Left axis deviation on an electrocardiogram is generally an indication of cardiac abnormality.
Strengthens ECG-based detection of cardiac abnormality; supports consensus yet leaves open need for prospective validation.
It is now reasonably well established that the presence of left axis deviation in the electrocardiogram (mean QRS axis between -30and -90i n the frontal plane) is, with rare exceptions, an indication of cardiac abnormality (Grant, 1956; Curd, Hicks, and Gyorkey, 1961; Libanoff, 1964).
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Bahl et al. (1969) studied this question.
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