Ventilation-Perfusion Knowledge Quiz
Test your understanding of ventilation-perfusion concepts and clinical applications.
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What does the ventilation-perfusion (V/Q) ratio primarily describe?
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The relationship between alveolar ventilation and pulmonary capillary blood flow
The amount of oxygen dissolved in plasma
The difference between arterial and venous CO2
The rate of oxygen utilization by tissues
Which of the following conditions typically results in a low V/Q ratio?
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Asthma
Pulmonary embolism
Emphysema
Pulmonary fibrosis
Select all factors that can affect the V/Q ratio in the lungs.
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Gravity
Body position
Airway obstruction
Cardiac output
Other
Match the following V/Q abnormalities with their most likely clinical causes.
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Rows
Clinical Cause
V/Q = 0
Pulmonary embolism
Airway obstruction
Normal lung
Chronic bronchitis
V/Q = ∞
Pulmonary embolism
Airway obstruction
Normal lung
Chronic bronchitis
V/Q = 1
Pulmonary embolism
Airway obstruction
Normal lung
Chronic bronchitis
Low V/Q
Pulmonary embolism
Airway obstruction
Normal lung
Chronic bronchitis
The V/Q ratio is highest at which region of the upright lung?
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Apex
Base
Middle zone
There is no difference
Which of the following statements about dead space is correct?
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It refers to areas with ventilation but no perfusion
It is increased in pneumonia
It is the same as shunt
It is decreased in pulmonary embolism
A patient has a shunt. What is the expected V/Q ratio in the affected area?
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0
1
Infinity
Cannot be determined
On a ventilation-perfusion scan, what pattern is most suggestive of a pulmonary embolism?
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Normal ventilation, decreased perfusion
Decreased ventilation, normal perfusion
Both ventilation and perfusion decreased
Both ventilation and perfusion normal
Briefly explain why V/Q mismatch can lead to hypoxemia.
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How confident are you in your understanding of ventilation-perfusion concepts?
Not confident
1
2
3
4
Very confident
5
1 is Not confident, 5 is Very confident
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