Podcast
Questions and Answers
What effect does an increase in pH have on the oxygen dissociation curve?
What effect does an increase in pH have on the oxygen dissociation curve?
Which of the following diseases is NOT known to affect the V/Q ratio?
Which of the following diseases is NOT known to affect the V/Q ratio?
In an upright position, where is the V/Q ratio typically higher?
In an upright position, where is the V/Q ratio typically higher?
If a patient's V/Q ratio trend is downward, what can be inferred about the ratio?
If a patient's V/Q ratio trend is downward, what can be inferred about the ratio?
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What is the Respiratory Quotient (RQ) value indicating the relationship between air and blood flow?
What is the Respiratory Quotient (RQ) value indicating the relationship between air and blood flow?
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What is the formula used to calculate the arterial content of oxygen (CaO₂)?
What is the formula used to calculate the arterial content of oxygen (CaO₂)?
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What is the normal value for the difference in arterial and venous oxygen content ((Cla-v)O₂)?
What is the normal value for the difference in arterial and venous oxygen content ((Cla-v)O₂)?
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In a scenario where the alveolar ventilation is 10 LPM and pulmonary blood flow is 12 LPM, what can be inferred about the V/Q ratio?
In a scenario where the alveolar ventilation is 10 LPM and pulmonary blood flow is 12 LPM, what can be inferred about the V/Q ratio?
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What is the normal value for oxygen delivery (DO₂) in mL?
What is the normal value for oxygen delivery (DO₂) in mL?
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When the pH decreases and the oxygen dissociation curve shifts to the right (P50 increase), which of the following is most likely affected?
When the pH decreases and the oxygen dissociation curve shifts to the right (P50 increase), which of the following is most likely affected?
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Study Notes
Example Calculation
- Alveolar ventilation is 10 LPM
- Pulmonary blood flow is 12 LPM
- The V/Q ratio is about?
Ratio Explanation
- RQ = 0.8: for every unit of air reaching alveoli, there's slightly more than 1 unit of blood flow to the capillaries
- When pH ↑, O2 diss curve shifts to the right
- When pH ↓, O2 diss curve shifts to the left
- ↑ P50 ↓
Conditions Causing Hypoxia
- Know conditions that cause 4 Hypoxia Types
Diseases & V/Q Ratio
- Diseases that ↑ V/Q = asthma, PNA, bronchitis
- Which way will CO2 + HCO3 move in relation to pH?
V/Q Ratio and Position
- Ratio is lower in bases (in upright position) due to gravity
- V/Q ratio is higher in apices (upright posture)
- More ventilation relative to perfusion
- If I trend my pt.’s ratio now would be lower
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Description
Test your understanding of pulmonary physiology, specifically the V/Q ratio and its implications in different conditions. This quiz covers alveolar ventilation, blood flow, and factors affecting hypoxia. Determine how various diseases influence the V/Q ratio and explore the relationship between pH and oxygen dissociation.
