ACCSAP CCKE Coronary Artery Disease (CAD) Risk Stratification And Prevention Practice Test

Which of the following is NOT a mechanical therapy option for hypertrophic obstructive cardiomyopathy?

Dual-chamber pacing Alcohol septal ablation Beta-blocker therapy Open surgical myectomy

Correct Answer:

Beta-blocker therapy

Explanation:

In hypertrophic obstructive cardiomyopathy, mechanical therapies are those that physically modify the outflow tract or septal anatomy. Dual-chamber pacing can alter the contraction sequence to reduce the LVOT gradient, alcohol septal ablation creates a controlled infarct to thin the septum, and open surgical myectomy surgically removes thickened septal tissue. Beta-blocker therapy is pharmacologic, aiming to reduce heart rate and contractility to lessen obstruction but it does not change the anatomy or physically relieve the obstruction. Therefore, beta-blocker therapy is not a mechanical treatment.

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