NBRC Mock TMC Exam Review | High-Yield Questions,
Detailed Rationales, ABG Interpretation, Mechanical
Ventilation, Clinical Scenarios & Comprehensive Study
Guide| Most Frequently Tested and 100% Accurate |
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A patient is receiving O2 from an E cylinder at 4 L/min through a nasal cannula.
The cylinder pressure is 1900 psig. How long will the cylinder run until it is
empty?
A. 47 min
B. 1.7 h
C. 2.2 h
D. 3.6 h
RATIONALE: E cylinder = 0.28
1900x0.28/4 = 133/60 = 2.21
Answer: C. 2 hours, 21 minutes
Given the following data, what is the patient's total arterial O2 content?
pH: 7.41
PaCO2: 37 mmHg
PaO2: 88 mmHg
HCO3: 26 mEq/L
SaO2: 95%
Hb: 14 g/dL
A. 12 mL/dL
B. 14 mL/dL
C. 16 mL/dL
D. 18 mL/dL
,RATIONALE: (Hb x 1.36 x SaO2) + (0.003 x PaO2)
(14 x 1.36 x 0.95) + (0.003 x 88)
18.088 + 0.264
= 18.352
ANSWER: D. 18 mL/dL
After the Respiratory Therapist sets up a nonrebreathing mask on a patient at a
flow rate of 10 L/min, the reservoir bag collapses before the patient finishes
inspiring. The RT should do which of the following?
A. Change to a simple mask at a flow rate of 10 L/min
B. Remove the one-way valve from the exhalation port.
C. Place the patient on continuous positive airway pressure (CPAP)
D. Increase the flow rate to 15 L/min
ANSWER: D. Increase the flow rate to 15 L/min
A patient with carbon monoxide (CO) poisoning can best be treated with which
of the following therapies?
A. Nasal Cannula at 6 L/min
B. Simple O2 mask at 10 L/min
C. CPAP and 60% O2
D. Nonrebreathing mask
ANSWER: D. Nonrebreathing mask
The following blood gas levels have been obtained from a patient using a 60%
aerosol mask.
pH: 7.47
PaCO2: 31 mmHg
PaO2: 58 mmHg
What should the RT recommend at this time?
A. Place the patient on CPAP
B. Increase the O2 to 70%
C. Intubate and place the patient on mechanical ventilation
D. Change to a nonrebreathing mask
ANSWER: A. Place the patient on CPAP
,The respiratory therapist receives an order to set up a moderate level of O2 on a
patient who arrives in the ED breathing at a rate of 35 breaths/min. Which of the
following O2 delivery devices is most appropriate to use in this situation?
A. Simple O2 mask at 10 L/min
B. Nasal cannula at 4 L/min
C. NRB Mask at 15 L/min
D. Air-entrainment mask at 40% O2
ANSWER: D. Air-entrainment mask at 40% O2
A severe COPD patient arrives in the emergency department on a 2 L/min nasal
cannula. Arterial blood gas results follow:
pH: 7.32
PaCO2: 67 mmHg
PaO2: 62 mmHg
HCO3: 38 mEq/L
Which of the following is the most appropriate recommendation?
A. Increase the liter flow to 4 L/min
B. Maintain the current O2 level
C. Institute noninvasive positive pressure ventilation (NPPV)
D. Place on a NRB mask at 12 L/min
ANSWER: B. Maintain the current O2 level
The physician has ordered O2 to be set up on a patient who has a spontaneous
tidal volume of 500 mL and an inspiratory time of 1 second. Which of the
following O2 delivery devices will deliver a flow that meets or exceeds this
patient's inspiratory flow?
A. 35% air-entrainment mask at 6 L/min
B. 60% aerosol mask at 12 L/min
C. NRB mask at 15 L/min
D. Simple O2 mask at 10 L/min
RATIONALE: 500 mL = 0.5 L
0.5/1 = 0.5 L/s (change L/s to ?/min by multiplying by 60
0.5 L x 60= 30 L/min
Select the device that delivers a flow of at least 30L/min
, ANSWER: A. 35% air-entrainment mask at 6 L/min
A patient breathing 50% oxygen has a PaO2 of 248 torr. Which of the following
should the RT recommend?
A. Discontinue O2 therapy
B. Decrease the oxygen to 30%
C. Titrate oxygen to maintain an SpO2 > 93%
D. Repeat the blood gases because the PaO2 is not possible on this FiO2.
ANSWER: C. Titrate oxygen to maintain an SpO2 > 93%
Explanation: A PaO2 of 250 torr is normal on 50% O2. Remember, to determine
the normal PaO2 on any given O2%, multiply the O2% by 5. This is an
approximation. If titrate was not a choice, then you would discontinue the
oxygen.
A patient is receiving 30% oxygen via an air-entrainment mask at a flow of 5
L/min. The total flow delivered by this device is which of the following?
A. 36 L/min
B. 45 L/min
C. 54 L/min
D. 60 L/min
(*Use 21 with O2 % less than 40%)
RATIONALE:
(100- 30%)/ (30%-*21) = 70/9 = 8/1 or 8:1 ratio
8+1= 9
9x5 = 45 L/min
ANSWER: B. 45 L/min
Secretions tend to become thicker if the inspired air has which of the following
characteristics?
