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Circulation, Vol 60, 12-21, Copyright © 1979 by American Heart Association

ARTICLES

Left axis deviation: a reassessment

JK Perloff, NK Roberts and WR Cabeen Jr

This report deals with the ramifications of the concept of left axis deviation. In early life, the leftward shift of the frontal plane QRS axis is determined chiefly, if not solely, by the relative weights of the ventricles. Once adult ventricular weight ratios are reached, there is a long period of axis stability, then a gradual leftward drift of the QRS, governed principally by left anterior fascicular conduction. Thus, the normal QRS axis is age-dependent, and left axis deviation must be considered accordingly.

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