The primary objective of this study is to demonstrate that preoperative fasting does not increase the rate of lowered blood volume (defined by a variation of 15% ΔITV during a leg lift) in patients undergoing surgery.

Inclusion Criteria:

• The patient must have given his/her informed and signed consent
• The patient must be insured or beneficiary of a health insurance plan
• The patient is ASA (American Society of Anesthesiologists) class I, II or III
• The patient has not been fasting for more than 6 hours at the time of inclusion
• The patient is schelduled for a gynecological or visceral surgery

Exclusion Criteria:

• The patient is participating in another study
• The patient is in an exclusion period determined by a previous study
• The patient is under judicial protection, under tutorship or curatorship
• The patient refuses to sign the consent
• It is impossible to correctly inform the patient
• The patient is pregnant
• The patient is breastfeeding
• The patient is ASA class IV
• The patient has insulin dependent diabetes
• The patient has a cardiac or respiratory dysfunction
• The patient has a heart rhythm disorder
• The patient has renal insufficiency with dialysis
• The patient is being treated with diuretics
• The patient has had a bowel preparation
• Emergency surgery
• Outpatient surgery

Patients recruited during anesthesia consultations carried out before programmed gynecological or visceral surgeries.