.
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Affiliation(s)
- Chris Miles
- Cardiovascular Clinical Academic Group, St. George’s University Hospitals’ NHS Foundation Trust and Molecular and Clinical Sciences Institute, St. George’s, University of London, UK (C.M., C.S., E.R.B.)
| | - Bastiaan J. Boukens
- Department of Medical Biology, University of Amsterdam, the Netherlands (B.J.B.)
- University of Maastricht, Cardiovascular Research Institute Maastricht, Maastricht University Medical Center, the Netherlands (B.J.B.)
| | - Chiara Scrocco
- Cardiovascular Clinical Academic Group, St. George’s University Hospitals’ NHS Foundation Trust and Molecular and Clinical Sciences Institute, St. George’s, University of London, UK (C.M., C.S., E.R.B.)
| | - Arthur A.M. Wilde
- Amsterdam UMC, University of Amsterdam, Department of Cardiology, the Netherlands (A.A.M.W.)
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (A.A.M.W.)
- European Reference Network for rare, low-prevalence, and complex diseases of the heart: ERN GUARD-Heart (A.A.M.W., M.H.)
| | - Koonlawee Nademanee
- Center of Excellence in Arrhythmia Research Chulalongkorn University, Department of Medicine, Chulalongkorn University, Thailand (K.N.)
- Pacific Rim Electrophysiology Research Institute, Bumrungrad Hospital, Bangkok, Thailand (K.N.)
| | - Michel Haissaguerre
- European Reference Network for rare, low-prevalence, and complex diseases of the heart: ERN GUARD-Heart (A.A.M.W., M.H.)
- Institut Hospitalo-Universitaire Liryc, Electrophysiology and Heart Modeling Institute, Pessac, France (M.H.)
- Department of Electrophysiology and Cardiac Stimulation, Centre Hospitalier Universitaire de Bordeaux, France (M.H.)
| | - Ruben Coronel
- Department of Experimental Cardiology, Amsterdam University Medical Centers, Cardiovascular Science, the Netherlands (R.C.)
| | - Elijah R. Behr
- Cardiovascular Clinical Academic Group, St. George’s University Hospitals’ NHS Foundation Trust and Molecular and Clinical Sciences Institute, St. George’s, University of London, UK (C.M., C.S., E.R.B.)
- Mayo Clinic Healthcare, London, UK (E.R.B.)
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De Raffele M, Di Domenico A, Balla C, Vitali F, Boccadoro A, Pavasini R, Micillo M, Cocco M, Campo G, Bertini M, Tonet E. Structural Abnormalities in Brugada Syndrome and Non-Invasive Cardiac Imaging: A Systematic Review. BIOLOGY 2023; 12:biology12040606. [PMID: 37106806 PMCID: PMC10136319 DOI: 10.3390/biology12040606] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/30/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023]
Abstract
The aim of this review is to identify possible structural abnormalities of BrS and their potential association with symptoms, risk stratification, and prognosis. (1) Background: BrS has always been considered a purely electrical disease and imaging techniques do not currently play a specific role in the diagnosis of this arrhythmic syndrome. Some authors have recently hypothesized the presence of structural and functional abnormalities. Therefore, several studies investigated the presence of pathological features in echocardiography and cardiac magnetic resonance imaging (MRI) in patients with BrS, but results were controversial. (2) Methods: We performed a systematic review of the literature on the spectrum of features detected by echocardiography and cardiac MRI. Articles were searched in Pubmed, Cochrane Library, and Biomed Central. Only papers published in English and in peer-reviewed journals up to November 2021 were selected. After an initial evaluation, 596 records were screened; the literature search identified 19 relevant articles. (3) Results: The imaging findings associated with BrS were as follows: right ventricular dilation, right ventricular wall motion abnormalities, delayed right ventricular contraction, speckle and feature tracking abnormalities, late gadolinium enhancement, and fat infiltration in the right ventricle. Furthermore, these features emerged more frequently in patients carrying the genetic mutation on the sodium voltage-gated channel α-subunit 5 (SCN5A) gene. (4) Conclusions: Specific imaging features detected by echocardiography and cardiac magnetic resonance are associated with BrS. However, this population appears to be heterogeneous and imaging anomalies emerged to be more frequent in patients carrying genetic mutations of SCN5A. Future studies with an evaluation of BrS patients are needed to identify the specific association linking the Brugada pattern, imaging abnormalities and their possible correlation with prognosis.
