The authors are in the Departments of Pharmacology and Anesthesiology, Medical College of South Carolina, Charleston, South Carolina. Dr. Bagwell is Advanced Research Fellow of the South Carolina Heart Association. Dr. Woods, recipient of a Research Career Development Award from the National Institutes of Health. This work was supported by grants from the National Heart Institute (HTS-5200, HE-00040–16 and HE-05348–03) and the South Carolina Heart Association.