Does Sperm DNA Fragmentation Index Continuously Decrease Over Time After Varicocelectomy in Varicocele-Induced Infertility? A Systematic Review and Meta-Analysis.

Abstract

Varicocele (VC) is the most frequent and reversible cause of male infertility. One of the preferred management strategies to alleviate this problem is varicocelectomy. However, there are no researchers who have explored the relationship between better timing and postoperative sperm DNA fragmentation index (DFI) improvement in patients. We conducted this meta-analysis by enrolling published studies to find out the best waiting time after varicocelectomy to wait for better improvement of sperm DFI. A literature search was conducted using PubMed, Embase, Scopus, Web of Science, and Cochrane Library databases. The data from the pooled analysis were presented as mean difference (MD) along with a 95% confidence interval (CI). Heterogeneity was evaluated using I2. Four studies were included after screening relevant literature. Statistical analysis revealed that after varicocelectomy, follow-up results within 3 months showed a significant improvement in sperm DFI compared with the preoperative period (MD: -3.66, 95% CI = [-5.17, -2.14], p < .00001), and follow-up results with 6 months showed a significant improvement in sperm DFI compared with the postoperative 3 months as well (MD: -1.51, 95% CI = [-2.73, -0.29], p = .02). Notably, no further improvement in sperm DFI was observed when the follow-up period reached 12 months (MD: -1.59, 95% CI = [-3.22, 0.05], p = .06). Six months after varicocelectomy may be the optimal time for sperm DFI compared with 12 months or even longer, which means it is also the preferable time for conception. However, more well-designed prospective studies are needed in the future to validate our conclusion.