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NBME 16 Answers

nbme16/Block 2/Question#44 (reveal difficulty score)
Two days after undergoing a right hip ...
Dead space ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–

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submitted by โˆ—the_enigma28(69)

Large embolus obstructing pulmonary blood flow = Perfusion defect There is no capillary bed around smaller bronchi/bronchioles and they form the anatomical dead space. Since embolus also obstructs blood flow, the supplied alveoli which are ventilated, turn into dead space as no exchange of gases can occur through them.

โ†’ Shunt = Ventilation defect

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l0ud_minority  Shunt r/t a cardiac defect (eg VSD, ASD) or ARDS or pulmonary edema. +

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