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Chapter 1; Basic Terms and Concepts of Mechanical Ventilation
Test Bank
MULTIPLE CHOICE r4
1. The body’s mechanism for conducting air in and out of the
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lungsi s known as which of the following?
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a. External respiration r4
b. Internal respiration r4
c. Spontaneous ventilation r 4
d. Mechanical ventilation r 4
ANS: C r4
The conduction of air in and out of the body is known as ventilation
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. Since the question asks for the body’s mechanism, this would be
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spontaneous ventilation. External respiration involves the
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exchang e of oxygen (O2) and carbon dioxide (CO2) between the
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alveoli and the pulmonary capillaries. Internal respiration
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occurs at the cellul ar level and involves movement ofoxygen
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from the systemic blood i nto the cells.
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DIF: 1 REF: r 4 pg. 3 r4
2. Which of the following are involved in external respiration?
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a. Red blood cells and body cells r4 r4 r4 r4 r4
b. Scalenes and trapezius r4 r4
muscles r4
c. Alveoli and pulmonary r4 r4
capillaries r4
d. External oblique and r4 r4
transverse abdominal r4 r4
muscles r4
ANS: C r4
External respiration involves the exchange of oxygen and carbond
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ioxide (CO2) between the alveoli and the pulmonary capillaries. Int
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ernal respiration occurs at the cellular level and involves
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r4movemen t of oxygen from the systemic blood into the cells.
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Scalene and trapezius muscles are accessory muscles of inspiratio
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n. External oblique and transverse abdominal musclesare
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accesso ry muscles of expiration.
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DIF: 1 REF: r 4 pg. 3 r4
3. The graph that shows intrapleural pressure changes
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during normal spontaneous breathing is depicted by which
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of the f ollowing?
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a.
b.
c.
d.
ANS: B r4
During spontaneous breathing the intrapleural pressure drops
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fr om about -5 cm H2O at end-expiration to about -
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10 cm H2O atend-
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inspiration. The graph depicted for answer B shows that change
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from -5 cm H2O to -10 cm H2O.
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DIF: 1 REF: r 4 pg. 4 r4
4. During spontaneous inspiration alveolar pressure (PA) is about:
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.
a. - 1 cm H2O r4 r4 r4
b. + 1 cm H2O r4 r4 r4
c. 0 cm H2O r4 r4
d. 5 cm H2O r4 r4
ANS: A r4
-
1 cm H2O is the lowest alveolar pressure will become during nor
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mal spontaneous ventilation. During the exhalation of a
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normal spontaneous breath the alveolar pressure will become
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+1cm H2O.
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DIF: 1 REF: r 4 pg. 3 r4
5. The pressure required to maintain alveolar inflation is known as
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which of the following?
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a. Transairway pressure (PTA ) r4 r4 r 4
b. Transthoracic pressure (PTT) r4 r4
c. Transrespiratory pressure (PTR) r 4 r 4
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d. Transpulmonary r 4 pressure r 4 (PL)
ANS: D r4
The definition of transpulmonary pressure (PL) is the pressure requi
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red to maintain alveolar inflation. Transairway pressure (PTA )is
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the pressure gradient required to produce airflow in the conducting
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tub es. Transrespiratory pressure (PTR) is the pressure to inflate
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the lun gs and airways during positive pressure ventilation.
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Transthoracic p ressure (PTT) represents the pressure required
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to expand or contrac t the lungs and the chest wall at thesame
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time.
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DIF: 1 REF: r 4 pg. 3 r4
6. Calculate the pressure needed to overcome airway resistance d
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uring positive pressure ventilation when the proximal airway pre
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ssure (PAw) is 35 cm H2O and the alveolar pressure (PA) is 5
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cmH2O.
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a. 7 cm H2O r4 r4
b. 30 cm H2O r4 r4
c. 40 cm H2O r4 r4
d. 175 cm H2O r4 r4
ANS: B r4
The transairway pressure (PTA ) is used to calculate the pressurere
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quired to overcome airway resistance during mechanical ventilati
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on. This formula is PTA = Paw - PA.
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DIF: 2 REF: r 4 pg. 3 r4
7. The term used to describe the tendency of a structure to return
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toit s original form after being stretched or acted on by an outside
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force is which of the following?
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a. Elastance
b. Compliance
c. Viscous resistance r4
d. Distending pressure r4