Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Segenreich, E. et al.

Evaluation of the relationship between semen parameters, pregnancy rate of wives of infertile men with varicocele, and gonadotropin-releasing hormone test before and after varicocelectomy.

ABSTRACT OBJECTIVES: To determine whether the gonadotropin-releasing hormone (GnRH) test can serve as an indicator for the need and timing of surgery in infertile men with varicocele. METHODS: The GnRH test was performed in 121 infertile men with varicocele before surgical correction and 4 to 6, 9 to 12, and 16 to 18 months after. Levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) were evaluated immediately before the test and 45 minutes after intravenous injection of 100 jig Relisorm L (a synthetic GnRH analogue). Eighteen fertile men with normal semen parameters served as control patients for defining the preoperative hormone levels. A more than twofold increase in FSH and a more than fivefold increase in LH was considered a positive result. Findings were correlated with semen parameters and rate of pregnancy in the patients' wives at 18 months postoperatively. RESULTS: Of the 121 patients, 89 (73.5%) had a positive GnRH test result, and 32 had a negative result. Semen parameters were improved postoperatively in 72 of the GnRH-positive patients (80.9%) and in only 6 of the GnRH-negative patients (1 8.7%). Corresponding pregnancy rates at 18 months in the two subgroups were 60 (67.4%) and 3 (9.3%), respectively. CONCLUSIONS: A positive preoperative GnRH test is a good predictor of improvement in semen parameters and pregnancy after varicocele surgery. We suggest that the GnRH test can serve as an additional indicator for varicocelectomy.[1]

References

Evaluation of the relationship between semen parameters, pregnancy rate of wives of infertile men with varicocele, and gonadotropin-releasing hormone test before and after varicocelectomy. Segenreich, E., Israilov, S., Shmuele, J., Niv, E., Baniel, J., Livne, P. Urology (1998) [Pubmed]

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