9 Questions
What is the most common type of atrial septal defect (ASD)?
Ostium secundum defects
What leads to the closure of the ductus arteriosus postnatally?
Release of Bradykinin
What is the main cause of ostium secundum defects in the atrial septum?
Excessive resorption of septum primum
During the development of the atrial septum, which structure allows blood to bypass the foetal lungs?
Ductus arteriosus
What is the shape of the septum primum during the development of the atrial septum?
Sickle shaped
What happens to the right atrium during the development of the atrial septum?
Enlarges in size
What is the consequence of a failure to close the ostium primum above the AV valves?
Left-to-right shunting of blood
What marks the closure of the atrial septum post-natally?
Lungs inflate
Which defect is associated with exercise intolerance in older children and adults?
Ostium primum defect
Learn about the development of the heart in embryos, including the pre- and post-natal circulation, fetal circulation, atrial septum formation, and the development of key structures like the right atrium and venous valves.
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