The formula used for the calculation of static compliance (CS) is ...

[cagreen833]

The formula used for the calculation of static compliance (CS) is which of the following?
 
  a. (Peak inspiratory pressure (PIP)  EEP)/tidal volume (VT)
  b. (Plateau pressure (Pplateau)  EEP)/tidal vo-lume (VT)
  c. Tidal volume/(plateau pressure  EEP)
  d. Tidal volume/(peak pressure (PIP)  pla-teau pressure (Pplateau))

Question 2

The respiratory therapist should expect which of the following findings while ventilating a pa-tient with acute respiratory distress syndrome (ARDS)?
 
  a. An elevated plateau pressure (Pplateau)
  b. A decreased elastic resistance
  c. A low peak inspiratory pressure (PIP)
  d. A large transairway pressure (PTA) gradient

[IAPPLET]

Answer to Question 1

ANS: C
CS = VT/(Pplateau  EEP)

Answer to Question 2

ANS: A
ARDS is a pathological condition that is associated with a reduction in lung compliance. The formula for static compliance (CS) utilizes the measured plateau pressure (Pplateau) in its denomi-nator (CS = VT /(Pplateau  EEP). Therefore, with a consistent exhaled tidal volume (VT), an ele-vated Pplateau will decrease CS.