The inspiratory time setting for an infant with RDS, airway ...

[kaid0807]

The inspiratory time setting for an infant with RDS, airway resistance of 30 cm H2O/L/sec, and lung compliance of 0.002 L/cm H2O should be which of the following?
 
  a. 0.25 sec
  b. 0.30 sec
  c. 0.45 sec
  d. 0.55 sec

Question 2

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

[k2629]

Answer to Question 1

ANS: B
Raw  CL = 1 time constant. This is 0.06 second in this problem. One time constant multiplied by 5, or 0.30 second, should be the inspiratory time setting for this patient.

Answer to Question 2

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.

[kaid0807]

Thanks for the timely response, appreciate it

[dantucker]

TYSM