Hyperventilation results in all of the following EXCEPT

Hyperventilation is initiated due to an increase in PCO2. The increased rate of breathing "blows off" excess CO2. Thus, hyperventilation results in a decrease of PCO2 to its normal physiologic range. The increased respiratory rate causes a ↑PO2. The resultant decrease in CO2 causes hypocapnia. The resultant decrease in PCO2 causes vasoconstriction, leading to ↓cerebral blood flow. Respiratory alkalosis occurs due to the ↑pH.