Evaluation Of The Alteration Of Left Ventricular Long-axis Function During Off-pump Coronary Artery Bypass Using Tissue Doppler Imaging

Objective Evaluation of left ventricular long-axis function during off-pump coronary artery bypass and to investigate its clinical significance by using Tissue Doppler imaging. Methods We studied 48 patients with coronary artery disease before and after 1 week and 3 months off-pump coronary artery bypass, and 35 healthy volunteers matched with age. From the apical four chamber view, the image of mitral inflow was obtained and early diastolic peak flow velocity (E), late diastolic peak flow velocity (A), the ratio of E/A and deceleration time of E wave (DT) were measured. The early diastolic peak myocardial motion velocity (Em), late diastolic peak myocardial motion velocity (A_M), the ratio of E_M / A_M, systolic peak myocardial motion velocity (S_M) and displacement (D_S) and electrocardiogram Q wave to onset of S_M (Q- S_M) were measured by tissue Doppler imaging. Results Compared with control group, the E of OPCAB group was decreased (P<0.01), E/A was decreased (P<0.05), A was increased (P<0.01). There was no difference in DT. E_M and E_M/A_M were decreased (P<0.01). There was no difference in A_M. S_M and D_S were decreased (P<0.01). Q-S_M was increased (P<0.05). There were no change in E, A, E/A and DT before and after OPCAB. E_M and E_M/A_M were increased after OPCAB (P<0.01). there was no change in A_M (P>0.05) .S_M and D_S were increased after OPCAB (P<0.01), Q-S_M was decreased after OPCAB (P<0.01). Conclusions Left ventricular long-axis function was improved after OPCAB. TDI can evaluate left ventricular long-axis function accurately before and after OPCAB.