NBRC TMC PRACTICE QUESTIONS & CORRECT VERIFIED
ANSWERS {2025|26} GRADED A+
1. Which of the following is needed to calculate alveolar oxygen tension?
A. VD/VT, PAO2
B. BP and FiO2
C. PetCO2 and PaO2
D. QS/QT, deadspace ANS B.
Barometric pressure, FiO2, and PaO2 are all included in the formula (BP stands for
barometric pressure)
2. L/min/m2 is the unit of measure for
A. Systemic vascular resistance
B. Cardiac output
https://www.stuvia.com/user/Mboffin
, C. Cardiac index
D. Stroke volume ANS C.
3. A spontaneously breathing patient has the following arterial blood gas
results
pH 7.38 PaCO2 42 mmHgPaO2 76 mmHgHCO3- 24 mEq/LBE 0 mEq/L
Which of the following supplemental oxygen levels is most appropriate?
A. 2 L/min nasal cannula
B. 5 L/min nasal cannula
C. non-rebreathing mask
D. Venturi mask at 30% ANS B.
A patient who is showing signs of hypoxemia should receive supplemental oxygen.
If the patient is not a COPD patient and the situation is not an emergency, then the
proper supplemental oxygen is an adult therapeutic dose, which is 40% to 55%. Of
the options available only 5 L/min nasal cannula will approach this. Other options
are either insufficient or too much.
4. Left heart failure would be manifested in which of the following values?
A. CVP and mPAP
B. mPAP and wedge pressure
C. MAP and SVR
D. cardiac output and wedge pressure ANS D.
The function of the left heart, specifically the left ventricle, is best assessed hemo-
dynamically by looking at those values that precede and come after the left heart. In
this case pulmonary capillary wedge pressure and cardiac output (or cardiac index)
are the values found before and after the left heart.
https://www.stuvia.com/user/Mboffin
, 5. Which of the following findings is most closely associated with increased
airway resistance?
A. reduced SpO2
B. accessory muscle use
C. altered P50
https://www.stuvia.com/user/Mboffin
, D. increased PetCO2 ANS B.
Of the options given, use of accessory muscles is most closely associated with an
increase in airway resistance. This is especially true with patients who have asthma
or other types of upper airway inflammation or bronchoconstriction.
6. For a patient receiving volume-controlled mechanical ventilation, the lower
inflection point on a pressure-volume loop can best be described as ANS
A. amount of pressure required to keep the alveoli and small airways open
B. optimal PEEP
C. minimal PEEP
D. upper limit of residual volume ANS A.
The lowest inflection point on a pressure-volume ventilator graphic is an indication
of the minimum pressure needed to keep alveoli open.
7. The results of a V/Q scan shows poor perfusion with adequate ventilation.
A chest radiograph shows a wedge-shaped infiltrate over the right lung field.
The patient most likely has
A. fluid overload
B. ARDS
C. a pulmonary embolism
D. pneumonia ANS C.
A VQ scan that shows poor perfusion but adequate ventilation is most closely
associated with a pulmonary embolism. Supportive data is found in the radiological
report of wedge-shaped infiltrates.
8. The respiratory therapist notes in the medical record of a 65-year-old male
https://www.stuvia.com/user/Mboffin 4 B/ B251
ANSWERS {2025|26} GRADED A+
1. Which of the following is needed to calculate alveolar oxygen tension?
A. VD/VT, PAO2
B. BP and FiO2
C. PetCO2 and PaO2
D. QS/QT, deadspace ANS B.
Barometric pressure, FiO2, and PaO2 are all included in the formula (BP stands for
barometric pressure)
2. L/min/m2 is the unit of measure for
A. Systemic vascular resistance
B. Cardiac output
https://www.stuvia.com/user/Mboffin
, C. Cardiac index
D. Stroke volume ANS C.
3. A spontaneously breathing patient has the following arterial blood gas
results
pH 7.38 PaCO2 42 mmHgPaO2 76 mmHgHCO3- 24 mEq/LBE 0 mEq/L
Which of the following supplemental oxygen levels is most appropriate?
A. 2 L/min nasal cannula
B. 5 L/min nasal cannula
C. non-rebreathing mask
D. Venturi mask at 30% ANS B.
A patient who is showing signs of hypoxemia should receive supplemental oxygen.
If the patient is not a COPD patient and the situation is not an emergency, then the
proper supplemental oxygen is an adult therapeutic dose, which is 40% to 55%. Of
the options available only 5 L/min nasal cannula will approach this. Other options
are either insufficient or too much.
4. Left heart failure would be manifested in which of the following values?
A. CVP and mPAP
B. mPAP and wedge pressure
C. MAP and SVR
D. cardiac output and wedge pressure ANS D.
The function of the left heart, specifically the left ventricle, is best assessed hemo-
dynamically by looking at those values that precede and come after the left heart. In
this case pulmonary capillary wedge pressure and cardiac output (or cardiac index)
are the values found before and after the left heart.
https://www.stuvia.com/user/Mboffin
, 5. Which of the following findings is most closely associated with increased
airway resistance?
A. reduced SpO2
B. accessory muscle use
C. altered P50
https://www.stuvia.com/user/Mboffin
, D. increased PetCO2 ANS B.
Of the options given, use of accessory muscles is most closely associated with an
increase in airway resistance. This is especially true with patients who have asthma
or other types of upper airway inflammation or bronchoconstriction.
6. For a patient receiving volume-controlled mechanical ventilation, the lower
inflection point on a pressure-volume loop can best be described as ANS
A. amount of pressure required to keep the alveoli and small airways open
B. optimal PEEP
C. minimal PEEP
D. upper limit of residual volume ANS A.
The lowest inflection point on a pressure-volume ventilator graphic is an indication
of the minimum pressure needed to keep alveoli open.
7. The results of a V/Q scan shows poor perfusion with adequate ventilation.
A chest radiograph shows a wedge-shaped infiltrate over the right lung field.
The patient most likely has
A. fluid overload
B. ARDS
C. a pulmonary embolism
D. pneumonia ANS C.
A VQ scan that shows poor perfusion but adequate ventilation is most closely
associated with a pulmonary embolism. Supportive data is found in the radiological
report of wedge-shaped infiltrates.
8. The respiratory therapist notes in the medical record of a 65-year-old male
https://www.stuvia.com/user/Mboffin 4 B/ B251
