13 hearts with the above congenital disturbance are studied. The disturbance of the space orientation of the anterior and posterior interventricular septa is found. The aortal and pulmonary valves are found to be oriented at an angle to each other, and the route of the left coronary artery is changed. These features allow to suggest that the anomalous issue of the left coronary artery from the pulmonary artery originates from the alterations of the interaction between the arterial valves and peritruncal ring. The choice of surgery depends on the heart anatomy in each individual case.
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