Which medication may improve symptoms in patients with aortic stenosis who are not surgical candidates?

Which medication may improve symptoms in patients with aortic stenosis who are not surgical candidates?

• A. ACE inhibitors
• B. Digoxin
• C. Nifedipine
• D. Diuretics

Answer: (A)

In aortic stenosis, the left ventricle must generate high pressure to push blood through a narrowed valve, so the issue is a fixed afterload. Medications that reduce afterload can improve forward flow and lessen symptoms when valve replacement isn’t an option. ACE inhibitors do this by dilating the systemic circulation, lowering afterload, which can improve cardiac output and relieve dyspnea or exercise intolerance in patients who cannot undergo surgery, provided blood pressure can be kept in a safe range and renal function monitored. Other options either don’t improve forward flow as effectively or can worsen the situation in fixed outflow. Diuretics may relieve congestion but reduce preload and can further decrease stroke volume. Digoxin is not primarily used to improve symptoms by afterload reduction and is more limited to rate control or in cases with systolic dysfunction. Nitrates or certain calcium channel blockers can cause dangerous hypotension because the stiff valve relies on higher elevated pressures to maintain perfusion, so they’re generally avoided in symptomatic AS.

In aortic stenosis, the left ventricle must generate high pressure to push blood through a narrowed valve, so the issue is a fixed afterload. Medications that reduce afterload can improve forward flow and lessen symptoms when valve replacement isn’t an option. ACE inhibitors do this by dilating the systemic circulation, lowering afterload, which can improve cardiac output and relieve dyspnea or exercise intolerance in patients who cannot undergo surgery, provided blood pressure can be kept in a safe range and renal function monitored.

Other options either don’t improve forward flow as effectively or can worsen the situation in fixed outflow. Diuretics may relieve congestion but reduce preload and can further decrease stroke volume. Digoxin is not primarily used to improve symptoms by afterload reduction and is more limited to rate control or in cases with systolic dysfunction. Nitrates or certain calcium channel blockers can cause dangerous hypotension because the stiff valve relies on higher elevated pressures to maintain perfusion, so they’re generally avoided in symptomatic AS.