INFLUENCE OF VAS-DEFERENS MOBILIZATION ON RAT FERTILITY - IMPLICATIONS REGARDING ORCHIOPEXY

Children who undergo bilateral orchiopexy often have oligospermia or a zoospermia in adulthood. This subfertility generally has been attribut ed to histological alterations in the cryptorchid testis. However, the possibility that an iatrogenic factor, such as mobilization of the va s deferens during orchiopexy, may have an adverse effect on fertility has not been studied. Six groups of mature Sprague-Dawley rats underwe nt right orchiectomy and the following procedures on the left side: gr oup 1-sham operation, group 2-2 cm. of vas mobilized, group 3-4 cm. of vas mobilized, group 4-2 cm. of vas mobilized and deferential artery stripped off of vas, group 5-4 cm. of vas mobilized and deferential ar tery stripped off of vas and group 6-vasectomy. Each rat was then hous ed with 2 female rats for 24 days. Mobilization of the vas with disrup tion of the mesentery resulted in slight but statistically insignifica nt reduction in fertility. However, when the deferential artery was di ssected off the vas, there was a marked reduction in fertility and fec undity. Histologically the vasa were normal without evidence of ischem ic necrosis. The testes in groups 2 to 5 showed variable depletion of germ cells with shedding of germinal epithelium, and the testes and ep ididymides in group 5 were similar to the changes seen in vasectomized rats (group 6). No testes were necrotic. These data suggest that exte nsive mobilization of the vas causes subfertility in this animal model and may be secondary to a functional obstruction resulting from vas d enervation. Whether a similar effect occurs during orchiopexy in human s deserves study.