[Surgical risk in preoperative general infections and/or immune deficiency]

The overall perioperative mortality did not change within the last 30 years. This disappointing reality is influenced by the preoperative physical condition of the increasing number of multimorbid patients. Especially the infectious problem is not to play down and is difficult to objectivize. Preoperative correction of even banal infections and malnutrition can prevent desolate complications. Operation and anesthesia per se raise the infectious danger.