The summary done for perioperative risk factors should be jointly calculated by surgeons and anaesthetists. 2) Risk classification has to be accepted by both partners. 3) Preoperative screening has to be checked for relevance. 4) Known risk factors have to be eliminated by adequate pretreatment. 5) The operative procedure, anaesthesia and monitoring should be planned well ahead in risk patients. 6) Postoperative monitoring and postoperative treatment should be subject to joint discussions.
