Calculate the inspiratory time necessary to ensure 98% of the volume is delivered to a patient with a Cs = 40 mL/cm H2O and the Raw = 1 cm H2O/(L/sec)
a. 0.04 second
b. 0.16 second
c. 1.6 second
d. 4.0 seconds
ANS: B
Time constant = C (L/cm H2O) ? R (cm H2O/(L/sec)). 98% of the volume will be delivered in 4 time constants. Therefore, multiply 4 times the time constant.
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