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To elucidate the effect of tricuspid annuloplasty concomitant with left-sided valve surgery on the right heart in patients with mild or more tricuspid regurgitation (TR).We enrolled 78 patients with mild or more TR who underwent left-sided valve surgery. Forty-three patients underwent only left-sided valve surgery (group non-T) and 35 underwent concomitant tricuspid annuloplasty (group T). Echocardiographic changes between the preoperative and 1-year follow-up periods were compared. Propensity score matching was used to obtain risk-adjusted outcome comparisons (16 pairs).In group non-T, there were more operations for aortic stenosis and concomitant coronary artery bypass grafting, and fewer operations for mitral regurgitation. The prevalence of atrial fibrillation was higher in group T. In preoperative echocardiography, there were no significant differences in left ventricular and right ventricular (RV) dimensions and functions. Tricuspid valve annular diameter and TR-related parameters were significantly larger in group T. Left ventricular dimensions and TR-related parameters significantly improved in both groups 1 year after operation. RV diameter was significantly reduced in only group T. In analysis of variance, RV diameter in systole and diastole showed significant interaction, whereas left heart dimensions and function, tricuspid valve tethering height, and RV fractional area change did not show interaction. These results were not attenuated even after propensity-matching analyses.Among patients with mild or more TR, RV reverse remodeling was not obtained with left-sided valve surgery alone. Additional use of tricuspid annuloplasty might potentially achieve favorable TR regulation as well as RV reverse remodeling.