The opinions expressed in this editorial are not necessarily those of the editors or of the American Heart Association.From Stanford University Medical Center, Palo Alto, Calif (G.W.A.), University of California, San Diego (J.A.Z.), and Washington University School of Medicine, St Louis, Mo (D.W.C.).Correspondence to Gregory W. Albers, MD, Stanford Stroke Center, 701 Welch Road, Suite 325, Palo Alto, CA 94304.(Stroke. 1998;29:1493-1494.).