Shear stress is most likely to affect a patient with which of the following?
a. PA = 35 cm H2O; Ppl = 21 cm H2O
b. PA = 35 cm H2O; Ppl = 12 cm H2O
c. PA = 45 cm H2O; Ppl = 33 cm H2O
d. PA = 50 cm H2O; Ppl = 38 cm H2O
ANS: B
The amount of shear stress across the entire lung can be estimated using the transpulmonary pressure (Pplateau − Ppl), where Pplateau represents PA and Ppl is the intrapleural pressure.
Health Professions
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