Hyperventilation decrease PaCO2. Central chemoreceptors respond to low PaCO2 by vasoconstricting cerebral blood vessels.
A) Arterial Blood Oxygen Concentration: Blood Oxygen Concentration is directly related to Hb concentration and saturation (SaO2) FA2019, p. 653. Via the Bohr Effect, decreased PaCO2 will increase SaO2, thus increasing blood oxygen concentration.
B) Arterial Blood PO2: PaO2 changes in response to decreased PAO2, PIO2, or diffusion. There would be no change in PaO2 during hyperventilation (theoretically).
C) Aterial Pressure: Decreased PaCO2 is associated with vasoconstriction, which would increase blood pressure.
E) Cerebral Tissue pH would increase due to respiratory alkalosis.
Vasovagal Syncope. Much easier