Right ventricular function is known to be depressed after cardiac surgery, but theextent and mechanism is not known. Aim of study was to assess the effect of coronary artery bypass grafting surgery on the right ventricle. RV function was studied pre and postoperatively in 20 patients scheduled for CABG(group 1) and in age and gender matched controls (group 2).Patients were followedup for 1 month after CABG. We prospectively evaluated right ventricular function byTissue Doppler imaging of the tricuspid annulus, and the basal septum, Tricuspidannular plane systolic excursion (TAPSE), and right ventricular dimensions .We alsomeasured left ventricular dimensions, left atrium and aortic root before and aftercoronary artery bypass grafting (CABG). Right ventricular function as evaluated by pulse wave Doppler tissue imaging intricuspid annulus it significantly reduced after CABG pre & post operative values(systolic velocity0.124 vs 0.091 m/s; p<0.014 , early diastolic 0.111 vs 0.079 m/s;p<0.001 , and late diastolic 0.160 vs 0.096 p<0.000 ).Likewise RV function asmeasured by tissue Doppler in basal septum was significantly reduced after CABG(systolic velocity 0.081 vs 0.071; p<0.046 , early diastolic 0.085 vs 0.070;p<0.017and late diastolic 0.099 vs 0.083 p<0.044 ). A significant reduction of the TAPSEoccured after CABG (2.386 vs 1.82; p <0.000).There was no significant difference inright ventricular dimensions. LVEDD significantly decreased after CABG (5.5 vs 5.2p<0.037).Comparison of the baseline data of group 1 patients with that of healthy controls(group 2) showed significantly lower LVESD in controls (3.79 vs 3.05 cm; p<0.001),LVEDD(5.5 vs 4.8 p<0.008), lower the LA (4.04 vs 3.6 cm; p<0.049), AOR (3.33 vs 3 cm p<0.024).When comparing right ventricular dimensions only the base to apexright ventricular dimension was significantly less in the patients group (4.98 vs 5.9cm p<0.001). Pulse wave Doppler tissue imaging showed lower systolic velocity ofthe basal septum (0.0819 vs 0.098 m/s p<0.031). The cardiothoracic surgery is not a benign event to the RV regarding the systolicfuncon, RV funcon remained depressed aer 1 month aer CABG. The CABGsurgery does not produce significantly gross remodeling of the RV.