In posthyperventilation apnea (PHVA), respirations stop after hyperventilation followed by the return of rhythmic breathing.What stimulus causes the hyperventilation?
A)High arterial carbon dioxide
B)Low arterial oxygen
C)Normal arterial carbon dioxide
D)High arterial oxygen

Question

Quizplus · Accepted Answer

When neural control at this center is lost as consciousness decreases, the lower brainstem centers regulate the breathing pattern by responding only to changes (increases) in PaCO₂ levels. The result is the irregular breathing associated with PHVA.

In Posthyperventilation Apnea (PHVA), Respirations Stop After Hyperventilation Followed by the Return