ABSTRACT
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.
