Abstract: This study investigated the value of two-dimensional speckle tracking (2D-STI) combined with dynamic electrocardiography in evaluating the prognosis of patients with acute myocardial infarction (AMI). AMI patients treated with percutaneous coronary intervention (PCI) were selected as the research subjects. All patients were followed up for 1 year after surgery. Among them, 47 patients with major adverse cardiovascular events (MACE) were selected as the MACE group, and the other 80 patients without patients with MACE served as a control group. The two groups of patients received dynamic ECG and 2D-STI examinations before operation, and the differences in the dynamic ECG and 2D-STI indexes of the two groups were analyzed, and the relationship between each index and MACE was analyzed by Logistic model. The dynamic electrocardiogram index standard deviation of NN interval (SDNN) and oscillation slope (TS) in the MACE group were lower than those in the control group, and the measured value of shock onset (TO) was greater than that in the control group (P<0.05). The values of left atrial maximum volume (LAVmax), left atrial minimum volume (LAVmin) and left atrial presystolic volume (LAVp) were higher than those of the control group. Left atrial active ejection fraction (LAAEF),Passive ejection fraction (LAPEF), left atrial systolic mean peak strain rate (mSRs), left atrial mean early diastolic strain rate (mSRe), left atrial late diastolic mean peak strain rate (mSRa), left atrial mean peak strain rate (mSs) measured value were lower than those of the control group (P<0.05). By observing the dynamic ECG parameters and 2D-STI parameters before PCI in AMI patients, early assessment of the risk of MACE after PCI can be carried out to a certain extent, which is beneficial to the early preventive treatment of patients.

Key words: two dimensional speckle tracking technology, dynamic ECG, acute myocardial infarction, prognosis, major adverse cardiovascular events