Validation of Nicom Device to Measure Stoke Volume Variation

Validation of NICOM for the Detection of Modification of Stroke Volume

The purpose of this study is to evaluate the ability of NICOM (Noninvasive cardiac output monitor) to detect stroke volume variation induced by leg raising or fluid expansion during surgery

Inclusion Criteria:

• patients undergoing general anesthesia with an expected duration exceeding two hours
• gastrointestinal surgery, urological or gynecological surgery.

Exclusion Criteria:

• Difficulty of venous access.
• Contraindication for the use of oesophageal Doppler
• Contraindication for the use of Nicom
• Contraindication for the use of bispectral index
• Pregnant or lactating women