Effects of successful percutaneous transluminal coronary angioplasty or stent implantation in the recovery period after acute myocardial infarction on QT dispersion / 中国介入心脏病学杂志

ABSTRACT

Objective To evaluate the changes of QT dispersion (QTd) after successful percutaneous transluminal coronary angioplasty (PTCA) or stent implantation during the recovery period after acute myocardial infarction (AMI).Methods We studied 57 AMI patients who underwent PTCA or stent implantation and 86 normal coronary artery subjects used as control. Maximal and minimal QT interval (QT max and QT min) and QTd (QTd=QT max-QT min) were measured using 12-lead electrocardiography within 1 d before and 1 h after PTCA and stent implantation or coronary angiography.Results QTd and corrected QT dispersion (QTcd) were significantly prolonged in patients with AMI compared with control group. There was no significant difference in QTd and QTcd between anterior AMI and inferior one. QT max, QTc max, QTd and QTcd after PTCA or stent implantation were significantly decreased.Conclusion QTd and QTcd were significantly decreased after successful PTCA or stent implantation which were performed during the recovery period of AMI, which shows it can produce beneficial effects in decreasing the risk of ventricular arrhythmia and reducing mortality in AMI patients.