LEFT VENTRICULAR PREPONDERANCE AND LEFT AXIS DEVIATION IN CYANOTIC CONGENITAL HEART DISEASE

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Abstract
Sixty-five patients with central cyanosis and electrocardiographic evidence of left axis deviation or left ventricular preponderance were studied. The most common causes of these combinations are tricuspid atresia, transposition of the great vessels, and single ventricle. Their order of frequency depends on whether left axis deviation, left ventricular preponderance, or both were used as criteria for assessment. Tricuspid atresia was found to account for only 40% of our patients having both left axis deviation and left ventricular preponderance in the cardiogram. The occurrence of cases of tricuspid atresia with an electrocardiographic pattern of right ventricular preponderance or right axis deviation is thought to diminish still further the accuracy of electrocardiographic diagnosis of this condition.