Atrial Septal Defects – Clinical Manifestations, Echo Assessment, …
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4373719/
Mar 23, 2015 · ASD types strictly include ostium secundum (~75% of cases), ostium primum (15–20%), and sinus venosus (5–10%), while rare coronary sinus defects are closely related. 1 Secundum ASDs are positioned by the fossa ovalis, primum ASDs inferiorly as part of the spectrum of endocardial cushion defects, and sinus venosus ASDs near the superior or inferi...
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