Primum Atrial Septal Defect

 

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  • Example 1

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A primum ASD is the simplest form of an AV canal defect due to failure of the fusion of superior and inferior endocardial cushions. Frequently they can occur with cleft mitral valves. The give away for an AV canal defect is shown here: the mitral and tricuspid valves are at the same plane (normally the tricuspid valve is more apical).

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Color Doppler shows that the shunt is predominantly left to right. Note the RV is quite dilated in this individual.
Measurement of the defect by TTE shows that it is 1.3 in diameter