What's the pulmonary ventilation blood flow ratio?

The pulmonary ventilation flow ratio is generally 0.84. The

pulmonary ventilation flow ratio is the ratio of alveolar ventilation per minute to pulmonary blood flow per minute. If the ratio is higher or lower than 0.84, it will hinder the exchange of effective gases and lead to lack of oxygen and carbon dioxide in the blood. If the ratio is lower than 0.84, it may be caused by chronic bronchitis, obstructive emphysema, pulmonary edema, etc. If the ratio is higher than 0.84, it is generally caused by pulmonary artery infarction, right heart failure, etc. If the ratio is 0, it means atelectasis, alveolar ventilation has stopped, and capillary blood has not been exposed to oxygen, allowing venous blood to flow into the left heart and enter the systemic circulation.