食管心房调搏心脏负荷试验QT离散度对冠心病的诊断价值

目的: 研究QT离散度(QTd)在食管心房调搏心脏负荷试验时是否随着心肌缺血的诱发而增大。方法: 分冠心病组和正常对照组,分别观察两组负荷试验前、负荷试验中最高心率时、负荷试验后即刻和2 min的QTd。结果: 冠心病组调搏最高心率时、调搏后即刻及2 min的QTd较调搏前显著增大(P<0.01),而对照组较调搏前无明显增大(P>0.05)。结论: 食管心房调搏心脏负荷试验中QTd增加可以作为诊断冠心病心肌缺血的有效指标。

Diagnostic value of QT dispersion for coronary artery disease in transesopagus atrial pacing heart stress test

Objective:To study whether the value of QT interval dispersion(QTd) increases along with precipitation of myocardial ischemia in transesophagus atrial pacing heart stress test.Methods:The QTd was measured in patients with coronary artery disease and normal subjects before stress test,during stress test,when the pacing heart rate achieved the maximum,the moment and two minutes after stress test.Results:QTd of the maximal pacing heart rate during stress test,the moment and two minutes after stress test increased significantly( P <0.01) compared with those before stress test in patients with cornary artery disease.QTd of the maximal pacing heart rate during stress test,the moment and two minutes after stress test did not increase significantly( P >0.05 ) compared with those before stress test in normal subjects.Conclusions:It suggests that increase of QTd might be used as an index to judge coronary artery disease in transesophagus atrial pacing heart stress test.