Characteristics of non ST- segment- elevation acute myocardial infarction in patients

Objective To investigate the characteristics of Patients with Non- ST- Segment Elevation Acute Myocardial Infarction. Methods The data of 1024 inpatients with acute myocardial infarction who underwent coronary angiography( CAG) from June 2005 to June 2011 were retrospectively analyzed. All the patients were divided into two groups: patients with ST- segment elevation myocardial infarction( STEMI) who received emergency CAG within 24 hours,and patients who received CAG within 3 days after the onset of non- ST- segment elevation myocardial infarction( NSTEMI). The incidences of hypertension,diabete,and dyslipidemia in both groups were investigated.( IRA) were also calculated,and the levels of collateral circulation of IRA were evaluated in both groups. Results The higher incidences of hypertension( 57. 7% vs. 40. 3%,P 0. 05),diabetes( 31. 8% vs. 14.3%,P 0. 05),and dyslipidemia( 27. 2% vs. 12. 3%,P 0. 05) occurred in patients with NSTEMI,compared with STEMI. The patients with NSTEMI more commonly experienced angina pectoris and myocardial infarction ever. The rates of chronic total occlusive lesion and triple- vessel coronary disease were increased in patients with NSTEMI than STEMI( P 0. 05). The incidences of total occlusion of IRA in patients with NSTEMI and with STEMI were 55. 2%( 132 /239) vs. 82. 9%( 651 /785)( P 0. 001),and the incidences of collateral circulation for IRA were respectively 57. 5%( 137 /239) vs. 20. 5%( 161 /785)( P 0. 001). Conclusion The patients with NSTEMI more commonly have risk factor,such as hypertension,diabetes,and Dyslipidemia. The severe and extensive coronary arteries lesions were observed in the patients with NSTEMI. The lower incidences of total occlusion of IRA and higher levels of collateral circulation for IRA were observed in patients with NSTEMI than in STEMI,which may account for non ST-segment elevation but ST- depression.