What defect is necessary to survive with pulmonary atresia?a) Atrial sepal defectb) Aortic valve stenosisc) Undeveloped coronary sinusd) Left bundle branch blocke) Right bundle branch block
Question
What defect is necessary to survive with pulmonary atresia?a) Atrial sepal defectb) Aortic valve stenosisc) Undeveloped coronary sinusd) Left bundle branch blocke) Right bundle branch block
Solution
The defect necessary to survive with pulmonary atresia is a) Atrial septal defect.
Pulmonary atresia is a form of heart disease that occurs from birth (congenital heart disease), where the pulmonary valve does not form properly. The pulmonary valve is an opening on the right side of the heart that regulates blood flow from the right ventricle (right lower chamber of the heart) to the lungs. When pulmonary atresia happens, blood cannot flow from the right side of the heart to the lungs to pick up oxygen.
An atrial septal defect (ASD) is a hole in the wall (septum) between the two upper chambers of the heart (the atria). In the case of pulmonary atresia, an ASD or a patent foramen ovale (another type of hole in the heart) is necessary to allow oxygen-rich blood to mix with oxygen-poor blood. This mixing of blood allows the body to receive a sufficient amount of oxygenated blood. Without this defect, the condition would be fatal because there would be no way for blood to reach the lungs and then circulate to the rest of the body.
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