ABSTRACT
Vasospasm leading to thrombosis is a major cause of free flap failure. Flap blood flow may improve by application of vasodilating agents to the pedicle. The purpose of this study is to evaluate the effect of a novel S -nitrosylating agent, O -ethyl nitrite, on flap blood flow and pedicle vessels diameter in a rat model, after induction of vasospasm. Two hours after surgery, the arterial diameter was significantly (P < .05) dilated by treatment with O -ethyl nitrite, lidocaine, or lidocaine + O -ethyl nitrite. None of these treatments had a statistically significant effect on blood flow or venous diameter. Twenty-four hours following surgery, both O -ethyl nitrite- and lidocaine-treated groups had larger arteries than the control group (P < .05). The O -ethyl nitrite-treated animals also had significantly (P < .05) elevated blood flow compared with control animals, but lidocaine-treated animals did not demonstrate any improved flow at 24 hours. O -Ethyl nitrite may become clinically useful in microvascular surgery procedures.
KEYWORDS
Vasospasm - vasodilating agents - ethyl nitrite (ENO)
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Michael R ZennM.D.
Division of Plastic, Reconstructive, Maxillofacial, and Oral Surgery
Box 3358, Duke University Medical Center, Durham, NC 27710