Key result
CO2 and blood pressure differentially drive macrovascular versus microvascular cerebrovascular reactivity during capnic changes.
Observational
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Cerebrovascular reactivity to CO2 and the relative contributions of CO2 and blood pressure differ between cerebral macro- and microcirculation, highlighting the need to consider compartment-specific regulatory mechanisms.
This study indicates that cerebrovascular reactivity to CO 2 (CVR-CO 2 ) differs between the macro- and microcirculation during both hypocapnia and hypercapnia and that relative contributions of CO 2 and blood pressure to these responses differ between vascular compartments during hypercapnia. These findings highlight the importance of considering compartment-specific regulatory mechanisms when interpreting CVR-CO 2 .
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Kurazumi et al. (2026) conducted an observational in Healthy adults. Hypocapnia and hypercapnia (CO2 and blood pressure variations) vs. Macrocirculation vs microcirculation compartments was evaluated on Cerebrovascular reactivity to CO2 (CVR-CO2). CO2 and blood pressure exhibited differential relative contributions to cerebrovascular reactivity between macro- and microcirculation during hypercapnia and hypocapnia in healthy adults.
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