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Affiliation(s)
- Martina De Raffele
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Assunta Di Domenico
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Cristina Balla
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Francesco Vitali
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Alberto Boccadoro
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Rita Pavasini
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Marco Micillo
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Marta Cocco
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Gianluca Campo
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Matteo Bertini
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
| | - Elisabetta Tonet
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria di Ferrara, 44124 Cona, FE, Italy
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Isbister JC, Gray B, Offen S, Yeates L, Naoum C, Medi C, Raju H, Semsarian C, Puranik R, Sy RW. Longitudinal assessment of structural phenotype in Brugada syndrome using cardiac magnetic resonance imaging. Heart Rhythm O2 2023; 4:34-41. [PMID: 36713046 PMCID: PMC9877394 DOI: 10.1016/j.hroo.2022.10.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Background Despite historically being considered a channelopathy, subtle structural changes have been reported in Brugada syndrome (BrS) on histopathology and cardiac magnetic resonance (CMR) imaging. It is not known if these structural changes progress over time. Objective The study sought to assess if structural changes in BrS evolve over time with serial CMR assessment and to investigate the utility of parametric mapping techniques to identify diffuse fibrosis in BrS. Methods Patients with a diagnosis of BrS based on international guidelines and normal CMR at least 3 years prior to the study period were invited to undergo repeat CMR. CMR images were analyzed de novo and compared at baseline and follow-up. Results Eighteen patients with BrS (72% men; mean age at follow-up 47.4 ± 8.9 years) underwent serial CMR with an average of 5.0 ± 1.7 years between scans. No patients had late gadolinium enhancement (LGE) on baseline CMR, but 4 (22%) developed LGE on follow-up, typically localized to the right ventricular (RV) side of the basal septum. RV end-systolic volume increased over time (P = .04) and was associated with a trend toward reduction in RV ejection fraction (P = .07). Four patients showed a reduction in RV ejection fraction >10%. There was no evidence of diffuse myocardial fibrosis observed on parametric mapping. Conclusions Structural changes may evolve over time with development of focal fibrosis, evidenced by LGE on CMR in a significant proportion of patients with BrS. These findings have implications for our understanding of the pathological substrate in BrS and the longitudinal evaluation of patients with BrS.
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Affiliation(s)
- Julia C. Isbister
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Belinda Gray
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Sophie Offen
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Laura Yeates
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
- Centre for Population Genomics, Garvan Institute of Medical Research, University of New South Wales, Sydney, New South Wales, Australia
- Centre for Population Genomics, Murdoch Children’s Research Institute, Melbourne, Victoria, Australia
| | - Chris Naoum
- Department of Cardiology, Concord Repatriation General Hospital, Sydney, New South Wales, Australia
| | - Caroline Medi
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Hariharan Raju
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Concord Repatriation General Hospital, Sydney, New South Wales, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Christopher Semsarian
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Rajesh Puranik
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Raymond W. Sy
- Faculty of Medicine and Heath, University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
- Department of Cardiology, Concord Repatriation General Hospital, Sydney, New South Wales, Australia
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7
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Di Resta C, Berg J, Villatore A, Maia M, Pili G, Fioravanti F, Tomaiuolo R, Sala S, Benedetti S, Peretto G. Concealed Substrates in Brugada Syndrome: Isolated Channelopathy or Associated Cardiomyopathy? Genes (Basel) 2022; 13:1755. [PMID: 36292641 PMCID: PMC9602309 DOI: 10.3390/genes13101755] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 09/07/2024] Open
Abstract
Brugada syndrome (BrS) is an inherited autosomal dominant genetic disorder responsible for sudden cardiac death from malignant ventricular arrhythmia. The term "channelopathy" is nowadays used to classify BrS as a purely electrical disease, mainly occurring secondarily to loss-of-function mutations in the α subunit of the cardiac sodium channel protein Nav1.5. In this setting, arrhythmic manifestations of the disease have been reported in the absence of any apparent structural heart disease or cardiomyopathy. Over the last few years, however, a consistent amount of evidence has grown in support of myocardial structural and functional abnormalities in patients with BrS. In detail, abnormal ventricular dimensions, either systolic or diastolic dysfunctions, regional wall motion abnormalities, myocardial fibrosis, and active inflammatory foci have been frequently described, pointing to alternative mechanisms of arrhythmogenesis which challenge the definition of channelopathy. The present review aims to depict the status of the art of concealed arrhythmogenic substrates in BrS, often resulting from an advanced and multimodal diagnostic workup, to foster future preclinical and clinical research in support of the cardiomyopathic nature of the disease.
