Ideal culture time for improvement in sperm motility from testicular sperm aspirates of men with azoospermia.

PURPOSE

The motility of testicular derived spermatozoa reflects viability and predicts success during intracytoplasmic sperm injection. Although improvements in sperm motility are seen after incubation for extended periods, no guidelines suggest duration or media use for optimal improvement in motility.

MATERIALS AND METHODS

Between July 1999 and February 2005 testicular aspirations were performed on 95 men with azoospermia, including 51 with obstructive azoospermia and 44 with nonobstructive azoospermia. Sperm motility was determined at initial collection and following incubation for 24 or 48 hours in processing media or Ham's F10 + protein. A mixed regression model controlling for testis side, media and baseline motility was created to analyze the change in motility between 24 and 48 hours.

RESULTS

Mean motility improved from 3% to 20% at 24 hours and 25% at 48 hours for OA cases and from 0% to 5% at 24 hours and 11% at 48 hours for nonobstructive azoospermia cases. The improvement in motility from 24 to 48 hours was significant for obstructive azoospermia cases (p = 0.001). While media was a nonsignificant factor in regression models, when patients were grouped into categories of motility change there was a significantly better response to F10 compared to processing media (p = 0.03).

CONCLUSIONS

Incubation in processing media or Ham's F10 + albumin media improves sperm motility with significant improvement noted between 24 and 48 hours for obstructive azoospermia cases. Ham's F10 + albumin media may provide extra benefit for cases of nonobstructive azoospermia or nerve injury. These results suggest the ideal timing of oocyte retrieval for intracytoplasmic sperm injection correlates with 48-hour sperm incubation for obstructive azoospermia cases, and 24 hours for nonobstructive azoospermia and nerve injury cases.