Which of the following conditions does not cause right axis detion in ECG ?
Correct Answer: Lying down posture
Description: The electrical axis of the hea is the net direction in which the wave of depolarisation travels. It is measured using an electrocardiogram (ECG). Normally, this begins at the atrioventricular node (AV node); from here the wave of depolarisation travels down to the apex of the hea. The hexaxial reference system can be used to visualise the directions in which the depolarisation wave may travel. When subjects were lying on the left side during sleep, due to the effect of gravity on hea, the position of hea changed, for example, turned and rotated, causing changes in the ECG of frontal plane and horizontal plane, which lead to a change in ECG. Ref Harrison 20th edition pg 1449
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