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This is a 15 MCQ quiz on blood gases. We suggest reviewing the Blood gas analysis and Acid-base disorders pages before taking this quiz.
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                        Question 1 of 15
1. Question
Which of the following is the alveolar gas equation
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                        Question 2 of 15
2. Question
The inspired partial pressure of oxygen is all of the following except
Correct
The effect of atmospheric humidity has no significant effect on the alveolar pO2 as the inspired gas is humidified by the mucosa of the upper airway.(link)
Incorrect
The effect of atmospheric humidity has no significant effect on the alveolar pO2 as the inspired gas is humidified by the mucosa of the upper airway.(link)
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                        Question 3 of 15
3. Question
The partial pressure of water vapour at sea level is
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                        Question 4 of 15
4. Question
An increase in the respiratory quotient is most likely to
Correct
A high respiratory quotient reduces the amount of CO2 produced from the same amount of O2 consumed so an increase in the respiratory quotient should increase the alveolar partial pressure of O2. (link)
Incorrect
A high respiratory quotient reduces the amount of CO2 produced from the same amount of O2 consumed so an increase in the respiratory quotient should increase the alveolar partial pressure of O2. (link)
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                        Question 5 of 15
5. Question
Which of the following statements best describes the effect of increasing VQ mismatch (pulmonary shunting)
Correct
The PaO2 falls progressively as shunt fraction increases, but the PaCO2 remains constant until the shunt fraction exceeds 50%.
Incorrect
The PaO2 falls progressively as shunt fraction increases, but the PaCO2 remains constant until the shunt fraction exceeds 50%.
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                        Question 6 of 15
6. Question
The normal range of the alveolar-arterial gradient in the erect patient is
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                        Question 7 of 15
7. Question
For every 0.01 increase in FiO2 at STP, the normal alveolar partial pressure of O2 increases by approximately
Correct
The alveolar partial pressure of O2 increases by approximately 6 mmHg for every 0.01 increase in FiO2 which is less than the approximately 7 mmHg expected. This is due to pulmonary vasoconstriction caused by the increased inspired oxygen partial pressure. (link)
Incorrect
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                        Question 8 of 15
8. Question
The respiratory quotient (R) will be highest in the following circumstance
Correct
Carbohydrates have an R value of 1, Protein 0.8, Fat 0.7 and alcohol of 0.6. There is no specific diurnal variation in R, however it does depend on the timing and content of the last meal. If anything, fasting overnight is likely to result in a low value of R.(link)
Incorrect
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                        Question 9 of 15
9. Question
In the presence of a simple metabolic acidosis of >24 hours duration the lower limit of compensation of PCO2 is usually
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                        Question 10 of 15
10. Question
In the presence of a simple metabolic alkalosis of >24 hours duration the upper limit of compensation of PCO2 is usually
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                        Question 11 of 15
11. Question
In the presence of a simple respiratory acidosis, for every 10 mmHg increase in PCO2 the HCO3 would be expected to increase within 10 minutes by
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                        Question 12 of 15
12. Question
In the presence of a simple respiratory acidosis, every 10 mmHg increase in PCO2 would be expected to increase the HCO3 at 4 days by approximately
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                        Question 13 of 15
13. Question
In the presence of a simple respiratory alkalosis, each 10 mmHg decrease in PCO2 would be expected to decrease HCO3 within 10 minutes by approximately
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                        Question 14 of 15
14. Question
In the presence of a simple respiratory alkalosis, each 10 mmHg decrease in PCO2 would be expected to decrease HCO3 at 4 days by approximately
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                        Question 15 of 15
15. Question
The HCO3 usually compensates for a chronic respiratory acidosis to a maximum concentration of