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Can sudden cardiac death be prevented?
1Hypertrophic Cardiomyopathy Center, Minneapolis Heart Institute Foundation, Minneapolis, MN 55407, USA. hcm.maron@mhif.org
Insights
Implantable cardioverter-defibrillators offer proven protection against sudden cardiac death in hypertrophic cardiomyopathy patients. Identifying candidates requires careful risk assessment and physician judgment for effective prophylactic therapy.
Area of Science:
- Cardiology
- Genetics
- Preventive Medicine
Background:
- Hypertrophic cardiomyopathy (HCM) is a leading cause of sudden cardiac death (SCD) in young individuals, including athletes.
- Implantable cardioverter-defibrillators (ICDs) represent a significant advancement in managing HCM, offering protection against SCD.
- The heterogeneity of HCM and challenges in risk stratification complicate the selection of appropriate candidates for prophylactic ICD therapy.
Purpose of the Study:
- To evaluate the role and challenges of implantable cardioverter-defibrillators in preventing sudden cardiac death in hypertrophic cardiomyopathy.
- To discuss the current strategies for identifying high-risk patients eligible for prophylactic ICD implantation.
- To highlight the impact of ICDs on the natural history and longevity of hypertrophic cardiomyopathy patients.
Main Methods:
- Review of current clinical practice and risk stratification algorithms for hypertrophic cardiomyopathy.
- Analysis of the effectiveness of implantable cardioverter-defibrillators in terminating life-threatening arrhythmias.
- Consideration of challenges in prospective, randomized trials for prophylactic ICD therapy in HCM.
Main Results:
- Implantable cardioverter-defibrillators are the only proven method to terminate ventricular tachycardia/fibrillation, thus preventing sudden death in HCM.
- Despite complexities in risk stratification, a combination of risk factor algorithms and physician judgment effectively identifies high-risk patients.
- ICDs alter the natural history of HCM, offering potential for normal longevity in many patients.
Conclusions:
- Prophylactic ICD implantation is a crucial, though challenging, component of hypertrophic cardiomyopathy management.
- Effective identification of at-risk individuals is paramount for successful ICD therapy.
- ICDs have transformed the prognosis for many patients with hypertrophic cardiomyopathy, reducing mortality from sudden cardiac death.
Abstract:
Hypertrophic cardiomyopathy is regarded as the most common cause of sudden cardiac death in young people (including trained athletes). Introduction of implantable cardioverter-defibrillators to the hypertrophic cardiomyopathy patient population represents a new paradigm for clinical practice and perhaps the most significant advance in the management of this disease to date. Implantable defibrillators offer the only proven protection against sudden death by virtue of effectively terminating ventricular tachycardia/fibrillation and, in the process, altering the natural history of hypertrophic cardiomyopathy and providing the potential opportunity of normal or near-normal longevity for many patients. However, targeting the most appropriate candidates for prophylactic device therapy can be complex, compounded by the unpredictability of the underlying arrhythmogenic substrate, absence of a single dominant and quantitative risk marker in this heterogeneous disease, and the historical difficulty in assembling sufficiently powered prospective and randomized trials in large patient populations. Nevertheless, the current risk factor algorithm, when combined with a measure of individual physician judgment, is an effective strategy for identifying high-risk patients. Indeed, prevention of sudden death has now become an integral, albeit challenging, component of overall hypertrophic cardiomyopathy management.
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