Factors influencing the outcome of in-vitro fertilization with percutaneous aspirated epididymal spermatozoa and intracytoplasmic sperm injection in azoospermic men.

In-vitro fertilization (IVF) by intracytoplasmic sperm injection (ICSI) with spermatozoa retrieved by percutaneous epididymal sperm aspiration (PESA) is a novel, simple and effective treatment for azoospermic men. In all, 38 azoospermic men had an IVF/PESA/ICSI cycle. A total of 42 cycles were performed. The aetiology of azoospermia was classified as failed vasectomy reversal (12 patients/16 cycles), inflammatory obstruction (five patients/five cycles), partial testicular failure (five patients/five cycles) and bilateral congenital absence of vas (16 patients/16 cycles). Adequate sperm preparations for ICSI were obtained from 38 of the 42 treatment cycles (90%). The mean fertilization rate was 32.7%, and fertilization occurred in 35 cycles (92.0%). Embryo transfer was performed in 13 out of 14 cycles (93%) in men with a failed vasectomy reversal, four out of five cycles in men with an inflammatory obstruction (80%), four out of four cycles in men with a partial testicular failure (100%), and 14 out of 15 cycles in men with a bilateral congenital absence of vas (93%). The overall pregnancy rate per two or three embryos transferred was 28.6 and 26.3% per treatment cycle respectively. The sperm parameters of the final pooled sperm aspirate preparations varied widely among the four aetiological groups. These parameters were of no value in predicting the fertilization or pregnancy rates (P > 0.05), and neither was the embryo cleavage rate.