Electrocardiograms were analysed and the QRS axes were determined in I79 patients with proven congenital ventricular septal defect. The average QRS axis was + s8oand there was no significant difference between male andfemale patients in the average size of the defects or the average QRS axis degree. Obvious or extreme left axis deviation was found in Io I per cent and
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H Backman (1972) studied this question.
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