The most common concentration of heliox is ...

[swpotter12]

The most common concentration of heliox is ___________________ ___________.
 
  a. 50 helium:50 oxygen
  b. 60 helium:40 oxygen
  c. 70 helium:30 oxygen
  d. 80 helium:20 oxygen

Question 2

An 80 He:20 O2 mixture is being delivered to an asthmatic patient by a nonrebreather mask through an oxygen flow meter set at 8 L/min. What is the actual flow delivered to the patient?
 
  a. 10 L/min
  b. 12 L/min
  c. 14 L/min
  d. 18 L/min

[Swizqar]

Answer to Question 1

ANS: D
The most commonly used concentration of heliox is 80:20 (80 helium and 20 oxygen). This mixture provides the greatest amount of helium, and therefore the lowest density gas, without providing subambient levels of oxygen. Concentrations as low as 50 have been used effectively in patients with large airway obstructions.

Answer to Question 2

ANS: C
The conversion factor for an 80:20 heliox mixture is 1.8. 8  1.8 = 14.4 L/min.