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Funding Acknowledgements Type of funding sources: None. INTRODUCTION The right ventricular global longitudinal strain (RV GLS) increasingly has been used for the prognosis of mortality in the heart failure patients. However, the relationship of RV strains to other RV functional parameters and its dependency of functional tricuspid regurgitation (TR) as a result of left heart valvular disease is not well studied.  PURPOSE To investigate the relationship of RV geometry, functional and strain parameters to the predominant left heart aetiology in patients with functional TR as a result of left heart valvular disease.  METHODS Prospective observational cohort study enrolled patients with functional TR caused by left heart valvular disease for whom surgical valvular repairment is scheduled. Patients with ischemic heart disease (assessed by coronary angiography) were excluded from the analysis. The current study included 52 patients with full sets of preoperative echocardiographic parameters. Echocardiographic quantification included the following parameters: the RV geometry (RV diameters, RV area), functional (velocity of the tricuspid annular systolic motion (S’) and RV fractional area change (FAC)) and strain parameters (RV GLS, longitudinal RV free wall strain (RVFWS) and longitudinal strains of each segment of RV free wall). The severity of TR was measured quantitively according the recent ESC guidelines. Patients were divided into groups according to the predominant left heart valvular disease causing moderate or severe functional TR: 1. TR caused by primary severe mitral regurgitation (MR) due to mitral valve (MV) prolapse and MV chordae rupture; 2. TR caused by other left heart valvular pathologies (severe aortic stenosis [16 pts.], severe rheumatic aortic and MV disease [11 pts], severe aortic regurgitation [3 pts]). The statistical analyses were performed using SPSS statistical software.  RESULTS In 52 patients of current analysis 64% were female, mean age was 67 ± 9. The distribution of echocardiography parameters in study groups are shown in Table 1. The RV geometry parameters and parameter of TR severity (effective regurgitant orifice area (EROA) did not differ significantly between these two groups. The RV longitudinal function (S’) and RV strain parameters (RV GLS and longitudinal RVFWS) were better in severe MR group. CONCLUSIONS Although the right ventricular geometry and severity of functional tricuspid regurgitation does not depend on different predominant left heart valvular disease causing significant functional tricuspid regurgitation, the right ventricular longitudinal function and longitudinal right ventricular free wall strain are less affected and remains unimpaired in patients with functional tricuspid regurgitation caused by severe primary mitral regurgitation. Abstract Figure.

Right ventricular longitudinal strain remains unimpaired in severe primary mitral regurgitation and functional tricuspid regurgitation