Author Question: Use this figure to compute the static compliance (CS) for an intubated patient with an exhaled tidal ... (Read 169 times)

jrubin · **on:** Jul 16, 2018

Use this figure to compute the static compliance (CS) for an intubated patient with an exhaled tidal volume (VT) of 500 mL.

a. 14 mL/cm H2O
b. 20 mL/cm H2O
c. 33 mL/cm H2O
d. 50 mL/cm H2O

Question 2

Evaluate the combinations of compliance and resistance and select the combination that will cause the lungs to empty slowest.

a. CS = 0.05 L/cm H2O Raw = 2 cm H2O/(L/sec)
b. CS = 0.05 L/cm H2O Raw = 6 cm H2O/(L/sec)
c. CS = 0.03 L/cm H2O Raw = 5 cm H2O/(L/sec)
d. CS = 0.03 L/cm H2O Raw = 8 cm H2O/(L/sec)

frre432 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: D
Cs = Pplateau EEP; the Pplateau in the figure is 20 cm H2O and the PEEP is 10 cm H2O.

Answer to Question 2

ANS: B
Use the time constant formula, TC = C R, to determine the time constant for each choice. The combination with the longest time constant will empty the slowest. The time constant for A is 0.1 second, B is 0.3 second, C is 0.15 second, and D is 0.24 second. To find out how many seconds for emptying, multiply the time constant by 5.