Reddy L P, Thombre D P, Kela A K, Rai U C
Indian J Physiol Pharmacol. 1984 Jan-Mar;28(1):27-34.
The effect of altered fore limb alignment to trunk on mean electrical axis (MEA) and on amplitude of the QRS complex of frontal plane leads was studied in both prone and supine postures in 32 albino rats. It was found that in both postures bilateral extension of fore limbs caused a significant change in MEA to right. Unilateral change in the fore limb alignment caused a shift in MEA to right only in supine position, but was ineffective in prone position. The amplitudes of QRS complexes also changed with change in MEA. The changes in MEA with change in limb alignment and subsequent alteration in amplitude of QRS complexes can be attributed to the alteration in anatomical orientation of the heart in the chest cavity.
在32只白化大鼠中，研究了前肢与躯干对线改变对平均电轴（MEA）和额面导联QRS波群振幅的影响，姿势分别为俯卧位和仰卧位。结果发现，在两种姿势下，前肢双侧伸展均导致MEA显著右移。前肢对线的单侧改变仅在仰卧位时导致MEA右移，而在俯卧位时无效。QRS波群的振幅也随MEA的改变而变化。MEA随肢体对线改变以及随后QRS波群振幅的改变可归因于胸腔内心脏解剖方向的改变。
