*Assistant Professor, Wake Forest University Department of Anesthesiology, Section on Obstetric Anesthesia and Fulbright Scholar. †Resident, Uludaǧ University Department of Anesthesiology and Reanimation. ‡Professor, Uludaǧ University Department of Anesthesiology and Reanimation. §Associate Professor, Uludaǧ University Department of Anesthesiology and Reanimation. ∥Instructor, Uludaǧ University Department of Anesthesiology and Reanimation.Received from the Department of Anesthesiology, Section on Obstetric Anesthesia, Wake Forest University School of Medicine, Winston-Salem, North Carolina, and the Department of Anesthesiology and Reanimation, Uludaǧ University, Bursa, Turkey. Submitted for publication March 25, 1999. Accepted for publication August 25, 1999. Support was provided by a Fulbright Scholarship to Dr. Owen, Senior Lecturer, Council for International Exchange for Scholars, US Department of Education, Washington, DC.