Tei index evaluates left ventricular function changes after on-pump and off-pump coronary artery bypass surgery

Objective： To compare function recovery of left ventricle after off-pump and on-pump coronary artery bypass （OPCAB and ONCAB） using Tel 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 Tel index were measured using transthoracic echocardiography before surgery and 3-7 days, 1 month, 3 months and 6 months after surgery. Results：Tel 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）. Tel 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, Tel 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. Tel 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.

Tei index evaluates left ventricular function changes after on-pump and off-pump coronary artery bypass surgery

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.