What type of abnormality is the endocardial cushion defect type III?

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Multiple Choice

What type of abnormality is the endocardial cushion defect type III?

Explanation:
Endocardial cushion defects come from failure of the endocardial cushions to fuse and form the atrioventricular septum and valves. When the abnormality is Type III, it spans the AV canal, producing a complete AV septal defect with a common AV valve and communications between all chambers (an ostium primum ASD plus inlet VSD). This is what defines AV canal defects—there’s involvement of both atrial and ventricular septa and a shared AV valve—unlike an isolated ASD (atrial-only defect), a simple VSD (ventricular-only defect), or PDA (persistent ductus arteriosus).

Endocardial cushion defects come from failure of the endocardial cushions to fuse and form the atrioventricular septum and valves. When the abnormality is Type III, it spans the AV canal, producing a complete AV septal defect with a common AV valve and communications between all chambers (an ostium primum ASD plus inlet VSD). This is what defines AV canal defects—there’s involvement of both atrial and ventricular septa and a shared AV valve—unlike an isolated ASD (atrial-only defect), a simple VSD (ventricular-only defect), or PDA (persistent ductus arteriosus).

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