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为探讨Q-T离散度(Q-T_d)变化的机制,观察39例老年人踏车运动试验前后心肌复极Q-T_d变化。结果显示:运动试验阴性组运动前Q-T_d、Q-T_(cd)及Q-T_d/R-R分别为38.6±9.9ms、43.6±12.1ms及4.95±1.55％,阳性组运动前为40.6±14.8ms、45.9±17.3ms及5.29±2.01％,两组均无显著性差异(P>0.05)。阴性组运动后上述3值为26.4±8.5ms,35.4±10.1ms及4.77±1.24％,其中Q-T_d及Q-T_(cd)显著缩短(P<0.001及0.05);阳性组为35.9±9.4ms、48.9±12.9ms及6.59±1.86％,其中Q-T_d/R-R显著延长(P<0.001),两组有显著性差异(P<0.01—0.001)。提示运动缩短健康老年人心肌复极离散度,但运动诱发的心肌缺血却使之延长。
To investigate the mechanism of Q-T dispersion (Q-Td), the change of Q-Td in myocardial repolarization was observed before and after treadmill exercise test in 39 elderly people. The results showed that the Q-Td, Q-T cd and Q-Td / RR before exercise were 38.6 ± 9.9ms, 43.6 ± 12.1ms and 4.95 ± 1.55% respectively in the negative group and 40.6 ± 14.8 in the positive group ms, 45.9 ± 17.3ms and 5.29 ± 2.01%, respectively. There was no significant difference between the two groups (P> 0.05). In the negative group, the above 3 values were 26.4 ± 8.5ms, 35.4 ± 10.1ms and 4.77 ± 1.24%, respectively. The Q-Td and Q-Td (cd) were significantly shortened (P <0.001 and 0.05) ms, 48.9 ± 12.9ms and 6.59 ± 1.86%, respectively. The Q-Td / RR was significantly prolonged (P <0.001). There was a significant difference between the two groups (P <0.01-0.001). Tip exercise to shorten the healthy elderly myocardial repolarization dispersion, but exercise-induced myocardial ischemia but to make it longer.