心率对QT离散度的影响

Effect of heart Rate on QT dispersion.

目的 探讨心率对QT离散度 (QTd)的影响以及心率对QTd进行校正的必要性。方法 采用食道心房调搏法改变心率 ,同时记录每种心率的 12导联同步心电图以计算相应的QTd ,采用Bazett公式对QTd进行校正 (QTcd)。结果 QTd、QTcd均与心率呈负相关 (r分别为 - 0 5 44和 -0 6 6 4,P均小于 0 0 0 1) ;QTd与QTcd呈显著正相关 (r=0 98,P <0 0 0 1)。结论 QTd、QTcd与心率呈负相关 ,QTd与QTcd呈高度正相关 。

Objective This study was aimed to investigate the relation between heart rate(HR) and QT dispersion(QTd),and the necessity of QTd correction by heart rate.Methods HR was changed by transesophageal atrial pacing.The 12-lead synchrony electrocardiograms (ECGs) were recorded during transesophageal atrial pacing to calculate QT dispersion.QTd was corrected by Bazzet's formula.Results There was a negative correlation between QTd,QTcd and HR(r=-0.544 and -0.664,respectively,both p <0 001).There also exist significant correlation between QTd and QTcd (r=0.98, P <0 001).Conclusion There was a negative correlation between QTd?QTcd and HR.It isun necessary to correct QT dispersion by heart rate,at least with Bazett's methods,in clinical practice.