Dramatic advances have been made in recent years in the field of cardiac surgery. Great ingenuity has been shown in the devising of surgical technics for the correction of congenital and acquired anomalies of the heart. One particularly ingenious technic devised by Murray1 for the surgical correction of mitral insufficiency has recently been modified by Bailey2 with considerable success.
In 1938 Murray obtained significant improvement in surgically induced mitral regurgitation in dogs, and later3 in man, by creating within the ventricle a new valve, of the sling or hammock type, which occluded the mitral orifice during ventricular systole and prevented the reflux of blood into the auricle. He constructed this valve by inserting a segment of peripheral vein reinforced with tendon entirely through the left ventricle, so that it formed a sling just below the mitral orifice. This graft was sutured to the outer surface of the