Effect of Goal-directed Fluid Therapy Using Stroke Volume Variation in Patients Undergoing Free Flap Reconstruction After Head and Neck Cancer Resection

Investigators hypothesized that goal-directed fluid therapy using stroke volume variation will improve postoperative recovery in patients undergoing free flap reconstruction after head and neck cancer resection. Investigators will compare the effect of goal-directed fluid therapy using stroke volume variation on recovery in patients undergoing free flap reconstruction after head and neck cancer resection.

Inclusion Criteria:

• adult patients of age over 20 years scheduled for free flap reconstruction after head and neck cancer resection

Exclusion Criteria:

• valvular heart disease
• congestive heart failure
• liver failure
• renal failure
• pregnant woman
• allergy to hydroxyethyl starch solutions
• coagulation abnormalities