A study of precordial leads in subjects with congenital dextrocardia and situs inversus viscerum

The chest leads of seven persons with congenital dextrocardia and situs inversus viscerum were studied. None of the seven showed any clinical evidence of heart disease. One subject, however, because she had systolic hypertension, was believed to be potentially abnormal, and was considered separately from the other six. The standard leads of this one subject were normal, but she had inverted T waves in CF_1–4 and diphasic T waves in CF₅ and CF₆. The data indicate that the chest leads of a person with congenital dextrocardia and situs inversus are approximately identical with those of an individual whose heart is on the left side, provided the technique of making the leads is altered to conform to the dextro-position of the heart.