目的探讨短期 - 6°头低位卧床模拟失重对人心电向量图 (vectorcardiogram ,VCG)的影响。 方法 8名健康男性志愿者 ,年龄 1 9～ 2 1岁 ,进行了 7d - 6°头低位卧床 (HDBR)试验。HDBR前、HDBR第 1、3和 7天时进行了 4次心电向量图检查。结果在卧床期间 ,横面QRS环呈逆钟向偏转 ;右侧面QRS环呈顺钟向偏转 (P <0 .0 5或P <0 .0 1 )。横面和右侧面QRS T夹角在卧床过程中显著增加 (P <0 .0 5或P<0 .0 1 )。其余指标变化不显著。结论 7d头低位卧床可使心电向量参数发生变化 ,这些变化与心房、心室的容积变化在时程上一致 ,而且这些参数的改变都在正常值范围内。它与心室病理性肥厚、心肌缺血时心电向量图各参数的变化显然不同。 Objective To investigate the effect of short-term 6 ° head-on-bed simulated weight loss on vectorcardiogram (VCG). Methods Eight healthy male volunteers, aged from 19 to 21 years old, underwent HDB for 7d - 6 °. HDBR before HDBR HDTR 1, 3 and 7 were 4 times ECG test. Results During the ambulatory period, the lateral QRS ring was deflected in a clockwise bell; the right lateral QRS ring was clockwise (P <0.05 or P <0.01). The QRS T angle between the lateral and right flanks was significantly increased during bed rest (P <0.05 or P <0.01). The remaining indicators did not change significantly. Conclusions 7d head-down ambulation can change the parameters of ECG, and these changes are consistent with the changes of atrial and ventricular volume in time course, and the changes of these parameters are within the normal range. It and ventricular pathological hypertrophy, myocardial ischemia when the vector diagram of the change is obviously different parameters.