OBJECTIVE: To determine whether the injection of testicular spermatozoa results in more viable embryos (higher implantation rate) than injection of epididymal spermatozoa in cases of obstructive azoospermia. DESIGN: Retrospective analysis of 265 cases of testicular sperm aspiration (TESA) and percutaneous sperm aspiration (PESA), including 185 cases of obstructive azoospermia. SETTING: Private Infertility clinic. PATIENT(S): None, charts review. INTERVENTION(S): None, charts review. MAIN OUTCOME MEASURE(S): Clinical pregnancy rate (PR), implantation rate. RESULT(S): Although fertilization rates were higher in the PESA group, implantation rates were significantly better in the TESA group. There was also a trend to higher ongoing PR and lower miscarriage rates in TESA cases. CONCLUSION(S): In cases of obstructive azoospermia, embryos generated using testicular spermatozoa have higher developmental potential than those obtained using epididymal spermatozoa.
OBJECTIVE: To determine whether the injection of testicular spermatozoa results in more viable embryos (higher implantation rate) than injection of epididymal spermatozoa in cases of obstructive azoospermia. DESIGN: Retrospective analysis of 265 cases of testicular sperm aspiration (TESA) and percutaneous sperm aspiration (PESA), including 185 cases of obstructive azoospermia. SETTING: Private Infertility clinic. PATIENT(S): None, charts review. INTERVENTION(S): None, charts review. MAIN OUTCOME MEASURE(S): Clinical pregnancy rate (PR), implantation rate. RESULT(S): Although fertilization rates were higher in the PESA group, implantation rates were significantly better in the TESA group. There was also a trend to higher ongoing PR and lower miscarriage rates in TESA cases. CONCLUSION(S): In cases of obstructive azoospermia, embryos generated using testicular spermatozoa have higher developmental potential than those obtained using epididymal spermatozoa.