The Vectorcardiogram and Electrocardiogram in Persistent Common Atrioventricular Canal

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Abstract
The electrocardiogram and vectorcardiogram are of great aid in differentiating atrial septal defect of the secundum type from the ostium-primum type. In the latter condition there is left axis deviation in the scalar electrocardiogram and superior orientation of the QRS vector in the sagittal and frontal planes. There are relatively few congenital lesions that lead to the same degree of axis deviation and superior orientation of the QRS vector.