Aim — to evaluate the results of tricuspid annuloplasty and conservative approach in patient with mild-to-moderate tricuspid regurgitation (TR) undergoing left-sided heart valve surgery. Material and methods. The study enrolled articles describing outcomes in patients who underwent left-sided heart valve surgery with or without tricuspid valve repair. Sources of information: MEDLINE, Embase, BioMedCentral, Google Scholar and Cochrane Central Register of Controlled Trials (1960—2017). We used RevMan 5.3 and Forest Plots construction. The heterogeneity was estimated by using of I2-value. Effect size was measured with Odds Ratio, Mantel-Haenszel value. Visual assessment of publication error risk was carried out with Funnel Plots. Results. 15 relevant articles were included. In all there were 2840 patients who underwent left-sided heart valve surgery with tricuspid valve repair (TVr) (n=1356) or without the last procedure (n=1484). Concomitant TVr for moderate TR during left-sided heart valve surgery was associated with significantly reduced cardiac mortality in long-term period (OR 0.38; CI 95% 0.25—0.58; p<0.001) without significant heterogeneity between studies (Q=5.2, heterogeneity = 0.73, I2 = 0%). TR ≥2 was significantly lower after TVr (OR 0.19, CI 95% 0.12—0.30; p<0.001) without significant heterogeneity between studies (Q=5.0, heterogeneity = 0.76, I2 =0%). Sensitivity analysis was conducted with the elimination of uncertainty by publication date. Conclusion. The main limitation of the trial is predominant non-randomized studies in overall sample (2 randomized and 13 non-randomized). Strong points of the article are systematic searching for studies, systematic error probability assessment by using of the tool (RoBANS, Cochrane Handbook for Systematic Reviews of interventions), independent examination of the metaanalysis protocol on the PROSPERRO resource. Registration on PROSPERRO: http://www.crd.york.ac.uk/PROSPERO. Registration number: CRD42017072357.