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Affiliation(s)
- Chiara Di Resta
- Genomic Unit for the Diagnosis of Human Pathologies, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
- School of Medicine, Vita-Salute San Raffaele University, 20132 Milan, Italy
| | - Jan Berg
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
| | - Andrea Villatore
- School of Medicine, Vita-Salute San Raffaele University, 20132 Milan, Italy
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
| | - Marianna Maia
- School of Medicine, Vita-Salute San Raffaele University, 20132 Milan, Italy
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
| | - Gianluca Pili
- School of Medicine, Vita-Salute San Raffaele University, 20132 Milan, Italy
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
| | - Francesco Fioravanti
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
| | - Rossella Tomaiuolo
- School of Medicine, Vita-Salute San Raffaele University, 20132 Milan, Italy
| | - Simone Sala
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
| | - Sara Benedetti
- UOC Screening Neonatale e Malattie Metaboliche, ASST Fatebenefratelli Sacco Ospedale dei Bambini “Vittore Buzzi”, 20157 Milan, Italy
| | - Giovanni Peretto
- School of Medicine, Vita-Salute San Raffaele University, 20132 Milan, Italy
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
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8
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Structural Heart Alterations in Brugada Syndrome: Is it Really a Channelopathy? A Systematic Review. J Clin Med 2022; 11:jcm11154406. [PMID: 35956023 PMCID: PMC9368908 DOI: 10.3390/jcm11154406] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 07/26/2022] [Accepted: 07/27/2022] [Indexed: 11/16/2022] Open
Abstract
Brugada syndrome (BrS) is classified as an inherited cardiac channelopathy attributed to dysfunctional ion channels and/or associated proteins in cardiomyocytes rather than to structural heart alterations. However, hearts of some BrS patients exhibit slight histologic abnormalities, suggesting that BrS could be a phenotypic variant of arrhythmogenic cardiomyopathy. We performed a systematic review of the literature following Preferred Reporting Items for Systematic Reviews and Meta-Analyses Statement (PRISMA) criteria. Our comprehensive analysis of structural findings did not reveal enough definitive evidence for reclassification of BrS as a cardiomyopathy. The collection and comprehensive analysis of new cases with a definitive BrS diagnosis are needed to clarify whether some of these structural features may have key roles in the pathophysiological pathways associated with malignant arrhythmogenic episodes.
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9
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Krahn AD, Behr ER, Hamilton R, Probst V, Laksman Z, Han HC. Brugada Syndrome. JACC Clin Electrophysiol 2022; 8:386-405. [PMID: 35331438 DOI: 10.1016/j.jacep.2021.12.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 12/09/2021] [Accepted: 12/15/2021] [Indexed: 12/15/2022]
Abstract
Brugada syndrome (BrS) is an "inherited" condition characterized by predisposition to syncope and cardiac arrest, predominantly during sleep. The prevalence is ∼1:2,000, and is more commonly diagnosed in young to middle-aged males, although patient sex does not appear to impact prognosis. Despite the perception of BrS being an inherited arrhythmia syndrome, most cases are not associated with a single causative gene variant. Electrocardiogram (ECG) findings support variable extent of depolarization and repolarization changes, with coved ST-segment elevation ≥2 mm and a negative T-wave in the right precordial leads. These ECG changes are often intermittent, and may be provoked by fever or sodium channel blocker challenge. Growing evidence from cardiac imaging, epicardial ablation, and pathology studies suggests the presence of an epicardial arrhythmic substrate within the right ventricular outflow tract. Risk stratification aims to identify those who are at increased risk of sudden cardiac death, with well-established factors being the presence of spontaneous ECG changes and a history of cardiac arrest or cardiogenic syncope. Current management involves conservative measures in asymptomatic patients, including fever management and drug avoidance. Symptomatic patients typically undergo implantable cardioverter defibrillator insertion, with quinidine and epicardial ablation used for patients with recurrent arrhythmia. This review summarizes our current understanding of BrS and provides clinicians with a practical approach to diagnosis and management.
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Affiliation(s)
- Andrew D Krahn
- Center for Cardiovascular Innovation, Heart Rhythm Services, Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada.
| | - Elijah R Behr
- Cardiovascular Clinical Academic Group and Cardiology Research Centre, St. George's, University of London and St. George's University Hospitals NHS Foundation Trust, London, United Kingdom
| | - Robert Hamilton
- Department of Pediatrics (Cardiology), The Labatt Family Heart Centre and Translational Medicine, The Hospital for Sick Children & Research Institute and the University of Toronto, Toronto, Canada
| | - Vincent Probst
- Cardiologic Department and Reference Center for Hereditary Arrhythmic Diseases, Nantes University Hospital, Nantes, France
| | - Zachary Laksman
- Center for Cardiovascular Innovation, Heart Rhythm Services, Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Hui-Chen Han
- Center for Cardiovascular Innovation, Heart Rhythm Services, Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada; Victorian Heart Institute, Monash University, Clayton, Victoria, Australia
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10
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Balla C, Mele D, Vitali F, Andreoli C, Tonet E, Sanchini M, Ferlini A, Rapezzi C, Gualandi F, Bertini M. Novel SCN5A Variant Shows Multiple Phenotypic Expression in the Same Family. CIRCULATION-GENOMIC AND PRECISION MEDICINE 2021; 14:e003481. [PMID: 34749512 PMCID: PMC8694256 DOI: 10.1161/circgen.121.003481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Cristina Balla
- Cardiological Center, S. Anna University Hospital, Ferrara. (C.B., D.M., F.V., E.T., C.R., M.B.)
