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关键词：高海拔；心电扫记术；心肌缺血
【摘要】 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3000～3 300 m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。
The QT dispersion normal value of theelderly in plateau
LI Donghui, LI Weilin, TIAN Zhong-xin, et al.The 4th Hospital of PLA, Qinghai Xining 810014
【Abstract】 Objective To find thenormal value of QT dispersion of old people in plateau. Methods Onehundred and twenty cases of the elderly from altitude of 3 000-3 300 meters were chosenand their QT dispersion (QTd), corrected QT dispersion (QTcd), JT dispersion (JTd) andcorrected JT dispersion (JTcd) were determined. Results The averagevalue of QTcd and JTd of old people in plateau is (49±9) and (51±10) ms. All theparameters increased with aging, but the rise is rather slow. The difference between 60-64and 80-84 age groups was marked (P<0.01), and that between sexes was not marked. Conclusions Normalupper 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.
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