Source: Robert O. Bonow, M.D., FACC. Cardiosource Expert Opinions. Posted August 30, 2006 http://www.cardiosource.com/302Bonow

Comment: A 2006 study of 132 asymptomatic patients with severe degenerative mitral regurgitation by echocardiography with LVEF>60%, LVESD <45mm, and PA systolic pressure <50 mmHg showed excellent outcomes with adherence to a guidelines-based treatment strategy. Rosenhek R, et al. Outcome of Watchful Waiting in Asymptomatic Severe Mitral Regurgitation. Circulation 2006; 113 (May 9): 2238-2244. Editorial on this subject.