A. A relative humidity of 100% at body temperature
B. 32 mg H2O per liter of gas
C. A water vapor pressure of 47 mmHg
D. 48 mg H2O per liter of gas
Detailed Rationales, ABG Interpretation, Mechanical
Ventilation, Clinical Scenarios & Comprehensive Study
Guide| Most Frequently Tested and 100% Accurate |
Latest Exam and Brand New Version!!!
A patient is receiving O2 from an E cylinder at 4 L/min through a nasal cannula.
The cylinder pressure is 1900 psig. How long will the cylinder run until it is
empty?
A. 47 min
B. 1.7 h
C. 2.2 h
D. 3.6 h
RATIONALE: E cylinder = 0.28
1900x0.28/4 = 133/60 = 2.21
Answer: C. 2 hours, 21 minutes
Given the following data, what is the patient's total arterial O2 content?
pH: 7.41
PaCO2: 37 mmHg
PaO2: 88 mmHg
HCO3: 26 mEq/L
SaO2: 95%
Hb: 14 g/dL
A. 12 mL/dL
B. 14 mL/dL
C. 16 mL/dL
D. 18 mL/dL
,RATIONALE: (Hb x 1.36 x SaO2) + (0.003 x PaO2)
(14 x 1.36 x 0.95) + (0.003 x 88)
18.088 + 0.264
= 18.352
ANSWER: D. 18 mL/dL
After the Respiratory Therapist sets up a nonrebreathing mask on a patient at a
flow rate of 10 L/min, the reservoir bag collapses before the patient finishes
inspiring. The RT should do which of the following?
A. Change to a simple mask at a flow rate of 10 L/min
B. Remove the one-way valve from the exhalation port.
C. Place the patient on continuous positive airway pressure (CPAP)
D. Increase the flow rate to 15 L/min
ANSWER: D. Increase the flow rate to 15 L/min
A patient with carbon monoxide (CO) poisoning can best be treated with which
of the following therapies?
A. Nasal Cannula at 6 L/min
B. Simple O2 mask at 10 L/min
C. CPAP and 60% O2
D. Nonrebreathing mask
ANSWER: D. Nonrebreathing mask
The following blood gas levels have been obtained from a patient using a 60%
aerosol mask.
pH: 7.47
PaCO2: 31 mmHg
PaO2: 58 mmHg
What should the RT recommend at this time?
A. Place the patient on CPAP
B. Increase the O2 to 70%
C. Intubate and place the patient on mechanical ventilation
D. Change to a nonrebreathing mask
ANSWER: A. Place the patient on CPAP
,The respiratory therapist receives an order to set up a moderate level of O2 on a
patient who arrives in the ED breathing at a rate of 35 breaths/min. Which of the
following O2 delivery devices is most appropriate to use in this situation?
A. Simple O2 mask at 10 L/min
B. Nasal cannula at 4 L/min
C. NRB Mask at 15 L/min
D. Air-entrainment mask at 40% O2
ANSWER: D. Air-entrainment mask at 40% O2
A severe COPD patient arrives in the emergency department on a 2 L/min nasal
cannula. Arterial blood gas results follow:
pH: 7.32
PaCO2: 67 mmHg
PaO2: 62 mmHg
HCO3: 38 mEq/L
Which of the following is the most appropriate recommendation?
A. Increase the liter flow to 4 L/min
B. Maintain the current O2 level
C. Institute noninvasive positive pressure ventilation (NPPV)
D. Place on a NRB mask at 12 L/min
ANSWER: B. Maintain the current O2 level
The physician has ordered O2 to be set up on a patient who has a spontaneous
tidal volume of 500 mL and an inspiratory time of 1 second. Which of the
following O2 delivery devices will deliver a flow that meets or exceeds this
patient's inspiratory flow?
A. 35% air-entrainment mask at 6 L/min
B. 60% aerosol mask at 12 L/min
C. NRB mask at 15 L/min
D. Simple O2 mask at 10 L/min
RATIONALE: 500 mL = 0.5 L
0.5/1 = 0.5 L/s (change L/s to ?/min by multiplying by 60
0.5 L x 60= 30 L/min
Select the device that delivers a flow of at least 30L/min
, ANSWER: A. 35% air-entrainment mask at 6 L/min
A patient breathing 50% oxygen has a PaO2 of 248 torr. Which of the following
should the RT recommend?
A. Discontinue O2 therapy
B. Decrease the oxygen to 30%
C. Titrate oxygen to maintain an SpO2 > 93%
D. Repeat the blood gases because the PaO2 is not possible on this FiO2.
ANSWER: C. Titrate oxygen to maintain an SpO2 > 93%
Explanation: A PaO2 of 250 torr is normal on 50% O2. Remember, to determine
the normal PaO2 on any given O2%, multiply the O2% by 5. This is an
approximation. If titrate was not a choice, then you would discontinue the
oxygen.
A patient is receiving 30% oxygen via an air-entrainment mask at a flow of 5
L/min. The total flow delivered by this device is which of the following?
A. 36 L/min
B. 45 L/min
C. 54 L/min
D. 60 L/min
(*Use 21 with O2 % less than 40%)
RATIONALE:
(100- 30%)/ (30%-*21) = 70/9 = 8/1 or 8:1 ratio
8+1= 9
9x5 = 45 L/min
ANSWER: B. 45 L/min
Secretions tend to become thicker if the inspired air has which of the following
characteristics?
A. A relative humidity of 100% at body temperature
B. 32 mg H2O per liter of gas
C. A water vapor pressure of 47 mmHg
D. 48 mg H2O per liter of gas