| | - Daniela Mele
- Cardiological Center, S. Anna University Hospital, Ferrara. (C.B., D.M., F.V., E.T., C.R., M.B.)
| | - Francesco Vitali
- Cardiological Center, S. Anna University Hospital, Ferrara. (C.B., D.M., F.V., E.T., C.R., M.B.)
| | - Chiara Andreoli
- Cardiology Unit, San Giovanni Battista Hospital Foligno (C.A.)
| | - Elisabetta Tonet
- Cardiological Center, S. Anna University Hospital, Ferrara. (C.B., D.M., F.V., E.T., C.R., M.B.)
| | | | - Alessandra Ferlini
- Medical Genetic Logistic Unit, S. Anna University Hospital, Ferrara. (M.S., A.F., F.G.)
| | - Claudio Rapezzi
- Cardiological Center, S. Anna University Hospital, Ferrara. (C.B., D.M., F.V., E.T., C.R., M.B.).,Maria Cecilia Hospital, GVM Care & Research, Cotignola, Italy (C.R.)
| | - Francesca Gualandi
- Medical Genetic Logistic Unit, S. Anna University Hospital, Ferrara. (M.S., A.F., F.G.)
| | - Matteo Bertini
- Cardiological Center, S. Anna University Hospital, Ferrara. (C.B., D.M., F.V., E.T., C.R., M.B.)
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11
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Biventricular Myocardial Fibrosis and Sudden Death in Patients With Brugada Syndrome. J Am Coll Cardiol 2021; 78:1511-1521. [PMID: 34620408 PMCID: PMC8504200 DOI: 10.1016/j.jacc.2021.08.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/30/2021] [Accepted: 08/02/2021] [Indexed: 01/24/2023]
Abstract
BACKGROUND Electrophysiological, imaging, and pathological studies have reported the presence of subtle structural abnormalities in hearts from patients with Brugada syndrome (BrS). However, data concerning disease involvement outside of the right ventricular outflow tract are limited. OBJECTIVES This study sought to characterize the presence and distribution of ventricular myocardial fibrosis in a cohort of decedents experiencing sudden cardiac death caused by BrS. METHODS The authors evaluated 28 whole hearts from consecutive sudden cardiac death cases attributed to BrS and 29 hearts from a comparator group comprised of noncardiac deaths (control subjects). Cardiac tissue from 6 regions across the right and left ventricle were stained with Picrosirius red for collagen and tissue composition was determined using image analysis software. Postmortem genetic testing was performed in cases with DNA retained for analysis. RESULTS Of 28 BrS decedents (75% men; median age of death 25 years), death occurred in sleep or at rest in 24 of 28 (86%). The highest proportion of collagen was observed in the epicardial right ventricular outflow tract of the BrS group (23.7%; 95% CI: 20.8%-26.9%). Ventricular myocardium from BrS decedents demonstrated a higher proportion of collagen compared with control subjects (ratio 1.45; 95% CI: 1.22-1.71; P < 0.001), with no significant interactions with respect to sampling location or tissue layer. There was insufficient evidence to support differences in collagen proportion in SCN5A-positive cases (n = 5) when compared with control subjects (ratio 1.23; 95% CI: 0.75-1.43; P = 0.27). CONCLUSIONS Brugada syndrome is associated with increased collagen content throughout right and left ventricular myocardium, irrespective of sampling location or myocardial layer.
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12
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Ben-Haim Y, Asimaki A, Behr ER. Brugada syndrome and arrhythmogenic cardiomyopathy: overlapping disorders of the connexome? Europace 2021; 23:653-664. [PMID: 33200179 DOI: 10.1093/europace/euaa277] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 08/19/2020] [Indexed: 12/19/2022] Open
Abstract
Arrhythmogenic cardiomyopathy (ACM) and Brugada syndrome (BrS) are inherited diseases characterized by an increased risk for arrhythmias and sudden cardiac death. Possible overlap between the two was suggested soon after the description of BrS. Since then, various studies focusing on different aspects have been published pointing to similar findings in the two diseases. More recent findings on the structure of the cardiac cell-cell junctions may unite the pathophysiology of both diseases and give further evidence to the theory that they may in part be variants of the same disease spectrum. In this review, we aim to summarize the studies indicating the pathophysiological, genetic, structural, and electrophysiological overlap between ACM and BrS.
