Human Reproduction, Vol. 14, No. 10, 2651-2655,
October 1999
© 1999 European Society of Human Reproduction and Embryology
Cumulative delivery rates after intracytoplasmic sperm injection: 5 year follow-up of 498 patients
Centre for Reproductive Medicine, Dutch-speaking Brussels Free University, Laarbeeklaan 101, B 1090 Brussels, Belgium
The use of life-table analysis for infertility data has the advantages of clarity and ease of application. Success rates per cycle have been reported, but not cumulative delivery rates for intracytoplasmic sperm injection (ICSI). We selected retrospectively 498 Belgian patients <37 years old, who had their first ICSI cycle between July 1992 and December 1993. Follow-up was till the end of October 1997. Outcome measure was any delivery >25 weeks. These couples underwent 963 ICSI cycles using fresh ejaculated spermatozoa. The indications for ICSI were long-standing severe male infertility or fertilization failure after conventional in-vitro fertilization (IVF). Cumulative delivery rates were calculated by life-table analysis and compared according to age groups and sperm quality. There were 298 deliveries within a mean rate per cycle of 31%. The average number of cycles required for a delivery was 3.15 (CI 2.88; 3.43). Twenty-three (4.6%) spontaneous pregnancies occurred after the patients had finished therapy. There was no significant difference between the sperm quality groups but delivery rates decreased significantly with increasing female age. The real delivery rate after six cycles was 60%, while the expected cumulative delivery rate was 86%. This life-table analysis may provide a means by which to counsel couples on the likelihood of a delivery following ICSI.
Key words: cumulative delivery rates/ICSI/pregnancy/spermatozoa
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