Oxygenation Assessments

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Question 1
Free
Multiple Choice

When a sample of arterial blood is analyzed for the pressure of oxygen (PaO?), the value comes from the:

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A

blood plasma.

B

leukocytes.

C

hemoglobin.

D

erythrocytes.

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Question 2
Free
Multiple Choice

A patient has been exposed to carbon monoxide during a house fire. An ABG result shows a normal PaO?. How should the patient's PaO? value be interpreted?

Choose correct answer/s
A

The PaO2 is being falsely elevated by the carbon monoxide.

B

The PaO2 is being falsely decreased by the carbon monoxide.

C

The PaO2 is accurate.

D

The PaO2 is a false measurement because the presence of carbon monoxide makes the analyzer unable to determine the PaO2.

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Question 3
Free
Multiple Choice

A person's C(a-v)O? increases in all of the following situations EXCEPT:

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A

seizures.

B

peripheral shunting.

C

hyperthermia.

D

exercise.

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Question 4
Free
Multiple Choice

A sample of blood has been taken from a patient's pulmonary artery. What mixed venous oxygen saturation value (SvO?) would indicate that the patient is normal?

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A

40 mm Hg

B

95 mm Hg

C

75%

D

97%

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Question 5
Free
Multiple Choice

A patient has a chronic respiratory disorder and vasoconstriction of her pulmonary vascular system. What is the chief control over this vasoconstriction?

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A

Low PAO2

B

Low PaO2

C

High PaCO2

D

High pH

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Question 6
Multiple Choice

A condition that will cause hypoxic hypoxia is:

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A
cyanosis.
B
decreased cardiac output or heart failure.
C
hypoventilation from an overdose of a sedative medication.
D
carbon monoxide poisoning.
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Question 7
Multiple Choice

A condition that will cause anemic hypoxia is:

Choose correct answer/s
A
cyanide poisoning.
B
decreased cardiac output or heart failure.
C
polycythemia.
D
carbon monoxide poisoning.
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Question 8
Multiple Choice

The respiratory therapist is evaluating a patient in the intensive care unit who shows signs of tissue hypoxia. Laboratory results reveal the following: HgB 14.8 grams, CaO? 19.6 vol. %, PaO? 102 mm Hg, a-v difference 9.8 vol. %, PvO? 24 mm Hg. Based on these results, which of the following types of hypoxia does this patient have?

Choose correct answer/s
A
Hypoxic hypoxia
B
Anemic hypoxia
C
Circulatory hypoxia
D
Histotoxic hypoxia
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Question 9
Multiple Choice

The respiratory therapist is reviewing a patient's electronic medical record to try to verify if the patient has tissue hypoxia. Which of the following laboratory values is MOST likely to correlate with tissue hypoxia?

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A
Metabolic acidosis
B
Thrombocytopenia
C
Hypokalemia
D
Bilirubinemia
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Question 10
Multiple Choice

A patient is mildly hypoxemic. Which of the following signs would the respiratory therapist expect to find in this patient?

Choose correct answer/s
A
An increase in the patient's breathing rate and heart rate
B
A decrease in systemic blood pressure
C
Cardiac dysrhythmias on an EKG
D
Anemia
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