sentences:  Some sub-specialty physician anesthesiologists are an integral member of the critical care team in Surgical Intensive Care Units (SICU) and manage complex surgical patients throughout their hospitalization.Nurse anesthetists are advanced practice registered nurses specializing in the provision of anesthesia are Certified Registered Nurse Anesthetists (CRNAs).As of 2018, CRNAs represent 50% of the anesthesia workforce in the United States, with 52,000 providers, according to the American Association of Nurse Anesthetists, and administer approximately 36 million anesthetics each year.