When the V/Q is > 0.8, it means ventilation exceeds perfusion. Things that may cause this are a blood clot, heart failure, emphysema, or damage to the pulmonary capillaries. Therefore the Normal V/Q ratio is 4/5 or 0.8. Disruptions of V and Q are how pulmonary embolisms, pneumonia, and other lung pathologies kill patients.Ī normal V (alveolar ventilation)value is around 4 L/minute.Ī normal Q (perfusion)value is around 5 L /minute. This means that some of the blood in the bottom of the lung is not oxygenated and some of the air in the top of the lung does not have its oxygen extracted. This concept is critical. There is more air in the top of the lung, and there is more blood in the bottom of the lung (because of gravity). The diagram to the right can be simplified as follows. This is due to two main reasons: gravity and air. In the normal lung, the V and the Q are not equal, the normal ratio is about 0.8. Q = the amount of blood that reaches the alveoli through the capillary beds V = the amount of air that reaches the alveoli through the alveolar duct In respiratory physiology, the V/Q ratio refers to the ratio of ventilation to perfusion.
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