The effects of lipo-prostaglandin E1 on axial pattern flaps in rabbits.

The effects of lipo-prostaglandin E1 (lipo-PGE1), lipid microspheres containing PGE1, on axial pattern flaps were examined using 12 x 20 cm axial pattern flaps based on the right superficial inferior epigastric vessels on the abdomens of rabbits. The surviving area of the skin flap in the lipo-PGE1 group (0.197 +/- 14.1 cm2; n = 10) was significantly increased (p < 0.02) compared with the saline control group (110.4 +/- 5.5 cm2; n = 10). Changes in pedicle blood flow after lipo-PGE1 administration were determined using an ultrasonic pulsed Doppler flowmeter (n = 5). Blood flow in the artery was increased immediately after administration, and it was maintained for 40 minutes. The surface blood flow at the caudal end of the flap on the nonpedicle side, where it was poor, was measured using laserflowgraphy. Blood flow in the skin flap surface was improved 5 to 15 minutes after lipo-PGE1 administration, and it was maintained for as long as 60 minutes. Venous occlusion of the skin flap was also improved (n = 3). In conclusion, lipo-PGE1 increased the blood flow in the axial pattern flaps, resulting in significant enlargement of the surviving skin flap area.