- Normal V (ventilation) is 4 L of air per
- Normal Q (perfusion) is 5L of blood per
- So Normal V/Q ratio is 4/5 or 0.8.
- When the V/Q is higher than 0.8, it means
ventilation exceeds perfusion.
- When the V/Q is < 0.8, there is a VQ
mismatch caused by poor ventilation.
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