Which of the following are disadvantages of the nasal cannula? 1. ...

[stevenposner]

Which of the following are disadvantages of the nasal cannula? 1. Pressure necrosis 2. Drying nasal mucosa 3. FIO2 not precise 4. Claustrophobia
 
  a. 1 and 4 c. 1, 2, and 3
  b. 1 and 2 d. 2 and 3

Question 2

The characteristic(s) of low-flow devices is (are): 1. fractional inspired oxygen (FIO2) from 0.22 to 0.60. 2. make use of a nasal cannula. 3. make use of a Venturi mask. 4. make use of a transtracheal catheter.
 
  a. 1, 2, and 4 c. 1
  b. 1 and 4 d. 1, 2, 3, and 4

[aadams68]

Answer to Question 1

ANS: C
With straight prongs, oxygen flow is directed toward the superior aspects of the nasal cavity, thus promoting turbulent flow; with curved prongs, oxygen entering the nose is directed across the nasal turbinate, thus enhancing laminar flow as the gas flows through the nasal cavity. Thus, both types of prongs can cause the aforementioned disadvantages.

Answer to Question 2

ANS: A
All of the choices are low-flow devices except for a Venturi mask. A Venturi mask is an air-entrainment device, all of which are considered to be high-flow devices. Therefore, Venturi masks deliver a precise FIO2.