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Clinical data and findings at necropsy are presented on a 2-year-old girl who had persistent complete common atrioventricular canal, hypoplastic left ventricle, and obstruction to the left ventricular outflow tract. Electro-cardiographic findings were atypical of common atrioventricular canal in that right axis deviation and a clockwise inscription of the QRS loop in the frontal plane were present. Findings in this case suggest that under-development of the left ventricle should be suspected when (1) displacement of the interventricular sulcus is noted on roentgenographic examinations and (2) predominant left-to-right shunting at ventricular level is found in the absence of electrocardiographic evidence of left ventricular overload.

circulation

Right Axis Deviation, Clockwise QRS Loop, and Signs of Left Ventricular Underdevelopment in a Child with Complete Type of Persistent Common Atrioventricular Canal