1. From the Cardiac Ultrasound Laboratory (H.B.T., B.K., M.S.-C.), Cardiology Division of the Department of Medicine, the Cardiovascular Research Center (H.B.T., B.K., M.J.R., K.D.B., M.S.-C.), the Anesthesia Center for Critical Care Research (M.J.R., K.D.B.), the Department of Anesthesia and Critical Care, the Pulmonary Critical Care Unit (R.S.S., A.W.), and Institute for Technology Assessment (E.F.H.), Massachusetts General Hospital, Boston, Mass; and Inserm E 0226 (G.D.), University Claude Bernard...