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Author Question: Use this figure to compute the static compliance (CS) for an intubated patient with an exhaled tidal ... (Read 163 times)

jrubin

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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)


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frre432

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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.


jrubin

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Reply 2 on: Jul 16, 2018
Great answer, keep it coming :)

atrochim

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Reply 3 on: Yesterday
Excellent

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