Addition of clinical risk scores improves prediction performance of American Society of Anesthesiologists (ASA) physical status classification for postoperative mortality in older patients: a pilot study

Purpose Many methods for preoperative risk stratifications used in everyday practice do not take into account all of the comorbidities and complex physiological status of older patients. Therefore, anaesthesiologists and surgeons must consider multiple ways of preoperative diagnostics. Determining which of the preoperative clinical risk scores [Revised Lee score, the American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP) calculator and Surgical Outcome Risk Tool (SORT)] best improves routinely used American Society of Anaesthesiologists (ASA) physical status classification.