Human Reproduction, Vol. 14, No. 3, 741-748,
March 1999
© 1999 European Society of Human Reproduction and Embryology
Fertilization and pregnancy outcome with intracytoplasmic sperm injection for azoospermic men
1 The Center for Reproductive Medicine and Infertility and 2 The James Buchanan Brady Foundation, Department of Urology, The New York Hospital–Cornell Medical Center, and 3 The Population Council, New York, NY 10021, USA
The evident ability of the intracytoplasmic sperm injection (ICSI) procedure to achieve high fertilization and pregnancy rates regardless of semen characteristics has induced its application with spermatozoa surgically retrieved from azoospermic men. Here, ICSI outcome was analysed in 308 cases according to the cause of azoospermia; four additional cycles were with cases of necrozoospermia. All couples were genetically counselled and appropriately screened. Spermatozoa were retrieved by microsurgical epididymal aspiration or from testicular biopsies. Epididymal obstructions were considered congenital (n = 138) or acquired (n = 103), based on the aetiology. Testicular sperm cases were assessed according to the presence (n = 14) or absence (n = 53) of reproductive tract obstruction. The fertilization rate using fresh or cryopreserved epididymal spermatozoa was 72.4% of 911 eggs for acquired obstructions, and 73.1% of 1524 eggs for congenital cases; with clinical pregnancy rates of 48.5% (50/103) and 61.6% (85/138) respectively. Spermatozoa from testicular biopsies fertilized 57.0% of 533 eggs in non-obstructive cases compared to 80.5% of 118 eggs (P = 0.0001) in obstructive azoospermia. The clinical pregnancy rate was 49.1% (26/53) for non-obstructive cases and 57.1% (8/14) for testicular spermatozoa obtained in obstructive azoospermia, including three established with frozen–thawed testicular spermatozoa. In cases of obstructive azoospermia, fertilization and pregnancy rates with epididymal spermatozoa were higher than those achieved using spermatozoa obtained from the testes of men with non-obstructive azoospermia.
Key words: azoospermia/intracytoplasmic sperm injection/microsurgical epididymal sperm aspiration/testicular sperm extraction
4 To whom correspondence should be addressed at: HT-336, 505 East 70th Street, New York, NY 10021, USA
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