Given the following information, calculate the ventilation time constant. PIP 40 cm H2O; Pplateau 30 cm H2O; Raw 1.3 cm H2O/L/sec; CL 0.2 ml/cm H2O
A. 0.8 second
B. 0.26 second
C. 1.3 seconds
D. 3.9 seconds
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: The ventilation time constant is calculated by multiplying the airway resistance by the lung compliance. That is,
(Raw) × (CL) = ventilation time constant
(1.3 cm H2O/L/sec)(0.2 ml/cm H2O) = 0.26 second
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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