The statement that describes the alveolus shown in Figure 1-1 is ...

[rlane42]

The statement that describes the alveolus shown in Figure 1-1 is which of the following?
 
  1. Requires more time to fill than a normal alveolus.
  2. Fills more quickly than a normal alveolus.
  3. Requires more volume to fill than a normal alveolus.
  4. More pressure is needed to achieve a normal volume.
  a. 1 and 3 only
  b. 2 and 4 only
  c. 2 and 3 only
  d. 1, 3, and 4

Question 2

Calculate airway resistance (Raw) for a ventilator patient, in cm H2O/L/sec, with the following information: Peak inspiratory pressure (PIP) is 20 cm H2O, plateau pressure (Pplateau) is 15 cm H2O, PEEP is 5 cm H2O, and set flow rate is 50 L/min.
 
  a. 5 Raw
  b. 6 Raw
  c. 10 Raw
  d. 15 Raw

[reelove4eva]

Answer to Question 1

ANS: B
The figure shows a low-compliant unit, which has a short time constant. This means it takes less time to fill and empty and will require more pressure to achieve a normal volume. Lung units that require more time to fill are high-resistance units. Lung units that require more volume to fill than normal are high-compliance units.

Answer to Question 2

ANS: B
Raw = (PIP  Pplateau)/flow and flow is in L/sec.

[rlane42]

Thanks for the timely response, appreciate it

[steff9894]

TYSM