Evaluate the combinations of compliance and resistance and select the combination that will cause the lungs to fill fastest
a. Cs = 0.1 L/cm H2O Raw = 1 cm H2O/(L/sec)
b. Cs = 0.1 L/cm H2O Raw = 10 cm H2O/(L/sec)
c. Cs = 0.03 L/cm H2O Raw = 1 cm H2O/(L/sec)
d. Cs = 0.03 L/cm H2O Raw = 10 cm H2O/(L/sec)
ANS: C
Use the time constant formula, TC = C ? R, to determine the time constant for each choice. The time constant for answer A is 0.1 sec. The time constant for answer B is 1 sec. The time constant for answer C is 0.03 sec, and the time constant for answer D is 0.3 sec. The product of multiply-ing the time constant by 5 is the inspiratory time needed to deliver 100% of the volume.
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