Test Bank - Pilbeam’s Mechanical Ventilation-Physiological and Clinical Applications, 7th Edition (Cairo, 2020), Chapter 1-23 | All Chapters

,Chapter 01: Basic Terms and Concepts of Mechanical Ventilation Cairo: Pilbeam’s
Mechanical Ventilation: Physiological and Clinical Applications, 7th Edition


MULTIPLE CHOICE

1. The body’s mechanism for conducting air in and out of the lungs is known as which of the
following?
a. External respiration
b. Internal respiration
c. Spontaneous ventilation
d. Mechanical ventilation
ANS: C
The conduction of air in and out of the body is known as ventilation. Since the question asks
for the body’s mechanism, this would be spontaneous ventilation. External respiration
involves the exchange of oxygen (O2) and carbon dioxide (CO2) between the alveoli and the
pulmonary capillaries. Internal respiration occurs at the cellular level and involves movement
of oxygen from the systemic blood into the cells.

REF: pg. 2

2. Which of the following are involved in external respiration?
a. Red blood cells and body cells
b. Scalenes and trapezius muscles
c. Alveoli and pulmonary capillaries
d. External oblique and transverse abdominal muscles
ANS: C
External respiration involves the exchange of oxygen and carbon dioxide (CO2) between the
alveoli and the pulmonary capillaries. Internal respiration occurs at the cellular level and
involves movement of oxygen from the systemic blood into the cells. Scalene and trapezius
muscles are accessory muscles of inspiration. External oblique and transverse abdominal
muscles are accessory muscles of expiration.

REF: pg. 2

3. The graph that shows intrapleural pressure changes during normal spontaneous breathing is
depicted by which of the following?

, a.
b.




c.




d.




ANS: B
During spontaneous breathing, the intrapleural pressure drops from about 5 cm H2O at
endexpiration to about 10 cm H2O at end-inspiration. The graph depicted for answer B
shows that change from 5 cm H2O to 10 cm H2O.

REF: pg. 3

4. During spontaneous inspiration alveolar pressure (PA) is about: ________________.
a.
1 cm H2O
b.
+1 cm H2O
c.
0 cm H2O
d.
5 cm H2O
ANS: A
1 cm H2O is the lowest alveolar pressure will become during normal spontaneous
ventilation. During the exhalation of a normal spontaneous breath the alveolar pressure will
become 1 cm H2O.

, REF: pg. 4

5. The pressure required to maintain alveolar inflation is known as which of the following?
a.
Transairway pressure (PTA)
b.
Transthoracic pressure (PTT)
c.
Transrespiratory pressure (PTR)
d.
Transpulmonary pressure (PL)
ANS: D
The definition of transpulmonary pressure (PL) is the pressure required to maintain alveolar
inflation. Transairway pressure (PTA) is the pressure gradient required to produce airflow in
the conducting tubes. Transrespiratory pressure (PTR) is the pressure to inflate the lungs and
airways during positive-pressure ventilation. Transthoracic pressure (P TT) represents the
pressure required to expand or contract the lungs and the chest wall at the same time.

REF: pg. 4

6. Calculate the pressure needed to overcome airway resistance during positive-pressure
ventilation when the proximal airway pressure (PAw) is 35 cm H2O and the alveolar pressure
(PA) is 5 cm H2O. a.
7 cm H2O
b. 30 cm H2O
c. 40 cm H2O
d. 175 cm H2O
ANS: B
The transairway pressure (PTA) is used to calculate the pressure required to overcome airway
resistance during mechanical ventilation. This formula is PTA = Paw - PA.

REF: pg. 4

7. The term used to describe the tendency of a structure to return to its original form after
being stretched or acted on by an outside force is which of the following?
a.
Elastance
b.
Compliance
c.
Viscous resistance
d.
Distending pressure
ANS: A
The elastance of a structure is the tendency of that structure to return to its original shape
after being stretched. The more elastance a structure has, the more difficult it is to stretch.
The compliance of a structure is the ease with which the structure distends or stretches.
Compliance is the opposite of elastance. Viscous resistance is the opposition to movement