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S ANESTHESIOLOGY has matured, it has played a progressively more prominent role in care of the sick. Modern improvements have enhanced materially the safety of the patient. Morbidity and mortality rates have fallen. Furthermore, operating conditions have been improved and the scope of the surgeons extended. Surgeons have been enabled to undertake more prolonged, more difficult, and more dangerous procedures. Therefore, these highly skilled operators first beseeched, then demanded, thedoi:10.1213/00000539-194901000-00059 fatcat:zrecplpkqfaudhs6wybbvczegi