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Affiliation(s)
- Yael Ben-Haim
- Institute of Molecular and Clinical Sciences, St. George's University of London, Cranmer Terrace, London SW17 0RE, UK
- Cardiology Clinical Academic Group, St. George's University Hospitals NHS Foundation Trust, London, UK
| | - Angeliki Asimaki
- Institute of Molecular and Clinical Sciences, St. George's University of London, Cranmer Terrace, London SW17 0RE, UK
- Cardiology Clinical Academic Group, St. George's University Hospitals NHS Foundation Trust, London, UK
| | - Elijah R Behr
- Institute of Molecular and Clinical Sciences, St. George's University of London, Cranmer Terrace, London SW17 0RE, UK
- Cardiology Clinical Academic Group, St. George's University Hospitals NHS Foundation Trust, London, UK
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13
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Precision Medicine Approaches to Cardiac Arrhythmias: JACC Focus Seminar 4/5. J Am Coll Cardiol 2021; 77:2573-2591. [PMID: 34016268 DOI: 10.1016/j.jacc.2021.03.325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 03/31/2021] [Indexed: 12/15/2022]
Abstract
In the initial 3 papers in this Focus Seminar series, the fundamentals and key concepts of precision medicine were reviewed, followed by a focus on precision medicine in the context of vascular disease and cardiomyopathy. For the remaining 2 papers, we focus on precision medicine in the context of arrhythmias. Specifically, in this fourth paper we focus on long QT syndrome, Brugada syndrome, and atrial fibrillation. The final (fifth) paper will deal with catecholaminergic polymorphic ventricular tachycardia. These arrhythmias represent a spectrum of disease ranging from common to relatively rare, with very different genetic and environmental causative factors, and with differing clinical manifestations that range from almost no consequences to lethality in childhood or adolescence if untreated. Accordingly, the emerging precision medicine approaches to these arrhythmias vary significantly, but several common themes include increased use of genetic testing, avoidance of triggers, and personalized risk stratification to guide the use of arrhythmia-specific therapies.
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14
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Mitroi C, García-Izquierdo E, García-Lunar I, Castro-Urda V, Toquero-Ramos J, Moñivas-Palomero V, Mingo-Santos S, Cavero MA, Brugada J, Fernández-Lozano I. Right ventricular function and dyssynchrony in Brugada syndrome: Highlighting the importance of the mechanical substrate in the right ventricular outflow tract. Int J Cardiol 2021; 333:233-238. [PMID: 33727123 DOI: 10.1016/j.ijcard.2021.03.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 03/04/2021] [Accepted: 03/08/2021] [Indexed: 12/14/2022]
Abstract
BACKGROUND Current evidence suggests that Brugada syndrome (BrS), far from being a purely electrical condition, is associated with subtle mechanical abnormalities primarily affecting the right ventricle (RV). We aimed to characterize RV function in BrS and investigate the echocardiographic profile of patients with arrhythmic events, with a special focus on parameters of RV dyssynchrony using speckle-tracking echocardiography (STE). METHODS An echocardiogram was performed in 71 BrS patients and 25 healthy controls. STE was performed to assess regional and global RV mechanics, including RV outflow tract shortening (RVOTS). RVOT contraction time was considered to calculate the modified RV mechanical dispersion (RVMDm). Arrhythmic events were prospectively evaluated in the BrS cohort. RESULTS Compared to controls, BrS patients showed subtle contractile abnormalities, including impaired RV longitudinal strain, higher RV index of myocardial performance (RIMP) and lower RVOTS. BrS patients also exhibited a greater contraction delay between the lateral and the septal aspect of the RV. After a median follow-up of 7.3 year (IQR 5.2-10.8), 6 patients presented malignant arrhythmic events. RIMP >0.50, RVOTS <16.2% and RVMDm > 42 ms showed high sensitivity for the identification of BrS patients with arrhythmic events during follow-up. CONCLUSIONS Subtle RV mechanical abnormalities were present in BrS patients. RIMP and RVOTS, a novel STE-derived parameter, were found to be sensitive markers of arrhythmic events. Adding the RVOT contraction time to the analysis of RVMD may help identify patients at higher risk, reflecting the importance of the RVOT mechanical substrate in the assessment of the arrhythmic risk in BrS.
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Affiliation(s)
- Cristina Mitroi
- Cardiology Department, Hospital Universitario Puerta de Hierro, Majadahonda, Spain
| | | | - Inés García-Lunar
- Cardiology Department, Hospital Universitario Ramón y Cajal, Madrid, Spain; Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain; Centro de Investigación Biomédica en Red (CIBER) de Enfermedades Cardiovasculares, Madrid, Spain
| | - Victor Castro-Urda
- Cardiology Department, Hospital Universitario Puerta de Hierro, Majadahonda, Spain
| | - Jorge Toquero-Ramos
- Cardiology Department, Hospital Universitario Puerta de Hierro, Majadahonda, Spain
| | | | - Susana Mingo-Santos
- Cardiology Department, Hospital Universitario Puerta de Hierro, Majadahonda, Spain
| | - Miguel A Cavero
- Cardiology Department, Hospital Universitario Puerta de Hierro, Majadahonda, Spain
| | - Josep Brugada
- Institut Clínic Cardio-Vascular, Hospital Clínic, University of Barcelona, Barcelona, Spain
| | - Ignacio Fernández-Lozano
- Cardiology Department, Hospital Universitario Puerta de Hierro, Majadahonda, Spain; Centro de Investigación Biomédica en Red (CIBER) de Enfermedades Cardiovasculares, Madrid, Spain
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15
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Nademanee K, Tei C. Two Faces of Brugada Syndrome: Electrical and Structural Diseases. JACC Clin Electrophysiol 2020; 6:1364-1366. [PMID: 33121664 DOI: 10.1016/j.jacep.2020.07.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 07/01/2020] [Indexed: 11/16/2022]
Affiliation(s)
- Koonlawee Nademanee
- Faculty of Medicine, Department of Medicine, Chulalongkorn University, Bangkok, Thailand; Pacific Rim Electrophysiology Research Institute at Bumrungrad Hospital, Bangkok, Thailand; Pacific Rim Electrophysiology Research Institute, Las Vegas, Nevada, USA.
