QT离散度自身重复性的再研究

目的观察QT离散度(QTd)的自身重复性,探讨应如何正确看待QTd自身重复性及临床应用问题。方法对每位受检者做QTd的反复测定,求出每位受检者4次QTd电脑测得值的平均值,用QTd(±s)ms表示,s按小样本标准差求得,其中s可反映同一受检者4次QTd的波动情况,其中s≤15ms视为重复性好,s>15ms为重复性差;同时认定=65ms为QTd的界值。根据同一受检者十二导联心电图同步描记QTd的几次电脑测得值的平均值及反映同一受检者QTd的波动的s值,结合受检者的临床情况做分组对比分析。结果通过分组对照,在QTd的临床应用中,部分受检者确有QTd自身重复性差的问题;但在根据临床病情分组研究中发现,QTd自身重复性问题不应成为QTd临床应用的障碍。结论如果我们将反映QTd自身重复性好与坏的s同QTd几次测得值的平均值进行综合分析,这样将会更好地发挥QTd的临床应用价值。

Objective Observation own repeatability of QT dispersion（QTd）,explore how to look at its own repeatability and clinical applications. Methods Each of the subjects to do repeated QTd determination,obtained the average value of 4 times QTd that computer measured about each the subjects,with QTd（x^-± s）ms said,s standard deviation accordance with smell samples obtained,s which can reflect the same subjects 4th QTd fluctuations,s≤15ms them as a good repeated,s〉15ms for the poor repeatabilitylAt the same time that x^-=65ms for the QTd threshold. According to the same subjects Twelve-lead ECG synchronization recording QTd simultaneous depiction of a few computer measured the average value of the x^- and reflect the same subjects QTd fluctuations in the value of the s, combination of subjects of clinical group to do comparative analysis of the situation.Results Through the control group,QTd in clinical applications,some of the subjects there are poor own repeatability of QTd：however,on the basis of clinical disease study group found that own repeatability issues of QTd should not be an obstacle to clinical application.Conclusion If we reflect QTd own good or bad repeatability of s with QTd measured several times the average value of a comprehensive analysis of X,this will give better play to the clinical value of QTd.