axis deviation

axis deviation
alteration in the direction of the mean QRS complex vector, determined from the electrocardiogram; it may be due to alteration in the anatomical position of the heart or to any of a variety of disorders such as ventricular hypertrophy or bundle branch block. Relative to the hexaxial reference system (q.v.), a normal axis is −30° to 90°; right axis deviation is 90° to 180°; left axis deviation is −30° to −90°; and −90° to 180° is an indeterminate axis.

Medical dictionary. 2011.

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