1. From the Department of Anesthesiology (Y.L.), Department of Molecular Physiology and Biological Physics (G.K.O., D.N.D., B.R.D.), and Cardiovascular Research Center (K.H.D.), University of Virginia, Charlottesville, Va; Department of Pharmacology (C.P.R.), Merck Research Laboratories, West Point, Pa; Department of Cardiology (I.M.), University of Tokyo, Tokyo, Japan.