Vectorcardiogram in Persistent Common Atrioventricular Canal

Abstract

The analyses and description of the preoperative and postoperative vectorcardiogram (Frank lead system) in 28 patients with persistent common atrioventricular canal were presented.
(1) QRS loop in the frontal plane showed characteristic pattern, but not in the horizontal plane.
(2) In the group associated with pulmonary stenosis, the maximum vector was situated in the right superior quadrant in the frontal plane, and in the right posterior quadrant in the horizontal plane.
(3) In the same group, almost all T loop in the horizontal plane was inscribed in a counterclockwise fashion.
(4) Left axis deviation may be brought about by not only anomalous conduction pathway but also left ventricular overload.