Two-dimensional analysis of hemodynamic changes in axial and random pattern flaps

The present study was performed to evaluate the time course of hemodynamic change in axial and random pattern flaps two-dimensionally. The axial pattern flap, including the central auricular artery and vein, and the random pattern flap without these vessels were created in the auricles of the rabbit. The blood flow of these flaps was investigated and assessed using laserflowgraphy, which provides a two-dimensional analysis of microcirculation. In the axial pattern flap, a gradient of blood flow toward the short axis of the flap and decreased blood flow in the surrounding area were noticed immediately after operation. The hemodynamic changes became less marked with time. In the random pattern flap, a gradient of blood flow toward the long axis of the flap was noticed around 6 hr after operation and the blood flow in the surrounding area increased throughout the investigations.