Abstract: ［Abstract］ Objective〖HTSS〗To assess left atrial(LA) phasic function in patients with coronary heart disease(CHD).
〖HTH〗〖WTHZ〗Methods〖HTSS〗A total of 74 patients with CHD were assigned to case group,as compared with 45 volunteers were assigned to control group.Patients in case group were divided into three groups according to the degree of left ventricular diastolic function, including left ventricular diastolic function normal group,left ventricular diastolic function mild reduction group,left ventricular diastolic function moderate/severe reduction group. Speckle tracking imaging(STI) were applied to collect full volume image of the apex and to obtain entire longitudinal systole strain(Sa), strain in early diastolic (Se), and total strain(Stot=Sa+Se) for two groups of left atrial. We analyze variation of left atrial strain index and left atrial strain index variation of different levels in patients with CHD based on ventricle diastolic.
〖HTH〗〖WTHZ〗Results〖HTSS〗Compared with the control group, LA reservoir function and LA channel function were reduced significantly(Se： 12.46±2.69 vs 13.53±1.99; Stot： 23.04±4.53 vs 25.35±2.66). Differences in reservoir function and channel function were statistically significant in left ventricular diastolic function mild reduction group, LA phasic function in left ventricular diastolic function moderate/severe reduction group was decreased significantly(P＜0.05).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗 LA reservoir function and channel function were impaired in patients with CHD and deteriorated with the reduction of left ventricular diastolic function.LA contraction is preserved in normal and mild groups while impaired in moderate/severe groups．

Key words: coronary disease, atrial function, left, speckle tracking imaging