Abstract: Objective To evaluate the application of Doppler tissue imaging (DTI) in assessment of cardiac function after percutaneous coronary intervention (PCI) for myocardial infarction (MI) for long term follow-up. Methods 86 patients with MI were divided in PCI group (45 cases) and conventional therapy group (41 cases). All the patients received two-dimensional echocardiography (2DE) and DTI measurements. The left ventricular ejection fraction (LVEF), peak E, peak A wave velocities and peak E versus peak A (E/A) of 2DE were recorded, as well as the velocity of systolic wave(s), early diastolic filling wave(e), late filling wave(a) and wave e versus wave a (e/a ) of DTI. Results The LVEF and the average velocity of systolic wave (s) of mitral annulus was increased after PCI (P<0.05). S wave was related to LVEF, but the sensitivity of s wave is better than that of LVEF. There was no difference in the pulse Doppler trans mitral flow velocity E/A before and after PCI (P>0.05) , but the average velocity of mitral annulus (e/a ) was remarkably increased after PCI (P<0.01).Conclusion The left ventricular systolic and diastolic function in MI patients be improved after PCI. DTI is a sensitive method to detect the cardiac function after MI and PCI.

Key words: Doppler tissue imaging, echocardiography, myocardial infarction, cardiac function, percutaneous coronary intervention