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An anesthesiologist is a doctor who gives a patient medication so they do not feel pain when they are undergoing surgery. However, these specialist physicians play a much wider role than just putting people to sleep for surgery. They are also involved in a range of other medical procedures, including carrying out assessments in critical care units, dealing with emergency situations, and giving advice about pain management. Anesthesiologists are involved in around 90 percent of the more than 40 million surgical procedures that are carried out under anesthetic each year in the United States. This involvement may include direct care of the patient or supervision of Certified Registered Nurse Anesthetists (CRNAs) or Anesthesia Assistants, who also play a key role in the field.