A primer on arrhythmias in patients with hypertrophic cardiomyopathy

Area of Science:

• Cardiology
• Electrophysiology
• Genetics

Background:

• Patients with hypertrophic cardiomyopathy (HCM) are prone to atrial and ventricular arrhythmias.
• Treatment for HCM-related arrhythmias often relies on extrapolations from other cardiac diseases.
• Heart block is observed spontaneously and more frequently after septal reduction therapy in HCM patients.

Purpose of the Study:

• To review the spectrum of arrhythmias in hypertrophic cardiomyopathy.
• To identify risk factors for sudden cardiac death in HCM patients.
• To discuss the clinical implications of arrhythmias, particularly atrial fibrillation, in HCM.

Main Methods:

• Literature review of studies on arrhythmias in hypertrophic cardiomyopathy.
• Analysis of risk factors for sudden cardiac death (SCD) in HCM.
• Synthesis of current understanding of arrhythmia management in HCM.

Main Results:

• Atrial fibrillation is the most common arrhythmia in HCM, often leading to functional decline.
• Sudden cardiac death is a primary cause of mortality in young HCM patients and contributes to deaths in older patients.
• Major SCD risk factors include prior cardiac arrest, severe hypertrophy, syncope, and family history; minor factors include non-sustained ventricular tachycardia and exercise-induced hypotension.

Conclusions:

• Arrhythmias, especially atrial fibrillation and sudden cardiac death, pose significant risks in hypertrophic cardiomyopathy.
• Established and emerging risk factors for sudden cardiac death require careful consideration in HCM management.
• There is a critical need for evidence-based treatment strategies tailored to arrhythmias in hypertrophic cardiomyopathy patients.