Conventional and simplified microsurgical isthmic tubal anastomosis compared in the rabbit.

Because the fallopian tube has potential for spontaneous recanalization, a simplified technique for isthmic anastomosis has been previously proposed. This study compares the simplified technique, which uses only one suture to approximate the tube, with a conventional isthmic anastomosis. The nidation index and patency rate subsequent to these procedures on the rabbit oviduct were evaluated. The conventional anastomosis gave a significantly better nidation index (P less than 0.01) and a patency rate (P less than 0.05). Even when tubal patency was established with the simplified technique, the nidation index may have been less than with conventional anastomosis (P less than 0.07). Gynecologic microsurgeons should continue to strive for the best anatomic repair possible when performing isthmic anastomosis and not rely on the fallopian tube's potential for spontaneous recanalization.