UNIPOLAR ELECTROCARDIOGRAPHY IN PULMONARY STENOSIS

Abstract

Congenital pulmonary stenosis with intact ventricular septum is a relatively common mal- formation of the heart. The stenosis varies from almost complete obliteration to a minimal decrease in the diameter of the orifice. The stenosis is usually of the valve, but it may be either of the infundi- bulum or of the lower bulbar orifice. The atrial septum may be complete, imperfectly developed, or it may be fenestrated: there is often anatomical patency of the foramen ovale, which may or may not allow the passage of blood from the right to the left atrium during life. The pulmonary artery beyond the stenosis is usually dilated and thin-walled, but it may be normal.