1. From the Division of Cardiology (P.T., A.K., N.B., E.F., W.P., J.Z.), Division of Neuroradiology (K.O., N.K.), Department of Neurology (D.G.), Department of Neurological Surgery (M.T.L.), and Division of Physiological Nursing (B.D.), UCSF Medical Center, San Francisco, Calif.