An Analysis of 35 Cases of the Complete Form of Persistent Common Atrioventricular Canal

Author:

TENCKHOFF LORE1,STAMM STANLEY J.1

Affiliation:

1. From the Departments of Cardiology and Pathology, Children's Orthopedic Hospital and Medical Center, and the Department of Radiology, University of Washington, Seattle, Washington.

Abstract

Thirty-five hearts with the complete form of persistent common atrioventricular canal were classified according to the morphology of the common anterior leaflet. The ratio of specimens with a free-floating undivided common anterior leaflet (Type I) to those with a divided common anterior leaflet attached to the septum (Type II) was 1:2. Type I cases had a high incidence of other cardiac (90 percent) and noncardiac (80 percent) malformations. These were primarily conotruncal anomalies (80 percent), left ventricular outflow obstructions (66 percent), aortic arch hypoplasia (30 percent), and abnormalities of organ position or symmetry including the polysplenia and asplenia syndromes. In contrast, Type II canals exhibited a high incidence of Down's syndrome (40 percent), other cardiac and noncardiac anomalies being less common. The associated anomalies suggest that Type I lesions reflect an earlier interference during embryogenesis than Type II lesions. A clockwise QRS loop and a normal or right axis on the electrocardiogram in four cases were associated with a left ventricular inflow tract of normal length, suggesting that conduction system displacement and a deficient base of the heart may be interrelated. Postmortem double contrast radiography confirmed the angiographic differences between Type I and II lesions, and in Type I lesions clarified the alterations in the angiographic profile occurring with variations in the fullness of the common anterior leaflet.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Physiology (medical),Cardiology and Cardiovascular Medicine

Reference27 articles.

1. Anatomic observations on complete form of persistent common atrioventricular canal;Mayo Clinic Proc,1966

2. Angiocardiography of persistent common atrioventricular canal;Mayo Clinic Proc,1967

3. Surgical repair of the complete form of persistent common atrioventricular canal;J Thorac Cardiov Surg,1968

4. Surgical repair of complete atrioventricular canal with anterior common leaflet undivided and unattached to ventricular septum;Mayo Clinic Proc,1969

5. A Method for Double-Contrast Stereoscopic Study of the Internal Anatomy of the Heart

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