Concept of surgical area. Preoperative nursing assessment. The operating room, the staff who work there and its behavior: uniforms and footwear, surgical scrub and sterile dressing. Check list in O.R.; management of electrical devices. The members of the surgical team. Management of sterilization processes and the material to be sterilized. Surgical instruments and sutures. Intraoperative nursing care; positions of the patient in the operating table according to the type of intervention. The nurse anesthesia and intraoperative monitoring. Assistance in the recovery room, monitoring of vital signs Management of postoperative pain and the routes of infusion with CVC and PVC. Drains and dressings. SNG, stoma and PEG.