Blinova E V, Sakhnova T A, Kozhemyakina E S, Vaida P, Capderou A, Atkov O Y, Trunov V G, Aidu E A I, Titomir L I
Cardiology Research Complex, Ministry of Health of Russian Federation, University Bordeaux 2, University Paris 11.
Bratisl Lek Listy. 2002;103(3):97-100.
The Decarto technique was used to study the orthogonal ECGs recorded in 23 subjects during parabolic flights (44 records). A parameter of the instantaneous decartograms, namely the activation area (AA), which is the total area of the depolarization front projection on the image sphere, was analyzed. We compared the values of AA during the periods of horizontal flight, upward parts of all parabolas, and the initial 10 s of microgravity of all parabolas. According to the characteristics of the vectorcardiograms and AA, all subjects were subdivided into 3 groups: with increased electric activity of the right ventricle (I), the left ventricle (II) and both ventricles (III). Changes of AA with change of gravitational levels in these groups showed some differences. In groups I and II, the AA of the initial part of the QRS complex increased during microgravity and decreased during hypergravity. In group III it decreased during microgravity and changed variously during hypergravity. The AA of the middle part of the QRS complex decreased during microgravity and increased during hypergravity, and these changes were more pronounced in group III. The changes of AA in groups I and II may be explained by the Brody effect. In group III, AA seems to be influenced by some additional factors, possibly by changes in the intramyocardial or intraventricular blood volume. The AA of the last part of the QRS complex increased during microgravity and decreased during hypergravity in all groups. This may be explained by an effect of mutual neutralization of depolarization fronts related to the changes of the QRS duration.(Fig. 3, Ref. 4)
采用德卡托技术对23名受试者在抛物线飞行期间记录的正交心电图（44份记录）进行研究。分析了瞬时心电向量图的一个参数，即激活面积（AA），它是去极化波前在图像球面上投影的总面积。我们比较了水平飞行期间、所有抛物线上升部分以及所有抛物线微重力初始10秒期间的AA值。根据心电图和AA的特征，将所有受试者分为3组：右心室电活动增强组（I组）、左心室电活动增强组（II组）和双心室电活动增强组（III组）。这些组中AA随重力水平变化的情况存在一些差异。在I组和II组中，QRS波群起始部分的AA在微重力期间增加，在超重期间减少。在III组中，它在微重力期间减少，在超重期间变化多样。QRS波群中间部分的AA在微重力期间减少，在超重期间增加，且这些变化在III组中更为明显。I组和II组中AA的变化可能由布罗迪效应解释。在III组中，AA似乎受到一些额外因素的影响，可能是心肌内或心室内血容量的变化。所有组中QRS波群最后部分的AA在微重力期间增加，在超重期间减少。这可能是由于与QRS波持续时间变化相关的去极化波前相互抵消效应所致。（图3，参考文献4）
