View source for QRS axis

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|mainauthor= [[user:Vdbilt|I.A.C. van der Bilt, MD]]
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'''''Click and drag the arrow in the above animation to change the heart axis and see how the ECG changes.'''''
The electrical heart axis is an average of all depolarizations in the heart. The depolarization wave begins in the right atrium and proceeds to  the left and right ventricle. Because the left ventricle wall is thicker than the right wall, the arrow indicating the direction of the depolarization wave is directed to the left.

For a lot of people, this is a difficult concept. The theoretical part seems difficult, but in working with it, the reader will find it becoming clearer.