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Hoseini SS, Moeeny A, Shoar S, Shoar N, Naderan M, Gharibzadeh SH, Dehpour AR
Designing Nomogram for Determining the Heart's QRS Axis
Journal of Clinical and Basic Cardiology 2011; 14 (1-4): 12-15

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This Image - Fig. 1: QRS Complex
Figure/Graphic 1: QRS Complex
The drawing method for determination of the heart axis using the QRS complex. (a) Plot the net deflection of QRS complex (mean QRS) for both leads I and aVF along each lead; (b) Run perpendicular lines from each of the plotted points; (c) Z point represents the apex of the mean QRS axis; (d) Draw a vector between O point and Z point. The angle between lead I and OZ vector is the angle of the heartís electrical axis.
 
QRS Complex
Figure/Graphic 1: QRS Complex
The drawing method for determination of the heart axis using the QRS complex. (a) Plot the net deflection of QRS complex (mean QRS) for both leads I and aVF along each lead; (b) Run perpendicular lines from each of the plotted points; (c) Z point represents the apex of the mean QRS axis; (d) Draw a vector between O point and Z point. The angle between lead I and OZ vector is the angle of the heartís electrical axis.
 
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