<正>Objective: To compare function recovery of left ventricle after off-pump and on-pump coronary artery bypass （OPCAB and ONCAB） using Tei index. Methods: Twenty-four patients with coronary artery disease were enrolled

twelve of which received OPCAB and the others underwent ONCAB. Left ventricular ejection fraction （LVEF）

E/A ratio at mitral orifice and Tei index were measured using transthoracic echocardiography before surgery and 3-7 days

1 month

3 months and 6 months after surgery. Results:Tei index of both groups decreased 3-7 days after surgery

with OPCAB group’s lower than ONCAB group’s. The difference between pre-and post-OPCAB was significant （P<0. 01 ）

but not for ONCAB group （P>0. 05）. Tei index of ONCAB decreased more significant than that of OPCAB 1 month after surgery

there was statistical difference between 3-7 days and 1 month after surgery in ONCAB （P<0. 01）. Afterwards

Tei index of the 2 groups decreased steadily with no significant difference between them at other time points. LVEF and E/A ratio decreased at first

then increased gradually

with no statistical differences between the 2 groups at all time points. Conclusion: The recovery of left ventricular function after OPCAB is earlier than ONCAB. Tei index is more sensitive than LVEF and E/A ratio in detecting cardiac function recoveries and can be considered as an accurate and simple method to evaluate left ventricular systolic and diastolic function.