Impact of Varicocele Repair on Semen Parameters in Infertile Men: A Systematic Review and Meta-Analysis.

Despite the significant role of varicocele in the pathogenesis of male infertility, the impact of varicocele repair (VR) on conventional semen parameters remains controversial. Only a few systematic reviews and meta-analyses (SRMAs) have evaluated the impact of VR on sperm concentration, total motility, and progressive motility, mostly using a before-after analytic approach. No SRMA to date has evaluated the change in conventional semen parameters after VR compared to untreated controls. This study aimed to evaluate the effect of VR on conventional semen parameters in infertile patients with clinical varicocele compared to untreated controls.

A literature search was performed using Scopus, PubMed, Embase, and Cochrane databases following the Population Intervention Comparison Outcome (PICOS) model (Population: infertile patients with clinical varicocele; Intervention: VR [any technique]; Comparison: infertile patients with clinical varicocele that were untreated; Outcome: sperm concentration, sperm total count, progressive sperm motility, total sperm motility, sperm morphology, and semen volume; Study type: randomized controlled trials and observational studies).

A total of 1,632 abstracts were initially assessed for eligibility. Sixteen studies were finally included with a total of 2,420 infertile men with clinical varicocele (1,424 patients treated with VR vs. 996 untreated controls). The analysis showed significantly improved post-operative semen parameters in patients compared to controls with regards to sperm concentration (standardized mean difference [SMD] 1.739; 95% CI 1.129 to 2.349; p<0.001; I²=97.6%), total sperm count (SMD 1.894; 95% CI 0.566 to 3.222; p<0.05; I²=97.8%), progressive sperm motility (SMD 3.301; 95% CI 2.164 to 4.437; p<0.01; I²=98.5%), total sperm motility (SMD 0.887; 95% CI 0.036 to 1.738; p=0.04; I²=97.3%) and normal sperm morphology (SMD 1.673; 95% CI 0.876 to 2.470; p<0.05; I²=98.5%). All the outcomes showed a high inter-study heterogeneity, but the sensitivity analysis showed that no study was sensitive enough to change these results. Publication bias was present only in the analysis of the sperm concentration and progressive motility. No significant difference was found for the semen volume (SMD 0.313; 95% CI -0.242 to 0.868; I²=89.7%).

This study provides a high level of evidence in favor of a positive effect of VR to improve conventional semen parameters in infertile men with clinical varicocele. To the best of our knowledge, this is the first SRMA to compare changes in conventional semen parameters after VR with changes in parameters of a control group over the same period. This is in contrast to other SRMAs which have compared semen parameters before and after VR, without reference to a control group. Our findings strengthen the available evidence and have a potential to upgrade professional societies' practice recommendations favoring VR to improve conventional semen parameters in infertile men.

The world journal of men's health. 2022 Oct 28 [Epub ahead of print]

Ashok Agarwal, Rossella Cannarella, Ramadan Saleh, Florence Boitrelle, Murat Gül, Tuncay Toprak, Gianmaria Salvio, Mohamed Arafa, Giorgio I Russo, Ahmed M Harraz, Rajender Singh, Nicolas Garrido, Taha Abo-Almagd Abdel-Meguid Hamoda, Amarnath Rambhatla, Parviz Kavoussi, Shinnosuke Kuroda, Gökhan Çalik, Pallavi Saini, Erman Ceyhan, Fotios Dimitriadis, Ralf Henkel, Andrea Crafa, Ayad Palani, Mesut Berkan Duran, Evangelos Maziotis, Émine Saïs, Marion Bendayan, Mahsa Darbandi, Tan V Le, Sezgin Gunes, Petroula Tsioulou, Pallav Sengupta, Berk Hazir, Gökhan Çeker, Sara Darbandi, Damayanthi Durairajanayagam, Azin Aghamajidi, Noora Alkhalidi, Emrullah Sogutdelen, Kristian Leisegang, Abdullah Alarbid, Christopher C K Ho, Vineet Malhotra, Federica Finocchi, Luís Crisóstomo, Raghavender Kosgi, Haitham ElBardisi, Armand Zini, Ponco Birowo, Giovanni Colpi, Hyun Jun Park, Ege Can Serefoglu, Quang Nguyen, Edmund Ko, Jean de la Rosette, Germar M Pinggera, Ho Vinh Phuoc Nguyen, Hussein Kandil, Rupin Shah

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