Aortic stenosis medical therapy

Aortic Stenosis Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editors-In-Chief:Mohammed A. Sbeih, M.D. [2]; Cafer Zorkun, M.D.; Assistant Editor-In-Chief: Kristin Feeney, B.S. [3]

Overview

While medical therapy may improve the symptoms of patients with aortic stenosis, medical therapy does not prolong life expectancy. Aortic valve replacement remains the definitive treatment of symptomatic aortic stenosis and it improves both the symptoms and life expectancy of patients with aortic stenosis. When pharmacological therapies are used, extreme caution must be exercised in the administration of vasodilators as excess vasodilation may lead to hypotension, a reduction in perfusion pressure to the heart, a further decline in cardiac output and further hypotension. This downward spiral can be fatal and must be avoided at all costs.

Lipid-Lowering

• More rapid progression of aortic stenosis has been associated with traditional risk factors for atherosclerosis. Based on the similarities that exist between calcific aortic stenosis and atherosclerosis in terms of their pathological features and risk factors, there has been a substantial interest to modify the progression of calcific aortic stenosis with the administration of cholesterol lowering agents such as statins.

• Although a number of small, observational studies demonstrated an association between low cholesterol levels and decreased progression, and even regression of calcific aortic stenosis. Administration of rosuvastatin has been associated with a slowing of aortic stenosis progression .

Vasodilators

Extreme care should be taken to avoid excess vasodilation in the patient with critical aortic stenosis which could precipitate a downward spiral of low forward output, impaired subendocardial perfusion, ischemia and further reduction in forward output.

• Nitroglycerin is helpful in relieving angina pectoris symptoms but should be used cautiously to avoid hypotention and excess vasodilation.

Diuretics

Diuretics should be administered cautiously to avoid dehydration, hypovolemia and a significant reduction in cardiac output.

Other Therapies

• Beta blockers and angiotensin-converting enzyme inhibitors are generally safe for asymptomatic patients with preserved left ventricular systolic function.

Na Restriction

• If the patient has symptoms of heart failure, the patient should be placed on sodium restriction.