Which of the following is consistent with the radiographic appearance after prolonged
exposure to O2?

Which of the following factors should be used in properly selecting an O2 delivery device?
1. Knowledge of general performance of the device
2. Physician’s preference
3. Individual capabilities of the equipment

A well-designed oxygen protocol will ensure which of the following?
1. The patient undergoes initial assessment.
2. The patient is evaluated for protocol criteria.
3. The patient receives a treatment plan that is modified according to need.
4. The patient stops receiving therapy as soon as it is no longer needed.

What does 1 atmospheric pressure absolute (ATA) equal?
1. 101 kPa
2. 50 psi
3. 760 mm Hg

Which of the following are indications for capnography?
1. Evaluating the response to therapies affecting ventilation/perfusion ratio ( ) relationships
2. Determining the position of an artificial airway (trachea vs. esophagus)
3. Assessing a patient’s readiness for weaning from ventilatory support
4. Monitoring the integrity of the ventilatory circuit and artificial airway

Some strategies for minimizing the risk of fire hazard with O2 therapy include which of the
following?
1. Using the lowest effective FiO2
2. Properly educating patients and caregivers
3. Avoiding aluminum regulators and other high-risk devices
4. Mixing the oxygen with carbon dioxide.

Which of the following are advantages of the nasal cannula as a low-flow O2 delivery system?
1. Stability
2. Low cost
3. Easy application
4. Disposability

Physiologic effects of inhaled nitric oxide (NO) include which of the following?
1. Recruitment of collapsed alveoli
2. Improved blood flow to ventilated alveoli
3. Decreased pulmonary vascular resistance
4. Reduced intrapulmonary shunting

During calibration of a Clark polarographic O2 analyzer, you cannot get the sensor to read
100% when exposed to 100% O2, even after adjusting its calibration control. The unit has new
batteries. What to do?

Pulse oximeter readings are generally unreliable at saturations below what level?

Which of the following are true about absorption atelectasis?
1. It can occur only when breathing supplemental O2.
2. Its risk is increased in patients breathing at low tidal volumes (VT values).
3. Its risk is decreased through the natural “sigh” mechanism.
4. It results in an increase in the physiologic shunt fraction.

A physician orders supplemental O2 for a patient through a nasal cannula at a flow of 12
L/min. When you ask what the goal is, the physician states that the patient should receive
approximately 60% O2. Which of the following should you recommend?
a. The O2 should be given through a reservoir mask at 10 L/min.
b. The cannula flow should be set to 15 instead of 12 L/min.
c. The O2 should be given through a simple mask set at 5 to 12 L/min.
d. The O2 should be given through a simple mask set at 12 to 15 L/min.

Criteria for initiating hyperbaric oxygen (HBO) therapy on an adult patient suspected of
suffering from acute carbon monoxide poisoning include which of the following?
1. History of unconsciousness
2. Carboxyhemoglobin saturation less than 20%
3. Presence of neurologic abnormality
4. Presence of cardiac instability

While checking a polarographic (Clark) electrode, you determine that the device fails to read
100% when exposed to pure O2. Which of the following actions would be the proper first
step?

You are asked to calibrate an O2 analyzer. Which of the following gases would you use for
this procedure?
1. 100% oxygen
2. 50% oxygen
3. 21% oxygen (room air)

Which of the following statements are true about low-flow O2 delivery systems?
1. The greater the patient’s inspiratory flow, the greater is the FiO2.
2. All low-flow devices provide variable O2 concentrations.
3. The O2 provided by a low-flow device is diluted with air.
4. The patient’s flow usually exceeds that from a low-flow device.

A well-fitted nonrebreathing mask, adjusted so that the patient’s inhalation does not deflate
the bag (flows approximately 10 L/min), should provide inspired O2 concentrations in what
range?

At an FiO2 of 1, what is the approximate half-life of blood carboxyhemoglobin?
&
During hyperbaric oxygen (HBO) therapy at 3 ATA, what is the approximate half-life of
blood carboxyhemoglobin?

What is the most common technique used to measure CO2 in respiratory gases?

You return to a patient’s room 20 min after drawing an ABG. Which of the following should
you check at this time?
1. Puncture site for hematoma
2. Adequacy of distal circulation
3. Prothrombin or partial thromboplastin times

Disadvantages of standard O2 masks include which of the following?
1. Being difficult to apply to patients.
2. Patient discomfort (straps and heat).
3. Increasing the risk of aspiration.
4. Must be removed for eating.

You must deliver the highest possible FiO2 to a 67-year-old man with pulmonary edema
breathing at a rate of 35/min. Which of the following O2 delivery systems would be most
appropriate?
a. Nonrebreathing mask at 12 to 15 L/min
b. Simple mask at 12 to 15 L/min
c. Partial rebreathing mask at 12 to 15 L/min
d. Aerosol mask with nebulizer set to 100%

Which of the following conditions can be treated with hyperbaric oxygen (HBO) therapy?
1. Carbon monoxide poisoning
2. Septic shock
3. Air embolism
4. Clostridial gangrene

What is the measurement of CO2 in respiratory gases called?

What size needle would you recommend to obtain an ABG sample through percutaneous
puncture of an infant?