Ostium premium is also known by which term?

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Multiple Choice

Ostium premium is also known by which term?

Ostium primum is a defect located low in the atrial septum near the AV valves, and it arises when the endocardial cushions fail to fuse properly during heart development. Because of this embryologic origin, this defect is classically known as an endocardial cushion defect. This name reflects the involvement of the cushions that form the AV septum and the AV valves. It’s a specific type of atrial septal defect, different from ostium secundum defects (which occur at the fossa ovalis) and from ventricular septal defects or valvular issues like mitral valve prolapse.

Ostium primum is a defect located low in the atrial septum near the AV valves, and it arises when the endocardial cushions fail to fuse properly during heart development. Because of this embryologic origin, this defect is classically known as an endocardial cushion defect. This name reflects the involvement of the cushions that form the AV septum and the AV valves. It’s a specific type of atrial septal defect, different from ostium secundum defects (which occur at the fossa ovalis) and from ventricular septal defects or valvular issues like mitral valve prolapse.

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