Which medication is the treatment of choice for symptomatic patients with hypertrophic cardiomyopathy?

Which medication is the treatment of choice for symptomatic patients with hypertrophic cardiomyopathy?

• A. Calcium channel blockers
• B. Beta-blockers
• C. Nitrates
• D. Thiazide diuretics

Answer: (B)

Symptomatic obstructive hypertrophic cardiomyopathy improves best when the LV outflow tract obstruction is reduced by lowering heart rate and contractility. Beta-blockers slow the heart rate and weaken the force of contraction, which lengthens diastole and decreases the systolic anterior motion of the mitral valve toward the septum. This lowers the dynamic gradient across the outflow tract, improves ventricular filling, and relieves symptoms like chest pain and shortness of breath. Nitrates and diuretics lower preload, which tends to widen or worsen the obstruction by reducing LV cavity size and increasing the gradient, so they’re not preferred in this setting. Calcium channel blockers can be used if beta-blockers aren’t tolerated, but beta-blockers are typically first-line due to their stronger and more consistent effect on the obstruction and symptoms. If symptoms persist despite optimized medical therapy, more invasive options may be considered.

Symptomatic obstructive hypertrophic cardiomyopathy improves best when the LV outflow tract obstruction is reduced by lowering heart rate and contractility. Beta-blockers slow the heart rate and weaken the force of contraction, which lengthens diastole and decreases the systolic anterior motion of the mitral valve toward the septum. This lowers the dynamic gradient across the outflow tract, improves ventricular filling, and relieves symptoms like chest pain and shortness of breath. Nitrates and diuretics lower preload, which tends to widen or worsen the obstruction by reducing LV cavity size and increasing the gradient, so they’re not preferred in this setting. Calcium channel blockers can be used if beta-blockers aren’t tolerated, but beta-blockers are typically first-line due to their stronger and more consistent effect on the obstruction and symptoms. If symptoms persist despite optimized medical therapy, more invasive options may be considered.