Introduction: Coronary artery bypass graft (CABG) surgery is a common therapeutic intervention performed in patients with coronary artery disease. However, this operation has several postoperative complications; One of the most common complications after CABG surgery is right ventricular dysfunction. Therefore, the aim of this study is to evaluate RV deformations indices after CABG surgery. Methods: This cross-sectional study was performed from 2019 to 2020 in the cardiac surgery ward of Farshchian Hospital in Hamadan. 40 patients with cardiac ischemia were studied as single vessel disease (SVD), two vessels disease (2VD) and three vessels disease (3VD) who were candidates for CABG surgery. All patients underwent color and tissue Doppler echocardiography and Strain RV imaging, before and one month after CABG. Data analysis was performed using SPSS version 21 and a p-value less than 0.05 was considered statistically significant. Results: Among 40 patients (32 males and 8 female), the average age was 65.17 (SD 7.87) and average body mass index was 25.59 (SD 3.20). 4 patients underwent off-pump CABG surgery. Mean LVEF, SPAP, and RV diameter one month after CABG significantly increased compared with pre-surgery and TDI (SM), Strain RV (GLS), FAC, MPI RV, and TAPSE were decreased, which was less in the group B (3VD) than the first group (P <0.001). There was no significant difference between RVDD and LVDD before and one month after CABG (P> 0.05). No significant correlation coefficient was observed between Strain RV changes and pump time. Conclusion: Changing the right ventricular geometry after CABG, leads to reduction of Longitudinal deformation while maintaining overall RV function. Therefore, it is recommended to consider lower normal values ​​for these indices after CABG to be taken.

Background: Coronary artery bypass grafting (CABG) is a surgical procedure used in the treatment of coronary artery disease and to improve heart function. Right ventricular (RV) function is unclear based on myocardial velocities before and after coronary artery bypass graft surgery. RV dysfunction is a known cause of hypotension in early CABG surgery. The diastolic function has been shown to be a significant contributor to mortality and cardiac morbidity in recent years. Our study aimed to assess RV diastolic dysfunction after CABG surgery. Methods: Forty-four patients with the two-vessel disease (2 VD), small vessel disease (SVD) and three-vessel disease (3 VD) facial ischemia candidates for CABG surgery were studied. All patients underwent colour Doppler and RV strain echocardiography before and one month after CABG surgery, and patients’ RV function indices were calculated. Data analysis was performed using SPSS 21 software and a value of P<0.05 was considered statistically significant. Results: Out of forty patients, the male to female ratio was 32:8 and their mean age was 65.17 ± 7.87 years and their mean body mass index was 25.59± 3.20. Four patients were operated on without pumps. One month after CABG, systolic pulmonary artery pressure (SPAP), left ventricular ejection fraction (LVEF) and RV Diameter indexes increased significantly. Fractional area change (FAC), RV global longitudinal strain (GLS), Tissue Doppler imaging systolic wave (SM), RV myocardial perfusion imaging (MPI) and Tricuspid annular plane systolic excursion (TAPSE) decreased, which was less in the 3VD group than in the 1VD/2VD group (P <0.001). There was no significant difference between RV diastolic diameter (RVDD) and left ventricular diastolic diameter (LVDD) before and one month after CABG (P <0.05). Additionally, no significant correlation was detected between changes in RV strain and pump connection time. Conclusion: RV diastolic function is significantly reduced after CABG surgery. Surgery without the pump can certainly not eliminate this dysfunction and be effective in reducing its severity.