Association between the length of the vas deferens excised during vasectomy and the risk of postvasectomy recanalization

Labrecque, Michel; Hoang, Diem-Quan; Turcot, Lucile

doi:10.1016/s0015-0282(02)04924-5

Cited by 19 publications

(5 citation statements)

References 14 publications

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“…In general, recanalization is extremely rare and may represent granuloma formation with multiple small proliferating epithelial lined channels containing spermatozoa [Haldar et al, ]. In one study of 870 vasectomized men, 50 (5.7%) had at least one post vasectomy semen analysis that showed motile sperm, which the authors considered evidence of recanalization [Labrecque et al, ]. It is important to note that while early (<6 month) or late (>6 month) recanalization is a considerable risk, the pregnancy rate after vasectomy is about 1 in 2,000 (0.05%) likely due to reduced number of sperm in the ejaculate [Philp et al, ].…”

Section: Discussionmentioning

confidence: 99%

Parthenogenesis in a Brazilian Rainbow Boa (Epicrates cenchria cenchria)

et al. 2012

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A 22-year-old captive Brazilian rainbow boa (Epicrates cenchria cenchria) gave birth to four offspring after being housed with a vasectomized male. Sexual reproduction as a result of failed prior vasectomy, recanalization of the vas deferens, or prolonged sperm storage was ruled out using the clinical history, histopathology, and gross necropsy. Short tandem repeat (STR) DNA markers were genotyped in the male, female, and four offspring. None of the offspring possessed a diagnostic STR allele present in the potential sire. In addition, all offspring were homozygous at each STR locus evaluated, supporting parthenogenetic reproduction. This is the first report of parthenogenesis in a Brazilian rainbow boa and has implications for the conservation of reptiles maintained in captive breeding programs.

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Section: Discussionmentioning

confidence: 99%

Parthenogenesis in a Brazilian Rainbow Boa (Epicrates cenchria cenchria)

et al. 2012

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“…A recent study found no association between the length of vas excised and the risk of recanalization [21] and success has been reported when no vas tissue is removed with occlusion by cautery combined with fascial interposition [5,22-24]. Clearly, additional study is needed before any evidence-based conclusions can be made about the importance of the type of cautery, use of fascial interposition, and excision of a segment of the vas in reducing the risk of vasectomy failure.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of vasectomy using cautery

et al. 2004

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BackgroundLittle evidence supports the use of any one vas occlusion method. Data from a number of studies now suggest that there are differences in effectiveness among different occlusion methods. The main objectives of this study were to estimate the effectiveness of vasectomy by cautery and to describe the trends in sperm counts after cautery vasectomy. Other objectives were to estimate time and number of ejaculations to success and to determine the predictive value of success at 12 weeks for final status at 24 weeks.MethodsA prospective, non-comparative observational study was conducted between November 2001 and June 2002 at 4 centers in Brazil, Canada, the UK, and the US. Four hundred men who chose vasectomy were enrolled and followed for 6 months. Sites used their usual cautery vasectomy technique. Earlier and more frequent than normal semen analyses (2, 5, 8, 12, 16, 20, and 24 weeks after vasectomy) were performed. Planned outcomes included effectiveness (early failure based on semen analysis), trends in sperm counts, time and number of ejaculations to success, predictive value of success at 12 weeks for the outcome at 24 weeks, and safety evaluation.ResultsA total of 364 (91%) participants completed follow-up. The overall failure rate based on semen analysis was 0.8% (95% confidence interval 0.2, 2.3). By 12 weeks 96.4% of participants showed azoospermia or severe oligozoospermia (< 100,000 sperm/mL). The predictive value of a single severely oligozoospermia sample at 12 weeks for vasectomy success at the end of the study was 99.7%. One serious unrelated adverse event and no pregnancies were reported.ConclusionCautery is a very effective method for occluding the vas. Failure based on semen analysis is rare. In settings where semen analysis is not practical, using 12 weeks as a guideline for when men can rely on their vasectomy should lessen the risk of failure compared to using a guideline of 20 ejaculations after vasectomy.

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“…ML has performed over 9000 vasectomies over the last 20 years, most using NSV combined with various occlusion techniques including cautery and FI. [1,15,24-26] Cautery handles and tips manufactured in USA (Advance Meditech International) and Canada (Walsh Medical Devices Inc.) were brought along in order to assess the feasibility of carrying out procedures under local conditions.…”

Section: Methodsmentioning

confidence: 99%

Vasectomy surgical techniques in South and South East Asia

et al. 2005

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Background: Simple ligation of the vas with suture material and excision of a small vas segment is believed to be the most common vasectomy occlusion technique performed in low-resource settings. Ligation and excision (LE) is associated with a risk of occlusion and contraceptive failure which can be reduced by performing fascial interposition (FI) along with LE. Combining FI with intra luminal thermal cautery could be even more effective. The objective of this study was to determine the surgical vasectomy techniques currently used in five Asian countries and to evaluate the facilitating and limiting factors to introduction and assessment of FI and thermal cautery in these countries.

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Association between the length of the vas deferens excised during vasectomy and the risk of postvasectomy recanalization

Cited by 19 publications

References 14 publications

Parthenogenesis in a Brazilian Rainbow Boa (Epicrates cenchria cenchria)

Parthenogenesis in a Brazilian Rainbow Boa (Epicrates cenchria cenchria)

Effectiveness of vasectomy using cautery

Vasectomy surgical techniques in South and South East Asia

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