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  • Title: Vasectomy and vasovasostomy. II. A comparison of two methods of vasovasostomy: silastic versus chromic stents.
    Author: Urry RL, Thompson J, Cockett AT.
    Journal: Fertil Steril; 1976 Aug; 27(8):945-50. PubMed ID: 955137.
    Abstract:
    Twelve adult, bilaterally vasectomized dogs were used to compare two different procedures for reuniting the severed vas deferens. Approximately 5 months postvasectomy six dogs had vasovasostomies utilizing Silastic stents and the vasa deferentia of six additional dogs were rejoined with intravasal chromic stents. Ejaculates were subsequently obtained at 2-week intervals and evaluated for sperm count, motility, viability, and seminal ion concentrations. All of the dogs in which Silastic had been utilized as the stent had sperm reappear in the ejaculate, whereas only 40% of the dogs in which chromic catgut had been utilized had reappearance of spermatozoa. The over-all quality of the ejaculate was also better in the animals in which Silastic had been utilized. Testicular and epididymal histology was normal in most dogs of both groups, but three of the dogs with chromic stents in which the anastomosis had not been a success had abnormal histology, with reduced numbers of spermatocytes, spermatids, and spermatozoa. The data suggest that Silastic stents are better than chromic stents for vas reanastomosis. They also suggest that some dog testes react negatively to vasectomy and do not recover by 1 year postvasectomy when vas patency is not reversed. The use of Silastic and of chromic stenting materials for restoration of the patency of the severed canine vas deferens is compared. 12 adult male dogs were bilaterally vasectomized; 5 months later all has vasovasostomies. 6 animals had an intravas chromic stent and 6 had Silastic tubing rejoining the vas. Semen samples were evaluat ed for sperm count, motility, viability, andm orphology as well as for i on concentrations. Sperm reappeared in the ejaculate of all of the dogs in which Silastic had been utilized, but only 33% of the dogs with chromic stents had sperm appearing in the ejaculate. The overall quality of the semen was better in the dogs with Silastic stents; sperm motility, concentration, and viability was significantly higher than in the dogs with chromic stents. Most of the dogs had normal testicular and epididymal histology; 3 of the dogs with chromic stents with unsuccessful anastomosis had abnormal histology with reduced numbers of spermatocytes, spermatids, and spermatozoa.
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