Resetting The Rhythm: Rethinking Implantable Cardioverter Defibrillators From A Left Ventricular Non-compaction Perspective

Abstract

Introduction

Left Ventricular Non-Compaction (LVNC) is identified as a unique cardiomyopathy, marked by excessive trabeculation in the left ventricle due to arrested myocardial embryogenesis. Its prevalence, estimated through cardiac MRI, varies from 0.014% to 1.3% in the general population, suggesting it may often go undiagnosed. Our study examines the decision-making for implantable cardioverter defibrillator (ICD) placement in LVNC patients with normal Ejection Fraction (EF), aiming to refine treatment strategies and understanding of managing LVNC with preserved systolic function.

Case

A 25-year-old woman experiencing palpitations consulted an advanced heart failure clinic, considering ICD placement. Holter monitoring revealed occasional premature ventricular contractions and a short episode of non-sustained ventricular tachycardia (NSVT). Further imaging through echocardiography and MRI showed LVNC characteristics with a compacted:non-compacted end-diastolic ratio of >2.3:1. Notably, she had a normal EF. Given she did not meet the end-systolic noncompaction criterion, ICD placement was deferred, with recommendations to pursue genetic testing for evaluation of possible pathognomonic genotypes first.

Discussion

Our case report delves into the complex decision of whether to implement an ICD in a patient with LVNC but normal EF who exhibited NSVT. This patient profile challenges conventional protocols that primarily associate arrhythmia risks predominantly with systolic dysfunction, thereby questioning the necessity and timing of ICD placement. The discussion pivots on how to balance the benefits of ICD placement against potential risks in patients with no systolic impairment but with arrhythmic episodes, emphasizing the importance of a personalized, informed approach to ICD decision-making. While calling for a reevaluation of management strategies for LVNC, our exploration adds to the growing dialogue on optimizing care for LVNC patients by ensuring decisions about ICD implantation are grounded in a comprehensive understanding of individual patient risks and benefits. Additionally, it highlights a significant gap in the literature, especially concerning ICD placement in LVNC patients with preserved EF and arrhythmias, underlining the urgent need for further research. This lack of detailed studies challenges clinicians to make informed decisions with limited evidence, emphasizing the critical need for more focused research to develop effective, nuanced management strategies for this unique patient population.