Given the values of the following pressures: • ? Pleural pressure 5 cm H2O • ? Alveolar pressure 5 cm H2O • ? Atmospheric pressure 1034 cm H2O Calculate the transpulmonary pressure gradient as air is leaving the lungs during expiration
A. 5 cm H2O
B. 0 cm H2O
C. 5 cm H2O
D. 10 cm H2O
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Transpulmonary pressure is defined as pleural pressure minus alveolar pressure that,
Ptranspulmonary = Ppleural Palveolar
= 5 cm H2O – 5 H2O
= 0 cm H2O
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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