Abstract

Introduction: The assessment of electrical heart axis (EHA) has important applications towards interpretation of electrocardiogram (ECG) of patients in both clinical and epidemiological studies. Objective: The present study was conducted to assess the EHA from net voltages of QRS complexes in bipolar and augmented unipolar leads. Methods: The calculation of EHA in the frontal plane were determined using different formulae: , , , and using hexaxial reference system. Results: Comparable results were obtained with , , and for the prediction of normal EHA and Left Axis Deviation (LAD) with formula methods showing highest similarity with the hexaxial system. However, none of the formula was suitable for the prediction of Right Axis Deviation (RAD) and Extreme Axis Deviation (EAD).The EHA obtained from the leads after applying correction did not differ significantly from the values without correction The EHA values calculated using four formula methods different non-significantly except the and formula in the prediction of normal EHA. Conclusion: For all practical purposes, and formulae may be used for rapid EHA computation of normal heart axis and LAD. These two formulae may be tested for designing nomogram of normal EHA and LAD with large number of cases. Newer formula needs to be developed for the rapid calculation of RAD and EAD.A single formula for the pr

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