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In page Certified Registered Nurse Anesthetist:

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All challenges to the CRNA scope of practice occurred before 1940 and all were found in favor of the nursing profession, relying on the premise that the surgeon in charge of the operating room was the person practicing medicine. In the United States, nurse anesthetists practice under the state's nursing practice act (not medical practice acts), which outlines the scope of practice for anesthesia nursing.