Peroperative anesthesia-related critical events (CE) lead to adverse health outcomes in patients. To minimize recurrence of these outcomes, identifying problems causing CEs and obtaining information about their frequency and severity are important. This study aims to determine the frequency of anesthesia-related CEs occurring within intraoperative and postoperative 1 hour (h) in surgical patients at our tertiary care hospital, by system.

Inclusion Criteria:

• All patients

Exclusion Criteria:

• intubated outside the operating room
• taken into operation from the intensive care unit (ICU).

Age, gender, ASA (the American Society of Anesthesiologists) risk, surgical clinic, anesthesia method (general/regional/local/sedation/local+sedation), anesthesia and surgery duration of the patients, and anesthesia-related CEs occurring within intraoperative and postoperative 1 h were recorded.