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
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.
You might also like to view...
Which is the medial attachment of trapezius?
a. Occiput b. Nuchal ligament c. Spinous processes of C7–T12 d. All of above
____ is the Standard for a Fire Department Self-Contained Breathing Apparatus Program.
A. NFPA 1404 B. NFPA 1500 C. NFPA 1981 D. NFPA 1982
To minimize medication error, the prescription should be written in pencil
Indicate whether the statement is true or false
In ________, thousands of people participate in new drug testing
Fill in the blank(s) with the appropriate word(s).