Abstract
Summary The relation between the frontal QRS and age and body build was analyzed before and after a correction for heart position. Before correcting for heart position, a significant association was found between the frontal QRS axis and various measures of body build. The frontal QRS axis was also significantly related to age. The correction for heart position was based upon the frontal anatomic axis of the heart corrected for horizontal QRS axis deviation away from the frontal plane. After this correction for heart position, the association between the frontal QRS axis and age or body build essentially disappeared. Even when the analysis centered upon the effects of body build upon specific leads, no association was found after the correction for heart position. It was concluded that no significant variation in the frontal QRS axis was attributable to the independent effects of age or body build.
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