The clinical values of the early ST resolution after successful primary percutaneous coronary intervention in acute myocardial infarction patients

Objective To investigate the relationship between ST resolution and early prognosis of the patients with acute ST-elevation myocardial infarction (STEMI) receiving percutaneous coronary intervention (PCI).Methods A total of 80 consecutive patients with STEMI underwent primary PCI within 12 hours.ST segment elevation amplitude sum was measured and compared before PCI and 1 hour after PCI,and the percentage of declining was calculated.According to thrombolysis in myocardial infarction (TIMI) grading after PCI,the infarction related artery blood flow was recorded and compared.Ten of them who had experienced clear ST resolution (≥30％) before PCI were set aside.Among the other 70 patients,the ST resolution was calculated and the patients were divided into group A (41 cases,ΣSTE resolved ≥50％) and group B (29 cases,Σ STE resolved ＜ 50％).The left ventricular ejection fraction (LVEF),serious adverse cardiac events (MACE,including myocardial infarction,or revascularization,malignant arrhythmia,heart failure and death) in two groups during hospitalization was compared.Results The LVEF in postoperative 1 week in group A was higher than that in group B [(51.90 ± 5.06)％ vs.(46.87 ± 4.01)％,P ＜ 0.05].The incidence of in-hospital MACE during hospitalization in group A was lower than that in group B [7.3％ (3/41) vs.24.1％ (7/29)] (P ＜ 0.05).Conclusions Degree of ST resolution early after recanalization in acute STEMI patients receiving emergency PCI degree can better reflect the level of myocardial tissue perfusion and indirectly predict cardiac systolic function and in-hospital MACE.It can be used as evaluation index of early prognosis. Key words: Myocardial infarction;  Radiology,interventional;  Electrocardiography;  Prognosis