高原老年人QT离散度正常参考值的探讨

The QT dispersion normal value of the elderly in plateau

目的探讨高原老年人ＱＴ间期离散度（ＱＴｄ）正常参考值。方法选择海拔３０００～３３００ｍ高原居住的老年人１２０例，常规记录３导同步１２导联心电图，测定ＱＴ离散度（ＱＴｄ）、校正的ＱＴ离散度（ＱＴｃｄ）、ＪＴ离散度（ＪＴｄ）、校正的ＪＴ离散度（ＪＴｃｄ）４项参数，对不同年龄组、不同性别组与同海拔非老年组进行比较，判定其统计学意义。结果（１）高原老年人ＱＴｄ、ＪＴｄ均值分别为（４９±９）及（５１±１０）ｍｓ；（２）高原人进入老年阶段后ＱＴｄ各参数随增龄呈递增趋势，然其进程相对缓慢，仅６０～６４与８０～８４岁组间差异有极显著性（Ｐ＜０．０１）；（３）不同性别间差异无显著性。结论高原老年人ＱＴｄ、ＱＴｃｄ、ＪＴｄ、ＪＴｃｄ上限值分别为６４、６７、７０、７２ｍｓ，较同海拔非老年人显著延长。建议以≤上述各值作为高原老年人的正常参考值。

Objective To find the normal value of QT dispersion of old people in plateau. Methods One hundred and twenty cases of the elderly from altitude of 3 000 3 300 meters were chosen and their QT dispersion (QTd), corrected QT dispersion (QTcd), JT dispersion (JTd) and corrected JT dispersion (JTcd) were determined. Results The average value of QTcd and JTd of old people in plateau is (49±9) and (51±10) ms. All the parameters increased with aging, but the rise is rather slow. The difference between 60 64 and 80 84 age groups was marked ( P <0.01), and that between sexes was not marked. Conclusions Normal upper limit values of QTd, QTcd, JTd, JTcd of old people in plateau are 64, 67, 70, 72 ms. They are higher than those of younger people in the area of same altitude.