Second natural history study of congenital heart defects. Results of treatment of patients with aortic valvar stenosis.

Abstract

Patients with gradients < 25 mm Hg can be followed medically; however, progressive stenosis can occur, and approximately 20% will require intervention. If the gradient is > or = 50 mm Hg, there is a risk of serious arrhythmias and, possibly, sudden death. If the gradient is > or = 80 mm Hg, intervention is clearly indicated; as techniques improve, delaying intervention in patients with gradients of 50-79 mm Hg may not be advantageous. Patients with gradients of 25-49 mm Hg can be followed medically with annual evaluation.