Study on the evaluation of different levels of QRS-T angle in patients with acute myocardial infarction

Abstract

Objective To investigate the evaluation of different levels of QRS-T angle in patients with acute myocardial infarction (AMI). Methods A total of 186 AMI patients from January 2010 to May 2016 in our hospital as the research object. The review method was used to analyze the clinical and follow-up data of the patients. The left ventricular ejection fraction (LVEF), plane QRS-T angle, white blood cell (WBC) and isoenzyme count and creatine (CK-MB) were evaluated and compared. Results ⑴ The age of the patients with heart failure was larger than that in the patients with normal heart function, and the proportion of myocardial infarction and hypertension and diabetes distributionthe in two groups had statistically significant difference (P<0.05); ⑵ The WBC and CK-MB levels of patients with normal cardiac function were lower than those in patients with heart failure. The planar QRS-T angle <50 degrees, between 90 degrees and 100 degrees and more than 100 degrees were statistically significant between normal heart function patients and failure heart function patients (P<0.05), and with the decrease of LVEF the levels of QRS-T angle increased; ⑶ The sensitivity and specificity of 90 degrees≤QRS-T angle<100 degrees and QRS-T angle greater than 100 degrees were 96.32% and 95.98%, 95.02% and 94.68%, and those were different with the sensitivity and specificity of WBC, CK-MB and other QRS-T angle(P<0.05). Conclusions Different planar QRS-T angle on the evaluation of cardiac function insufficiency has certain clinical value, but when the 90°≤QRS-T angle<100° and QRS-T angle≥100° have better sensitivity and specificity with no difference between two QRS-T angles. The QRS-T angle≥ 90° can be used as one of the indicators for the evaluation of cardiac function insufficiency. Key words: Myocardial infarction; Electrocardiography; Stroke volume; Leukocyte count; Creatine kinase