Atrioventricular Canal Defect (AVC)
(AV canal, endocardial cushion defect) is present at birth and includes:
- An atrial septal defect (ASD) low in the atrium (called a primum ASD)
- A ventricular septal defect (VSD) high in the ventricle
- A common atrioventricular valve (instead of two separate valves, the mitral and tricuspid valves)
Atrioventricular canal defect occurs when the center of the heart does not form properly. The condition varies in severity. Some infants will only have mild symtoms while others may have difficulty growing and gaining weight. The symptoms are commonly those of congestive heart failure. Most children undergo surgery between 3-6 months to patch the septal defects and repair the atrioventricular valve.
Normal heart – in a healthy heart with proper blood flow, the blue droplets representing oxygen-poor blood travel to the lungs, and the red oxygen-rich droplets circulate through the body.
A heart with atrioventricular canal defect (AVC).