| | - Chuwa Tei
- Waon Therapy Research Institute, Tokyo, Japan
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16
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Scheirlynck E, Chivulescu M, Lie ØH, Motoc A, Koulalis J, de Asmundis C, Sieira J, Chierchia GB, Brugada P, Cosyns B, Edvardsen T, Droogmans S, Haugaa KH. Worse Prognosis in Brugada Syndrome Patients With Arrhythmogenic Cardiomyopathy Features. JACC Clin Electrophysiol 2020; 6:1353-1363. [PMID: 33121663 DOI: 10.1016/j.jacep.2020.05.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 04/27/2020] [Accepted: 05/20/2020] [Indexed: 11/27/2022]
Abstract
OBJECTIVES This study aimed to assess the presence of echocardiographic and electrocardiographic similarities in patients with Brugada syndrome (BrS) and arrhythmogenic cardiomyopathy (AC) and the prevalence and prognostic value of AC structural/electrical features in patients with BrS. BACKGROUND BrS and AC are genetic cardiac diseases with high risk for sudden cardiac death. Although BrS and AC display different features, previous reports suggest a phenotypic overlap. METHODS We acquired clinical data, electrocardiogram, and transthoracic echocardiography in patients with BrS and AC. We assessed the presence of AC diagnostic criteria according to the 2010 AC task force criteria for right ventricular outflow tract (RVOT), fractional area change, depolarization, and repolarization in the patients with BrS. We compared arrhythmic outcome in BrS patients with and without AC structural/electrical criteria. RESULTS A total of 116 BrS and 141 AC patients were included. AC electrical features were present in 28 (24%) BrS patients and structural features in 97 (84%) BrS patients. BrS patients with an RVOT or depolarization AC criterion showed a trend towards worse severe arrhythmia-free survival compared to BrS patients without (p = 0.05). The criterion for RVOT dilation showed high sensitivity and improved detection of arrhythmic BrS patients when added to type 1 electrocardiogram pattern and syncope (area under the curve 0.73 [95% confidence interval: 0.59 to 0.87] vs. area under the curve 0.79 [95% confidence interval: 0.69 to 0.90]); p = 0.009). CONCLUSIONS In this large cohort comparison, Brugada syndrome (BrS) and arrhythmogenic cardiomyopathy patients had phenotypic overlap. The presence of arrhythmogenic cardiomyopathy diagnostic criteria in BrS patients was associated with a trend towards higher arrhythmic risk. The right ventricular outflow tract dilation criterion improved detection of arrhythmic BrS patients.
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Affiliation(s)
- Esther Scheirlynck
- Centrum voor Hart-en Vaatziekten, Universitair Ziekenhuis Brussel- Vrije Universiteit Brussel, Brussels, Belgium
| | - Monica Chivulescu
- Department of Cardiology, Oslo University Hospital, Rikshospitalet-Institute for Clinical Medicine, University of Oslo, Oslo, Norway
| | - Øyvind H Lie
- Department of Cardiology, Oslo University Hospital, Rikshospitalet-Institute for Clinical Medicine, University of Oslo, Oslo, Norway
| | - Andreea Motoc
- Centrum voor Hart-en Vaatziekten, Universitair Ziekenhuis Brussel- Vrije Universiteit Brussel, Brussels, Belgium
| | - Jorgos Koulalis
- Centrum voor Hart-en Vaatziekten, Universitair Ziekenhuis Brussel- Vrije Universiteit Brussel, Brussels, Belgium
| | - Carlo de Asmundis
- Heart Rhythm Management Center, Centrum voor Hart-en Vaatziekten Universitair Ziekenhuis Brussel -Vrije Universiteit Brussel, Postgraduate program in Cardiac Electrophysiology and Pacing, European Reference Network GUARD-Heart, Brussels, Belgium
| | - Juan Sieira
- Heart Rhythm Management Center, Centrum voor Hart-en Vaatziekten Universitair Ziekenhuis Brussel -Vrije Universiteit Brussel, Postgraduate program in Cardiac Electrophysiology and Pacing, European Reference Network GUARD-Heart, Brussels, Belgium
| | - Gian-Battista Chierchia
- Heart Rhythm Management Center, Centrum voor Hart-en Vaatziekten Universitair Ziekenhuis Brussel -Vrije Universiteit Brussel, Postgraduate program in Cardiac Electrophysiology and Pacing, European Reference Network GUARD-Heart, Brussels, Belgium
| | - Pedro Brugada
- Heart Rhythm Management Center, Centrum voor Hart-en Vaatziekten Universitair Ziekenhuis Brussel -Vrije Universiteit Brussel, Postgraduate program in Cardiac Electrophysiology and Pacing, European Reference Network GUARD-Heart, Brussels, Belgium
