The inspiratory time setting for an infant with bronchopulmonary dysplasia (BPD), airway re-sistance of 45 cm H2O/L/sec, and lung compliance of 0.004 L/cm H2O should be which of the following?
a. 0.25 second
b. 0.45 second
c. 0.6 second
d. 0.9 second
ANS: D
Raw ? CL = 1 time constant. This is 0.18 sec in this problem. One time constant multiplied by 5, or 0.90 second, should be the inspiratory time setting for this patient.
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