Human Reproduction, Vol. 16, No. 1, 138-144,
January 2001
© 2001 European Society of Human Reproduction and Embryology
Clinical importance of zona pellucida-induced acrosome reaction and its predictive value for IVF
1 Andrology Laboratory, Drs du Buisson and partners, Pretoria and 2 Department of Obstetrics and Gynaecology, University of Stellenbosch, Tygerberg, South Africa
The study aimed to establish zona pellucida induced acrosome reaction response (ZIAR) among 35 couples with normal and G-pattern sperm morphology and repeated poor fertilization results during assisted reproduction treatment. ZIAR tests were performed using 0.25 zona pellucida/µl co-incubated with spermatozoa for 60 min. Acrosome reactions were measured with FITC–PSA staining, and expressed as the difference between stimulated and unstimulated (spontaneous) sperm populations. Results were compared with IVF rates of metaphase II oocytes. Interactive dot diagrams divided the patients into two groups, i.e. ZIAR <15% and ZIAR > 15%, with mean fertilization rates of 49 and 79% respectively. The sensitivity and specificity for ZIAR results versus fertilization were 93 and 100% respectively. The area under the curve was 99% and the 95% confidence interval did not include 0.5 which implies that the ZIAR test is able to predict fertilization failure among IVF patients. In conclusion, the ZIAR test has diagnostic potential since it can assist the clinician to identify couples that will benefit from intracytoplasmic sperm injection therapy.
Key words: acrosome reaction/failed fertilization/zona pellucida
3 To whom correspondence should be addressed at: Department of Obstetrics and Gynaecology, 3rd Floor, Tygerberg Hospital, Tygerberg, 7505, South Africa. E-mail: dfranken{at}gerga.sun.ac.za
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