Abstract
In considering the problem of restenosis of the mitral valve, the author distinguishes between "true" restenosis which occurs after one or both commissures have been fully split, and "false" restenosis which occurs where neither commissure has been divided beyond the area of insertion of the papillary muscles. The literature is reviewed from this viewpoint and 8 cases of "false" restenosis and 4 cases of "true" restenosis which were reoperated are presented.. It is concluded that many patients who have a poor division of the commissures will almost certainly require a 2d operation; whereas those who have complete or almost complete division have only a small risk of restenosis.