Calculate the time constant for lung emptying given the information below. • ? Pplateau: 35 cm H2O • ? Raw: 1.2 cm H2O/L/sec • ? Cl: 50 ml/cm H2O
A. 0.06 second
B. 0.384 second
C. 1.75 seconds
D. 6.0 seconds
ANS: A
A. Correct response: The ventilation time constant is the product of the airway resistance and the lung compliance, that is, (50 ml/cm H2O = 0.05 L/cm H2O)
Raw × Cl = time constant
(1.2 /sec) (0.05 ) = 0.06 second
The time constant represents the time required for either lung filling or lung emptying.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.?
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