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Pedicle musculocutaneous flap transplantation: prediction of final outcome by transcutaneous oxygen measurements in hyperbaric oxygen

, : Pedicle musculocutaneous flap transplantation: prediction of final outcome by transcutaneous oxygen measurements in hyperbaric oxygen. Plastic and Reconstructive Surgery 91(2): 329-334

In pedicle musculocutaneous flaps, a local circulatory insufficiency with a total or subtotal ischemia may occur and jeopardize the result of the reconstructive surgery. Transcutaneous oxygen pressure (PtcO2) monitoring has been shown to reflect tissue perfusion and has been advocated to predict the final outcome of ischemic flaps. Unfortunately, under normal atmospheric conditions, this test is not sufficiently discriminative. We evaluate the effect of hyperbaric oxygen conditions on the efficiency of this test. Fifteen patients with pedicle musculocutaneous flap were evaluated by clinical examination and transcutaneous oxygen tension measurements. The final outcome was healing in 7 and failure in 8. In order to determine the predictive value of transcutaneous oxygen tension, measurements were done immediately after the surgical procedure. In ambient air, neither the absolute value of transcutaneous oxygen tension (2.6 +/- 3.6 versus 11.7 +/- 12.6 torr; N.S.) nor the difference or the ratio between the transcutaneous oxygen tension of the flap and the subclavicular reference shows any significant difference according to the outcome (failure or success). The same is true in normobaric oxygen. In hyperbaric oxygen, however, there is a significant difference in transcutaneous oxygen tension between the two groups (12 +/- 12 versus 378 +/- 385 torr; p < 0.01). A transcutaneous oxygen tension higher than 50 torr in hyperbaric oxygen (2.5 atm abs) is the best cutoff value to discriminate success from failure.


PMID: 8430149

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