The delay phenomenon in types of deltopectoral flap studied by xenon-133

We have investigated the hemodynamic mechanisms of delay phenomenon of various types of deltopectoral flaps and optimal time for transfer after delay operation using the local clearance method of Xenon-133. Characteristic differences were observed in recovery patterns of the distal blood flow among five types of delay procedure the results obtained are reported. In Group 1 (U-shaped, raised deltopectoral flap), two types of recovery patterns (fast and slow) were obtained. In cases of faster recovery, the optimal transfer time after delay is considered to be almost 10 days. In cases of slow recover in groups I and II (U-shaped, raised deltoid flap), the optimal time for transfer is thought to be 2 to 3 weeks. In group III (deltopectoral flap lined with a split-skin graft) and group IV (tubed, raised deltopectoral flap), a faster recovery pattern was observed than in groups I and II, and the optimum transfer time is considered to be about 7 to 14 days after delay operation. Accordingly, the use of groups III and IV would be highly recommended instead of group I. In group V (bipedicled, raised deltopectoral flap), the time of lateral incision was found to be critical.