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CO 2 Reactivity in Brain Relies on Blood Pressure Regulation as Well as Arteriolar Vaso-Reactivity

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Observational analysis shows hyperventilation decreases MCAv while CO2 retention increases it, indicating the role of blood pressure regulation.

Hyperventilation reduces middle cerebral artery blood velocity (MCAv) by causing arteriolar vasoconstriction.
Carbon dioxide retention increases MCAv alongside a rise in blood pressure, complicating the relationship between the two.
Analysis of MCAv and blood pressure was conducted in 14 healthy volunteers, providing insights into cerebrovascular responses.
These findings highlight the interplay between blood pressure regulation and CO2 reactivity in brain health.

Chan et al. (2025) studied this question.

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Observational analysis shows hyperventilation decreases MCAv while CO2 retention increases it, indicating the role of blood pressure regulation.