EKG Dictionary
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Axis & chamber enlargement

Normal axis

Also callednormal QRS axis · normal cardiac axis · normal electrical axis

Definition

A mean frontal-plane QRS axis lying between -30 degrees and +90 degrees. On the quick lead-based method the QRS complex is net positive (upright) in both lead I and lead II, which excludes both left and right axis deviation.

Sources

  1. Surawicz B, Childers R, Deal BJ, Gettes LS. AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances. Circulation. 2009;119(10):e235-e240. doi.org/10.1161/CIRCULATIONAHA.108.191095
  2. Gao Q, Dai Z, Hu Y, et al. A new method to determine the QRS axis: QRS axis determination. Clin Cardiol. 2020;43(12):1534-1538. doi.org/10.1002/clc.23477
  3. Meek S, Morris F. ABC of clinical electrocardiography. Introduction. I: Leads, rate, rhythm, and cardiac axis. BMJ. 2002;324(7334):415-418. doi.org/10.1136/bmj.324.7334.415

Last reviewed 2 October 2026. Every definition in the EKG Dictionary cites the guideline, consensus statement or original paper it comes from.

More in Axis & chamber enlargement

Cardiac axis Cornell criteria Extreme axis deviation Hexaxial reference system Left atrial enlargement (LAE) Left axis deviation (LAD) Left ventricular hypertrophy (LVH) P mitrale P pulmonale Right atrial enlargement (RAE) Right axis deviation (RAD) Right ventricular hypertrophy (RVH) Sokolow-Lyon criteria

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