7d-6°卧床对心电向量图的影响

Effects of 7 d Head-down Bed Rest on Human Vectorcardiogram(VCG).

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 study the effects of short-term simulated weightlessness on human vectorcardiogram(VCG). Method Seven d -6° head-down bed rest (HDBR) was used to simulate weightlessness. Eight healthy males, aged 19～21, served as the subjects. VCG was recorded before and on day 1, 3, 7 of HDBR. Result QRS loop in the horizontal plane rotated counterclockwise, while QRS loop in the right sagittal plane rotated clockwise during HDBR(P<0.05 or P<0.01). QRS-T angle in the horizontal and right sagittal plane increased significantly during HDBR. Conclusion Seven d HDBR leads to changes of VCG parameters, which were all in normal ranges and in accordance with the volume changes of atrium and ventricle, but obviously different from those resulted from pathological ventricular thickening and myocardial ischemia.