经皮冠状动脉腔内成形及支架术对冠心病患者QT离散度的影响

Effects of percutaneous transluminal coronary angioplasty and stenting on QT dispersion in patients with coronary heart disease

目的 :探讨经皮冠状动脉腔内成形及支架术 (PTCA +Stent)对冠心病患者QT间期离散度 (QTd)的影响。方法 :对 42例成功进行PTCA +Stent的冠心病患者 ,进行术前、后 12导联同步心电图QTd及校正后QTd(QTcd)测定。结果 :术后QTd及QTcd均明显减少 (P <0 .0 1) ,单支病变与多支病变术前QTd及QTcd无明显差别 (P >0 .0 5 ) ,术后单支病变QTd及QTcd的降低程度显著大于多支病变 (P <0 .0 1)。 9例伴室性心律失常者术后该症状消失。结论 :冠心病患者QTd及QTcd在PTCA +Stent术后随着心肌缺血及心室复极不均一性的改善而降低 ,其降低程度可能与侧支循环建立开放有关。

Objective The aim of this study was to approach the effects of percutaneous transluminal coronary angioplasty (PTCA) and stenting on QT dispersion (QTd) in patients with coronary heart disease. Methods PTCA and stenting were performed successfully on 42 patients with coronary heart disease. QTd and corrected QTd (QTcd) were obtained with a standard 12-lead ECG before and after PTCA+ Stent. Results QTd and QTcd after PTCA+Stent were reduced significantly compared to those before PTCA+Stent (P<0.01). There were no significant difference in QTd and QTcd before PTCA+Stent between single vessel lesion and multi-vessel lesion, but after PTCA+Stent, QTd and QTcd in single vessel lesion were decreased significantly compared to those in multi-vessel lesion. The ventricular arrhythmia in 9 patients was over after PTCA+Stent. Conclusions QTd and QTcd were decreased significantly after PTCA+Stent because of the improvement of myocardial ischemia and heterogeneous repolarization in patients with coronary heart disease. The degree in decreasing QTd and QTcd was associated with compensatory circulation in coronary artery.