Ostium primum atrial septal defect, also known as partial endocardial cushion defect or atrioventricular canal malformation, is caused by a developmental defect of the endocardial cushion during embryonic development. It forms a large semilunar atrial septal defect located anterior and inferior to the coronary sinus, with the inferior margin of the defect adjacent to the mitral annulus, often accompanied by a cleft mitral valve.
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This section is being translated and completed.
This section is being translated and completed.
This section is being translated and completed.
This section is being translated and completed.
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This information is for health education only and is not a diagnosis. Please consult a qualified clinician if you feel unwell.