The key to answering this question is given by UWorld as the following chain of reasoning:
Cerebral blood flow (CBF) remains relatively constant over a wide range of perfusion pressures (cerebrovascular autoregulation)
and is mainly influenced by arterial blood gas levels, particularly changes in PaCO. Hypercapnia triggers an increase in CBF (to
aid in removal of toxins), and hypocapnia triggers a decrease in CBF. In fact, because hypocapnia decreases CBF, mechanically
ventilated patients with cerebral edema are often hyperventilated to decrease intracranial pressure and help prevent brain
herniation.
These cards directly address this concept, which is not addressed by any of the other tagged cards for this question.