1. Assistant Professor of Anesthesia, University of Pennsylvania. Recipient of National Institutes of Health Career Development Award 5-K3-GM-25,153–05.
2. Chief, Department of Clinical Physiology, Bispebjerg Hospital Much of the material in this article was presented by Dr. Lassen on October 27, 1969, when he served as Rovenstine Lecturer at the Annual Meeting of the American Society of Anesthesiologists in San Francisco, California.