hyperventilation with poor gas exchange
normal:
This is a situation caused by parenchymal lung disease in which there is a poor gas exchange. The overactive stimulation to breathe comes not from the PaCO2, which is low, but is probably a result of stimulation of J receptors in the lung - i.e. it is a neurogenic phenomenon.
A similar picture develops in asthma, this time in an airways disease as a result of stimulation of irritant receptors.
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