The original role of the anesthesiologist was to facilitate surgical procedures by providing analgesia and amnesia for patients in a safe manner. While this continues to be the primary responsibility of anesthesiologists, the breadth of anesthesia has now grown out of being practiced exclusively in the operating room to areas outside the OR as well as providing services as consulting specialty in many patient care areas. Anesthesiologists can now well be described as true perioperative physicians. Anesthesiologists provide care for invasive and noninvasive procedures outside the OR including MRI, CT, ECT, cardiac catheterizations, and interventional radiological procedures. In most institutions anesthesiologists are an integral part of the cardiopulmonary resuscitation, or “code team”, and are known to be the experts in patient resuscitation and life support.