Key points are not available for this paper at this time.
Department of Anesthesiology, Hahnemann University Hospital, Broad and Vine Streets, Philadelphia, Pennsylvania. Address correspondence and reprint requests to Dr. Pietro Colonna-Romano, Department of Anesthesiology, Hahnemann University Hospital, Broad and Vine Streets, Philadelphia, PA 19102. The authors wish to thank Dr. Henry Rosenberg for valuable suggestions about the manuscript. Accepted for publication May 4, 1989.
Colonna-Romano et al. (Sun,) studied this question.