Cerebral Flow-metabolism Coupling During Adult Surgery

Patient will receive propofol as their maintenance agent during surgery. The typical dose is 150-200 mg/kg/min.

Patient's anesthesia will be maintained with 1 MAC of sevoflurane during surgery.

The patient will receive ephedrine infusion as the primary vasopressor of choice. The typical dose of ephedrine infusion is 10-50 mg/hr (dilution 2 mg/ml).

Patient will receive phenylephrine infusion as the primary vasopressor of choice. The typical dose of phenylephrine infusion is 10-40 mcg/min (dilution 100 mcg/ml).