Question 1

Before analysis of oxygen percentage,the analyzer should be calibrated to which percentage?

Accepted Answer

Calibrate the oxygen analyzer at a)21% or room air.Following this,b)calibrate the analyzer at 100% by immersing the sensor into a reservoir of 100% oxygen.After calibrating the analyzer at 100%,return the sensor to room air.The reading should stabilize back to 21% within 1 minute.

Question 2

The practitioner notes that a patient has been on a partial rebreathing mask for 4 days.The chest x-ray indicates bilateral atelectasis in both bases.What would be the most likely reason for this finding?

Accepted Answer

In the patient who is compromised and breathing very shallowly,absorption atelectasis can be quite pronounced.As the nitrogen is washed out and replaced by oxygen,the oxygen is absorbed into the blood.As more and more volume is absorbed,the alveolar volume decreases,resulting in a diffuse microatelectasis.

Question 3

A patient has an oxygen saturation of 95% on room air.The patient's vital signs reveal a heart rate of 120/minute with occasional PVCs,a respiratory rate of 38/minute,and mild cyanosis of the patient's mucous membranes.What should be done?

Accepted Answer

The answer of A patient has an oxygen saturation of...

Question 4

Which of the following statements is TRUE regarding the use of an oxygen analyzer?

Accepted Answer

To measure the FIO₂,sample the gas as close to the patient as possible.Whenever possible,oxygen concentrations should be measured and documented in the patient's chart at least once each shift,or every 8 hours.

Question 5

Which type of oxygen analyzer uses an oxidation-reduction reaction to measure the FO₂ of an oxygen sample?

Accepted Answer

The a)galvanic oxygen analyzer and b)polarographic oxygen analyzer both use a chemical reaction of oxygen combining with water and electrons to form hydroxyl ions.This reaction is a type of an oxidation-reduction reaction.

Question 6

Children receiving oxygen via an enclosure are at risk for a fire hazard if which of the following is used in the enclosure?
I.Battery-powered electric toys
II.Radio
III.Electrically powered appliances

Accepted Answer

Oxygen enclosures with large volumes of oxygen-enriched air can pose a considerable fire hazard if not treated properly.Children in enclosures should not be allowed to have I)battery-powered electric toys,II)radios,or III)other electrically powered appliances.If possible,limit the child's playthings to stuffed animals or other nonmetallic objects incapable of generating sparks.

Question 7

The respiratory care practitioner receives an order for a simple oxygen mask at 3 LPM.How should the practitioner proceed?

Accepted Answer

The practitioner should call the physician to clarify the order and,if necessary,explain the hazard of the low flowrate to the simple mask.Simple oxygen masks,partial rebreathing masks,and nonrebreathing masks generally should not be operated at a flow of less than 5 L/min.This higher flow will ensure that the exhaled carbon dioxide is adequately flushed from the mask.

Question 8

During oxygen rounds,a patient on a nasal cannula has an oxygen saturation of 89%.No flow is felt coming from the device.What could be the problem?

Accepted Answer

The answer of During oxygen rounds,a patient on a nasal...

Question 9

A patient has been on a non-rebreathing mask for 36 hours.What signs should the practitioner watch for and why?

Accepted Answer

The answer of A patient has been on a non-rebreathing...

Question 10

A newborn is admitted into the nursery and is started on an FIO₂ of 35% through an isolette.The patient's arterial blood gas is drawn and his PaO₂ measured to be 88 mmHg.What would be the associated risk for this patient?

Accepted Answer

Careful monitoring of blood gases (to maintain the PaO₂ between 50 and 80-mm Hg)is important to prevent retinopathy of prematurity (ROP).

Question 11

Which one of the following side effects of oxygen therapy should be watched for in a COPD patient with hypercapnia?

Accepted Answer

Oxygen induced hypoventilation is a risk for a patient with COPD with hypercapnia.As a result of CO₂ retention,the body's normal stimulus to breathe in response to high levels of CO₂ is not as responsive.The patient with chronic obstructive lung disease is breathing primarily on an oxygen stimulus rather than a carbon dioxide stimulus.

Question 12

A respiratory care practitioner sets up an oxygen device on a patient.How should the practitioner document the oxygen?

Accepted Answer

The practitioner should document on the patient's chart a)the flowrate,b)the oxygen device,and c)the date and time when the therapist initiated therapy.

Question 13

The oxygen percentage being delivered to a newborn by way of an oxygen hood needs to be analyzed.Where should the oxygen within the hood be analyzed?

Accepted Answer

To measure the FIO₂,sample the gas as close to the patient as possible.

Quiz 13: Oxygen Administration