Disease penetrance and risk stratification for sudden cardiac death in asymptomatic hypertrophic cardiomyopathy...

Area of Science:

• Cardiology
• Genetics
• Preventive Medicine

Background:

• Hypertrophic cardiomyopathy (HCM) is a genetic heart condition.
• Asymptomatic mutation carriers are at risk for developing HCM and sudden cardiac death (SCD).
• Predictive DNA testing identifies individuals carrying HCM-associated gene mutations.

Purpose of the Study:

• To assess cardiac outcomes in asymptomatic carriers of HCM mutations.
• To evaluate risk stratification for sudden cardiac death (SCD) in this population.
• To understand disease penetrance and identify associated risk factors.

Main Methods:

• Cardiac evaluation of 76 HCM mutation carriers from 32 families.
• Methods included history, physical examination, ECG, Doppler echocardiography, exercise testing, and Holter monitoring.
• Diagnosis of HCM used established criteria for affected families.

Main Results:

• Hypertrophic cardiomyopathy (HCM) was diagnosed in 41% of carriers.
• Disease penetrance was age-dependent, with men more frequently affected.
• Myosin Binding Protein C (MYBPC3) mutation carriers were diagnosed at a higher age than Myosin Heavy Chain (MYH7) carriers.
• Risk factors for sudden cardiac death (SCD) were identified in both HCM-affected and unaffected carriers.

Conclusions:

• HCM is diagnosed in a significant proportion of asymptomatic carriers.
• Age-dependent penetrance underscores the need for regular cardiologic evaluations.
• Risk factors for SCD exist irrespective of HCM diagnosis, highlighting the importance of comprehensive risk assessment.