The purpose of this pilot study is to investigate whether two major vasopressors (norepinephrine vs. phenylephrine) used for treatment of hypotension during breast reconstruction with free flap transfer surgery have different effects on blood flow of the flap vessel measured by transit time flowmetry. Since there are few prior studies that compared the effects of these two vasopressors on the blood flow of the flap, this study will be conducted in the form of a pilot study in order to establish the evidence for the future randomized controlled trial.
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Graft mean blood flow measured using transit time flowmetry
Timeframe: Intraoperative period
Pulsatility of graft vessel measured using transit time flowmetry
Timeframe: Intraoperative period
Diastolic filling of the graft vessel measured using transit time flowmetry
Timeframe: Intraoperative period