1. From the UCLA Cardiac Arrhythmia Center (D.Y., R.W.C., P.S.R., O.A.A., K.N., E.L.S., K.S., M.V.), UCLA Neurocardiology Center of Excellence (D.Y., R.W.C., K.Y., P.S.R., O.A.A., K.N., E.L.S., A.M., K.S., M.V.), and Department of Cardiac Anesthesia (K.Y., A.M.), University of California, Los Angeles.