| | - Bernard Cosyns
- Centrum voor Hart-en Vaatziekten, Universitair Ziekenhuis Brussel- Vrije Universiteit Brussel, Brussels, Belgium
| | - Thor Edvardsen
- Heart Rhythm Management Center, Centrum voor Hart-en Vaatziekten Universitair Ziekenhuis Brussel -Vrije Universiteit Brussel, Postgraduate program in Cardiac Electrophysiology and Pacing, European Reference Network GUARD-Heart, Brussels, Belgium
| | - Steven Droogmans
- Centrum voor Hart-en Vaatziekten, Universitair Ziekenhuis Brussel- Vrije Universiteit Brussel, Brussels, Belgium
| | - Kristina H Haugaa
- Department of Cardiology, Oslo University Hospital, Rikshospitalet-Institute for Clinical Medicine, University of Oslo, Oslo, Norway.
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17
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Isbister J, Semsarian C. Sudden cardiac death: an update. Intern Med J 2020; 49:826-833. [PMID: 31295785 DOI: 10.1111/imj.14359] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 04/11/2019] [Accepted: 04/16/2019] [Indexed: 01/15/2023]
Abstract
Sudden cardiac death (SCD) is a devastating and all too common result of both acquired and genetic heart diseases. The profound sadness endured by families is compounded by the risk many of these deaths confer upon surviving relatives. For those with known cardiac disease, disease-specific therapy and risk stratification are key to reducing sudden death. For families of a SCD victim, uncovering a definitive cause of death can help relieve the agonising uncertainty and is a vital first step in screening surviving relatives and instituting therapy to reduce SCD risk. Increasing knowledge about the molecular mechanisms and genetic drivers of malignant arrhythmias in the diverse clinical entities that can cause SCD is vital if we are to optimise risk stratification and personalise patient care. Advances in diagnostic tools, disease-specific therapy and defibrillator technology are improving outcomes for patients and their families but there is still much progress to be made.
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Affiliation(s)
- Julia Isbister
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, The University of Sydney, Sydney, New South Wales, Australia.,Faculty of Medicine and Heath, The University of Sydney, Sydney, New South Wales, Australia
| | - Christopher Semsarian
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, The University of Sydney, Sydney, New South Wales, Australia.,Faculty of Medicine and Heath, The University of Sydney, Sydney, New South Wales, Australia.,Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
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18
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Isbister JC, Krahn AD, Semsarian C, Sy RW. Brugada Syndrome: Clinical Care Amidst Pathophysiological Uncertainty. Heart Lung Circ 2020; 29:538-546. [PMID: 31959551 DOI: 10.1016/j.hlc.2019.11.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 11/14/2019] [Accepted: 11/25/2019] [Indexed: 12/11/2022]
Abstract
Brugada syndrome (BrS) is a complex clinical entity with ongoing conjecture regarding its genetic basis, underlying pathophysiology, and clinical management. Within this paradigm of uncertainty, clinicians are faced with the challenge of caring for patients with this uncommon but potentially fatal condition. This article reviews the current understanding of BrS and highlights the "known unknowns" to reinforce the need for flexible clinical practice in parallel with ongoing scientific discovery.
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Affiliation(s)
- Julia C Isbister
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, University of Sydney, Sydney, NSW, Australia; Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia; Department of Cardiology, Royal Prince Alfred Hospital, Sydney, NSW, Australia
| | - Andrew D Krahn
- Division of Cardiology, University of British Columbia, Vancouver, Canada
| | - Christopher Semsarian
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, University of Sydney, Sydney, NSW, Australia; Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia; Department of Cardiology, Royal Prince Alfred Hospital, Sydney, NSW, Australia
| | - Raymond W Sy
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia; Department of Cardiology, Royal Prince Alfred Hospital, Sydney, NSW, Australia.
