Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease

Abstract Background Conduction system disease may represent an early manifestation of underlying structural heart disease, including infiltrative disorders. Timely diagnosis of underlying cardiomyopathy has significant implications for clinical management, guiding both disease‐modifying medical ther...

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Main Authors: Jeremy William, Haider Muthana, Joseph Hogarty, Andrew Taylor, James L. Hare, Justin Mariani, Hitesh Patel, Geoff Wong, Dion Stub, David M. Kaye, Sandeep Prabhu, Peter M. Kistler, Aleksandr Voskoboinik
Format: Article
Language:English
Published: Wiley 2025-08-01
Series:Journal of Arrhythmia
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Online Access:https://doi.org/10.1002/joa3.70109
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author Jeremy William
Haider Muthana
Joseph Hogarty
Andrew Taylor
James L. Hare
Justin Mariani
Hitesh Patel
Geoff Wong
Dion Stub
David M. Kaye
Sandeep Prabhu
Peter M. Kistler
Aleksandr Voskoboinik
author_facet Jeremy William
Haider Muthana
Joseph Hogarty
Andrew Taylor
James L. Hare
Justin Mariani
Hitesh Patel
Geoff Wong
Dion Stub
David M. Kaye
Sandeep Prabhu
Peter M. Kistler
Aleksandr Voskoboinik
author_sort Jeremy William
collection DOAJ
description Abstract Background Conduction system disease may represent an early manifestation of underlying structural heart disease, including infiltrative disorders. Timely diagnosis of underlying cardiomyopathy has significant implications for clinical management, guiding both disease‐modifying medical therapy and decisions around device implantation. Objective We sought to investigate the utility of cardiac magnetic resonance imaging (CMR) in patients with conduction system disease and preserved LV function on echocardiography. Methods We evaluated all patients undergoing CMR between 2005 and 2023 at our institution for the investigation of advanced conduction system disease (complete heart block, Mobitz II block, or bifascicular block). We excluded patients with known systolic heart failure (LVEF<50%) prior to CMR. We evaluated the prevalence of CMR‐detected myocardial fibrosis and infiltrative cardiomyopathy in this cohort. Results One hundred nineteen patients were identified (mean age 49 ± 15 years, 52% male). Complete heart block was the most common indication (50%), followed by bifascicular block (27%) and Mobitz II block (23%). Mean LVEF on echocardiography prior to CMR was 60.0 ± 3.1%. CMR‐detected late gadolinium enhancement (LGE) was present in 32/119 patients (26.9%). Cardiac sarcoid was the most common final diagnosis (n = 19, 16%), of whom only five (26%) had known extracardiac sarcoid prior to CMR. Cardiac fibrosis was observed in a similar proportion of patients across the three subtypes of conduction disease studied (p = 0.47). Conclusion Cardiac fibrosis is present in a substantial proportion of patients undergoing CMR for the investigation of conduction disease, even when LV function appears preserved on echocardiography. Cardiac MRI may be an important adjunctive tool for the investigation of conduction disease, particularly in younger patients.
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spelling doaj-art-ada7782d97664047be90ec21faf87e792025-08-26T10:38:54ZengWileyJournal of Arrhythmia1880-42761883-21482025-08-01414n/an/a10.1002/joa3.70109Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system diseaseJeremy William0Haider Muthana1Joseph Hogarty2Andrew Taylor3James L. Hare4Justin Mariani5Hitesh Patel6Geoff Wong7Dion Stub8David M. Kaye9Sandeep Prabhu10Peter M. Kistler11Aleksandr Voskoboinik12The Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaRoyal Melbourne Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaThe Alfred Hospital Melbourne AustraliaAbstract Background Conduction system disease may represent an early manifestation of underlying structural heart disease, including infiltrative disorders. Timely diagnosis of underlying cardiomyopathy has significant implications for clinical management, guiding both disease‐modifying medical therapy and decisions around device implantation. Objective We sought to investigate the utility of cardiac magnetic resonance imaging (CMR) in patients with conduction system disease and preserved LV function on echocardiography. Methods We evaluated all patients undergoing CMR between 2005 and 2023 at our institution for the investigation of advanced conduction system disease (complete heart block, Mobitz II block, or bifascicular block). We excluded patients with known systolic heart failure (LVEF<50%) prior to CMR. We evaluated the prevalence of CMR‐detected myocardial fibrosis and infiltrative cardiomyopathy in this cohort. Results One hundred nineteen patients were identified (mean age 49 ± 15 years, 52% male). Complete heart block was the most common indication (50%), followed by bifascicular block (27%) and Mobitz II block (23%). Mean LVEF on echocardiography prior to CMR was 60.0 ± 3.1%. CMR‐detected late gadolinium enhancement (LGE) was present in 32/119 patients (26.9%). Cardiac sarcoid was the most common final diagnosis (n = 19, 16%), of whom only five (26%) had known extracardiac sarcoid prior to CMR. Cardiac fibrosis was observed in a similar proportion of patients across the three subtypes of conduction disease studied (p = 0.47). Conclusion Cardiac fibrosis is present in a substantial proportion of patients undergoing CMR for the investigation of conduction disease, even when LV function appears preserved on echocardiography. Cardiac MRI may be an important adjunctive tool for the investigation of conduction disease, particularly in younger patients.https://doi.org/10.1002/joa3.70109cardiac MRIconduction diseasefibrosisinfiltrative cardiomyopathy
spellingShingle Jeremy William
Haider Muthana
Joseph Hogarty
Andrew Taylor
James L. Hare
Justin Mariani
Hitesh Patel
Geoff Wong
Dion Stub
David M. Kaye
Sandeep Prabhu
Peter M. Kistler
Aleksandr Voskoboinik
Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease
Journal of Arrhythmia
cardiac MRI
conduction disease
fibrosis
infiltrative cardiomyopathy
title Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease
title_full Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease
title_fullStr Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease
title_full_unstemmed Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease
title_short Prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease
title_sort prevalence of cardiac fibrosis and infiltrative cardiomyopathy in patients with advanced conduction system disease
topic cardiac MRI
conduction disease
fibrosis
infiltrative cardiomyopathy
url https://doi.org/10.1002/joa3.70109
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