Author Question: Compared with a square wave flow pattern, a decelerating flow waveform has which of the fol-lowing ... (Read 95 times)

danielfitts88 · **on:** Jul 16, 2018

Compared with a square wave flow pattern, a decelerating flow waveform has which of the fol-lowing potential benefits?

1. Reduced peak pressure
2. Improved cardiac output
3. Less inspiratory work
4. Decreased volume of dead space-to-tidal volume ratio (VD/VT)
a. 1 and 3 only
b. 1, 3, and 4 only
c. 2 and 4 only
d. 2, 3, and 4 only

Question 2

In which of the following patients is positive end expiratory pressure (PEEP) most indicated?

FiO2 PaO2
a. 0.3 80 mm Hg
b. 0.5 80 mm Hg
c. 0.3 50 mm Hg
d. 0.5 50 mm Hg

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

Answer to Question 1

ANS: B
Compared with a square flow waveform, decreasing flow has been shown to reduce peak pres-sure, inspiratory work, VD/VT, and P(Aa)O2 without affecting hemodynamic values.

Answer to Question 2

ANS: C
As a rule, refractory hypoxemia exists when a patient's PaO2 cannot be maintained above 50 to 60 mm Hg with an FiO2 of 0.40 to 0.50 or more.