Causes Hypocapnia

hypocapnia induced in treatment of medical emergencies such intracranial hypertension , hyperkalaemia.

self-induced hypocapnia through hyperventilation basis dangerous schoolyard fainting game. deliberate hyperventilation has been used underwater breath-hold divers purpose of extending dive time reduces respiratory drive due low co2 levels allowing 1 break 1 s standard limit of breath holding @ risk of shallow water blackout (which significant cause of drowning) while air hunger reduced oxygen levels not increased, in fact hypocapnia reduces oxygen levels available brain due elevated affinity of oxygen hemoglobin (bohr effect) hence highly increasing chances of blackout.