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19
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Contraction alterations in Brugada syndrome; association with life-threatening ventricular arrhythmias. Int J Cardiol 2020; 299:147-152. [DOI: 10.1016/j.ijcard.2019.06.074] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 06/12/2019] [Accepted: 06/27/2019] [Indexed: 01/15/2023]
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20
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Pappone C, Mecarocci V, Manguso F, Ciconte G, Vicedomini G, Sturla F, Votta E, Mazza B, Pozzi P, Borrelli V, Anastasia L, Micaglio E, Locati E, Monasky MM, Lombardi M, Calovic Z, Santinelli V. New electromechanical substrate abnormalities in high-risk patients with Brugada syndrome. Heart Rhythm 2019; 17:637-645. [PMID: 31756528 DOI: 10.1016/j.hrthm.2019.11.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND The relationship between the typical electrocardiographic pattern and electromechanical abnormalities has never been systematically explored in Brugada syndrome (BrS). OBJECTIVES The aims of this study were to characterize the electromechanical substrate in patients with BrS and to evaluate the relationship between electrical and mechanical abnormalities. METHODS We enrolled 50 consecutive high-risk patients with BrS (mean age 42 ± 7.2 years), with implantable cardioverter-defibrillator implantation for primary or secondary prevention of ventricular tachyarrhythmias (ventricular tachycardia/ventricular fibrillation [VT/VF]), undergoing substrate mapping and ablation. Patients underwent 3-dimensional (3D) echocardiography with 3D wall motion/deformation quantification and electroanatomic mapping before and after ajmaline administration (1 mg/kg in 5 minutes); 3D mechanical changes were compared with 50 age- and sex-matched controls. The effect of substrate ablation on electromechanical abnormalities was also assessed. RESULTS In all patients, ajmaline administration induced Brugada type 1 pattern, with a significant increase in the electrical substrate (P < .001), particularly in patients with previous spontaneous VT/VF (P = .007). Induction of Brugada pattern was associated with lowering of right ventricular (RV) ejection fraction (P < .001) and worsening of 3D RV mechanical function (P < .001), particularly in the anterior free wall of the RV outflow tract, without changes in controls. RV electrical and mechanical abnormalities were highly correlated (r = 0.728, P < .001). By multivariate analysis, only the area of RV dysfunction was an independent predictor of spontaneous VT/VF (odds ratio 1.480; 95% confidence interval 1.159-1.889; P = .002). Substrate ablation abolished both BrS-electrocardiographic pattern and mechanical abnormalities, despite ajmaline rechallenge. CONCLUSION BrS is an electromechanical disease affecting the RV. The typical BrS pattern reflects an extensive RV arrhythmic substrate, driving consistent RV mechanical abnormalities. Substrate ablation abolished both Brugada pattern and mechanical abnormalities.
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Affiliation(s)
- Carlo Pappone
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy.
| | - Valerio Mecarocci
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Francesco Manguso
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Giuseppe Ciconte
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Gabriele Vicedomini
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Francesco Sturla
- Computer Simulation Laboratory, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Emiliano Votta
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milan, Italy
| | - Beniamino Mazza
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Paolo Pozzi
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Valeria Borrelli
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Luigi Anastasia
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy
| | - Emanuele Micaglio
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Emanuela Locati
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Michelle M Monasky
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Massimo Lombardi
- Department of Cardiovascular Imaging, Policlinico San Donato, San Donato Milanese, Italy
| | - Zarko Calovic
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Vincenzo Santinelli
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Italy
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21
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Speckle tracking echocardiography data in Brugada syndrome patients. Data Brief 2019; 25:104330. [PMID: 31453301 PMCID: PMC6700482 DOI: 10.1016/j.dib.2019.104330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 07/18/2019] [Accepted: 07/22/2019] [Indexed: 11/22/2022] Open
Abstract
Brugada syndrome is characterized by typical electrocardiogram changes and a high risk for sudden cardiac death (Priori et al., 2013). In addition to the well known electrical substrate, morphological and functional alterations appeared to be present in a subset of the Brugada syndrome patients (Catalano et al., 2009). Echocardiographic speckle tracking enables us to detect subtle contraction alterations (Smiseth et al.,2016). We performed transthoracic echocardiography with speckle tracking analysis in 82 healthy controls and 175 Brugada syndrome patients. Main findings are presented and discussed in the article “Contraction alterations in Brugada syndrome; association with life-threatening ventricular arrhythmias” (Scheirlynck et al., 2019). This related Data article contains segmental longitudinal strain values for RV and LV, and the comparison of echocardiographic parameters between Brugada syndrome patients with spontaneous and drug-induced type 1 pattern and between patients with and without ventricular arrhythmia inducibility during electrophysiological study.
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22
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Pieroni M, Notarstefano P, Oliva A, Campuzano O, Santangeli P, Coll M, Nesti M, Carnevali A, Fraticelli A, Iglesias A, Grassi S, Brugada R, Bolognese L. Electroanatomic and Pathologic Right Ventricular Outflow Tract Abnormalities in Patients With Brugada Syndrome. J Am Coll Cardiol 2018; 72:2747-2757. [PMID: 30497561 DOI: 10.1016/j.jacc.2018.09.037] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 08/22/2018] [Accepted: 09/01/2018] [Indexed: 10/27/2022]
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