Value of plane QRS-T angle on prediction of malignant ventricular arrhythmia occurred after emergency percutaneous coronary intervention in patients with acute myocardial infarction

Abstract

Objective To analyze the value of plane QRS-T angle on prediction of malignant ventricular arrhythmia (MVA) occurred after emergency percutaneous coronary intervention (PCI) in patients with acute ST-segment elevation myocardial infarction (STEMI). Methods The clinical data of 418 patients with STEMI who underwent PCI within 12 h of symptom onset were retrospectively analyzed, and the patients were divided into plane QRS-T angle ≤ 90° group (324 cases) and plane QRS-T angle >90° group (94 cases) according to the plane QRS-T angle after PCI. The clinical data were compared between 2 groups. Results Compared with patients in plane QRS-T angle ≤ 90° group, patients in plane QRS-T angle >90° group was older: (67.4 ± 11.8) years vs. (63.6 ± 12.0) years, QTc interval was longer: (438.60 ± 34.97) ms vs. (425.24 ± 25.49) ms, rate of left ventricular ejection fraction (LVEF) 90° was an independent risk factor of MVA after PCI in STEMI patients (OR = 9.640,P = 0.001), and using of beta-blockers was a protective factor (OR = 0.266,P = 0.028). Conclusions Plane QRS-T angle >90° is an independent risk factor of MVA after PCI in STEMI patients, while the use of beta-blockers is a protective factor. Paients with STEMI after PCI should be alert to the occurrence of MVA in the condition of plane QRS-T angle >90° and not taking beta-blockers. Key words: Myocardial infarction; Arrhythmias, cardiac; Angioplasty, balloon, coronary; Plane QRS-T angle