Morphologic features of exertional versus nonexertional sudden death in patients with hypertrophic cardiomyopathy

Area of Science:

• Cardiovascular Pathology
• Sudden Cardiac Death
• Hypertrophic Cardiomyopathy

Background:

• Hypertrophic cardiomyopathy (HC) is a leading cause of sudden cardiac death, particularly in young individuals.
• Pathologic features differentiating exertional versus nonexertional sudden deaths in HC are not well-established.
• Understanding these differences is crucial for risk stratification and prevention strategies.

Purpose of the Study:

• To investigate and compare the pathologic features of hypertrophic cardiomyopathy in sudden deaths related to exertion versus nonexertional events.
• To identify specific pathological characteristics associated with exertional sudden death in HC.
• To correlate autopsy findings with clinical data for a comprehensive analysis.

Main Methods:

• Analysis of gross measurements and histologic findings from 103 autopsy cases of hypertrophic cardiomyopathy.
• Comparison of pathologic features between 71 sudden deaths, categorized as exertional or nonexertional.
• Multivariate analysis to determine significant associations with exertional sudden death.

Main Results:

• Sudden deaths due to exertion occurred at a significantly younger age (27 years) compared to nonexertional deaths (40 years).
• Exertional deaths were more prevalent in women, while nonexertional deaths occurred more frequently at rest.
• Decreased mean heart weight and male gender were significantly associated with exertional sudden death in HC.

Conclusions:

• No specific pathologic features definitively identify hypertrophic cardiomyopathy patients at risk for exertional sudden death.
• Relatively decreased heart weight is a strong indicator for exertional sudden death in HC.
• Cardiologists should consider HC in athletes with mild cardiomegaly, especially young men, even without significant asymmetry.