Supravalvular aortic stenosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Supravalvular aortic stenosis is the most uncommon cause of left ventricular outflow tract obstruction (LVOT) accounting for 8% of congenital cases of LVOT obstruction.

Pathophysiology

1. Obstruction occurs just above the coronary ostium at the level of the sinotubular junction:
   • Hourglass type (the most common)
   • Hypoplastic type: uniform narrowing of the ascending aorta.
2. Associated lesion is peripheral pulmonary arterial stenosis
3. Because of high perfusion pressure of the coronary arteries there is premature coronary artery disease.
4. Coronary arteries may be obstructed by an adjacent stenotic ring.

Genetics

1. One third of cases are transmitted as an autosomal dominant trait.

Diagnosis

Physical Examination

1. 50% have a characteristically greater pulse and systolic blood pressure in the right carotid and brachial arteries than in the left.
2. The systolic murmur is maximal below the right clavicle and radiates primarily to the right carotid artery.
3. No ejection click is present, no diastolic murmur.

Echocardiography

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