+Gz作用下心电图QT间期的改变及其意义

目的 探讨能否用ＱＴ间期来预测飞行员对＋Ｇｚ应激的反应情况。方法３７名空军 在人用离心机上经受峰值为４Ｇ的正向加速度作用，根据被试者对＋Ｇｚ应激反应的不同，将其分成Ａ组（反应良好组，ｎ＝１８）、Ｂ组（反应亢进组，ｎ＝１４）和Ｃ组（反应抑制组，ｎ＝１）。实验结束后测量＋Ｇｚ作用前、中、后心电图的ＱＴＵ是期和ＲＲＵ是期，并对能够测量出ＱＴ间期的３３人（８９．２％）的数据进行统计分析。结果 ＋Ｇｚ作用中

Changes in QT Interval of Electrocardiogram under +Gz Acceleration and Its Significance

Objective To define whether QT interval could be used to predict the response of pilots to Gz stress. Method 37 pilots underwent 4 Gz acceleration on a human centrifuge.According to their responses to Gz stress, subjects were divided into group A (good reaction group, n=18), group B (hyperfunction reaction group,n=14) and group C (inhibition reaction group,n=1). QT and RR interval were measured pre-,during and post G. The data of 33 subjects(89.2%) whose QT interval could be measured were analyzed statistically. Result During Gz, QT and RR interval were shortened and sensitivity of QT interval to RR interval was augmented significantly (vs. pre G, P< 0.001 );group B had higher sensitivity of QT interval to RR interval during Gz (P<0.001, as compared with group A);discrimination functions established by QT and RR interval during Gz were efficient and their accurate judgement rate was 81.8%. Conclusion The Changes in QT interval of ECG were related to autonomic nervous imbalance under Gz; QT interval and RR interval could be used to predict the response of pilots to Gz stress. These suggested that the parameters and method in this study might be used in G LOC warning system.