RESUMO
Erythrocyte lysing buffer (ELB) facilitates the search for spermatozoa by eliminating erythrocytes in testicular suspension used during the ICSI procedure. This study investigates the effects of ELB on sperm quality parameters, sperm chromatin and sperm DNA fragmentation. Normal ejaculations were used as the model for testicular spermatozoa in this study. After swim-up, the sperm pellets were divided into two parts. Part I, the control (Group A), was diluted with culture media; and Part II, the intervention group (Group B), was diluted with ELB for 10 min. After centrifugation in both groups, the sperm pellets were re-suspended with culture media. The samples were immediately evaluated (A0 and B0) and then evaluated again after 1 hr (A1 and B1). The results indicated ELB decreased the progressive motility (81.60 ± 8.69 vs. 64.69 ± 19.08) and viability (97.62 ± 3.02 vs. 85.91 ± 11.46), in Group A and B, respectively, both immediately and 1 hr after preparation. Also, ELB engendered a significant increase in the DNA fragmentation index both immediately (9.68 ± 3.55 vs. 14.38 ± 6.52) and after 1 hr (10.37 ± 5.03 vs. 19.38 ± 6.39). In conclusion, ELB may damage sperm cells, shown by a decreased motility and viability, and it increased DNA fragmentation. Therefore, the use of ELB in testicular semen handling should be discouraged.