The primary objectives of the study are

• to perform a survey on the clinical management of unintentional hypothermia during surgery in France.
• to assess the impact of perioperative hypothermia on anemia and myocardial injury.

100 investigation centers in metropolitan France will participate in the study, targeting 2000 included patients (20 surgical interventions in each center). The duration of inclusion in each center should last at most 2 weeks.

The selected surgical interventions will be those performed with a high frequency, practiced in all types of hospitals (public, private, university hospital or not), and requiring anesthesia of at leat 30 minutes (general, epidural or intrathecal anesthesia).

Inclusion criteria:

• Non-ambulatory surgery.
• Duration of anesthesia > 30 minutes.
• Type of surgery: urology, gynecological, gastrointestinal, vascular and orthopedics surgery.
• Type of anesthesia: general, intrathecal or epidural anesthesia.
• patient ≥ 45 years.
• No opposition of patient to participate in the study.

Exclusion criteria:

• Emergency surgery.
• Cardiac surgery, proctology surgery or thoracic surgery.
• Digestive endoscopy or surgical radiology.
• Septic surgery.
• Patient with at least one organ failure.

Patients undergoing surgical intervention, requiring 2 days of hospitalization