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Retired NBME 15 Answers

nbme15/Block 4/Question#8 (reveal difficulty score)
A newborn delivered at 28 weeks' gestation is ...
Lung elastic recoil ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—cassdawg(1781)
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Premature infants have a lack of surfactant which decreases compliance of the lungs and increases the lung elastic recoil (FA2020 p665).

The high surface tension is the main contributor to elastic recoil in the lung of a neonate. Because the surface tension is high due to lack of surfactant, recoil is also high, and the lungs and alveoli have more tendancy to collapse.

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cassdawg  This has to do with the Law of Laplace and how this collapsing pressure is related to surface tension (FA2020 p661) +3
cheesetouch  FA18 p 643 +2
goljanoid  Would increased alveolar radius not be a complication of NRDS, due to lack of alveolar septation? +1



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