The authors investigated the optimal period of maturation following the creation of arteriovenous (AV) loops using polyterafluoroethylene (PTFE) in a white rat model, which were subsequently used to support free-tissue transfer The AV loops in Group 1 (n = 17) were allowed to mature for 3 days prior to creation of the flap, while those from Group 2 (n = 14) were allowed to mature for 5 days. Results were compared to those from a previous study in which the authors reported an 80 percent initial patency rate (n = 30) and a 67 percent viability rate, based on 12 patent loops after 7 days. In the present study, patency rates were 59 percent for the 3-day group and 79 percent for the 5-day group; viability rates were 50 and 64 percent, respectively. Considering both patent and nonpatent loops, the overall viability rates were 29 and 50 percent respectively. Maturation periods longer than 3 days for AV loops constructed from PTFE micrografts were determined to be preferable for subsequent free-tissue transfer.
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