NBRC TMC/CRT/RRT EXAM 2024 | REAL EXAM
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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
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
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
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.
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%)
(100- 30%)/ (30%-*21) = 70/9 = 8/1 or 8:1 ratio
8+1= 9
9x5 = 45 L/min
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
B. 32 mg H2O per liter of gas
A patient receiving 38 mg H2O per liter of gas from a nebulizer has a humidity deficit of which
of the following?
A. 6 mg/L
B. 9 mg/L
C. 12 mg/L
D. 18 mg/L
44-38= 6
A. 6 mg/L
,
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
E cylinder = 0.28
1900x0.28/4 = 133/60 = 2.21
Answer: C. 2 hours, 21 minutes
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
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
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
,
A. Place the patient on CPAP
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
(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
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
D. Air-entrainment mask at 40% O2
After connecting a nasal cannula to the humidifier outlet, you kink the tubing and hear a
whistling noise coming from the humidifier. Which of the following most likely has caused this?
A. The humidifier jar is cracked
B. The capillary tube in the humidifier is disconnected
C. The humidifier has no leaks
D. The top of the humidifier is not screwed on tightly
C. The humidifier has no leaks
VERSIONS WITH A STUDY GUIDE | ACCURATE AND
EXPERT VERIFIED FOR GUARANTEED PASS |
LATEST UPDATE
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
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
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
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.
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%)
(100- 30%)/ (30%-*21) = 70/9 = 8/1 or 8:1 ratio
8+1= 9
9x5 = 45 L/min
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
B. 32 mg H2O per liter of gas
A patient receiving 38 mg H2O per liter of gas from a nebulizer has a humidity deficit of which
of the following?
A. 6 mg/L
B. 9 mg/L
C. 12 mg/L
D. 18 mg/L
44-38= 6
A. 6 mg/L
,
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
E cylinder = 0.28
1900x0.28/4 = 133/60 = 2.21
Answer: C. 2 hours, 21 minutes
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
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
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
,
A. Place the patient on CPAP
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
(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
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
D. Air-entrainment mask at 40% O2
After connecting a nasal cannula to the humidifier outlet, you kink the tubing and hear a
whistling noise coming from the humidifier. Which of the following most likely has caused this?
A. The humidifier jar is cracked
B. The capillary tube in the humidifier is disconnected
C. The humidifier has no leaks
D. The top of the humidifier is not screwed on tightly
C. The humidifier has no leaks
