A Certified Registered Nurse Anesthetist (CRNA) provides anesthesia care for a variety of surgical cases including general, gynecological, orthopedic, vascular, urological, and obstetric procedures. They work shifts of 8, 10, or 12 hours with on-call duties during weekdays and weekends, supporting anesthesiologists as needed. This role requires specialized training and certification to safely administer anesthesia and monitor patients throughout surgical procedures.