The Effect of Thrombolytic, Anticoagulant, and Vasodilator Agents on the Survival of Random Pattern Skin Flap.

Background: The aim of this study was to investigate the effect of subcutaneously applied thrombolytic, anticoagulant, and vasodilator agents on the survival of random-pattern skin flap.

Methods: A caudally based dorsal flap model was used in 24 rats in four groups. In group 1 (n = 6), flap was elevated and sutured. In group 2 (n = 6), enoxaparin sodium was injected subcutaneously immediately after surgery, on days 1 and 2. In group 3 (n = 6), a transdermal nitroglycerin was applied directly following surgery, on days 1 and 2. In group 4 (n = 6), alteplase was injected subcutaneously immediately after surgery, on days 1 and 2. Blood flow was measured with laser Doppler flowmetry at the proximal and distal halves of flap before, immediately after surgery, and on days 3 and 7. Histologic samples were taken from the same locations on day 3 and day 7 postoperatively. Vessel and lymphocyte count was obtained. Photographs were taken to determine flap necrosis areas at day 7 postoperatively.

Results: Area of skin necrosis was found to be less in all medication groups. But only enoxaparin sodium group showed significant decrease in skin necrosis (p < 0.05). Laser Doppler flowmetry showed a gradual decrease in all groups over time, with no statistically significant result. The histologic findings revealed the induction of angiogenesis in all experimental groups.

Conclusion: Subcutaneously applied thrombolytic, anticoagulant, and vasodilator agents increase random-pattern skin flap survival with only enoxaparin sodium showing significant decrease in flap necrosis.