Chapter 35 Humidity and Bland Aerosol Therapy

Chapter 35  Humidity and Bland Aerosol Therapy

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. What is the point in the respiratory track where inspired gas reaches body temperature, ambient pressure, saturated (BTPS) conditions?
a.
point of thermal equilibrium
b.
hygroscopic saturation boundary
c.
thermal inversion boundary
d.
isothermic saturation boundary

ANS: D
As inspired gas moves into the lungs, it achieves BTPS conditions (body temperature, 37° C; barometric pressure; saturated with water vapor [100% relative humidity at 37° C]). This point, normally approximately 5 cm below the carina, is called the isothermic saturation boundary.

DIF: Recall REF: p. 819 OBJ: 1

2. Which of the following is FALSE about the isothermic saturation boundary (ISB)?
a.
Below the ISB, temperature and relative humidity remain constant.
b.
Above the ISB, temperature and humidity increase during exhalation.
c.
The ISB is normally located just below the larynx (vocal cords).
d.
Above the ISB, temperature and humidity decrease during inspiration.

ANS: C
This point, normally approximately 5 cm below the carina, is called the isothermic saturation boundary (ISB). Above the ISB, temperature and humidity decrease during inspiration and increase during exhalation.

DIF: Recall REF: p. 819 OBJ: 1

3. Which of the following factors cause the isothermic saturation boundary (ISB) to shift farther down into the airways?
1. decreased ambient temperature
2. increased tidal volume (VT)
3. endotracheal intubation
a.
1 and 2
b.
2 and 3
c.
1 and 3
d.
1, 2, and 3

ANS: D
The ISB shifts distally when a person breathes through the mouth rather than the nose; when he or she breathes cold, dry air; when the upper airway is bypassed (breathing through an artificial tracheal airway); or when the minute ventilation is higher than normal.

DIF: Recall REF: p. 819 OBJ: 1

4. What is the primary goal of humidity therapy?
a.
decrease airway reactivity to cold
b.
maintain normal physiologic conditions
c.
deliver drugs to the airway
d.
reduce upper airway inflammation

ANS: B
The primary goal of humidification is to maintain normal physiological conditions in the lower airways.

DIF: Recall REF: p. 819 OBJ: 3

5. Indications for warming inspired gases include all of the following except:
a.
treating a patient whose airways are reactive to cold
b.
providing humidification when the upper airway is bypassed
c.
treating a patient with a low body temperature (hypothermia)
d.
reducing upper airway inflammation or swelling

ANS: D
See Box 35-1.

DIF: Recall REF: p. 820 OBJ: 2