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Comparisons of the regional intracranial velocities (MCAv vs. PCAv) and extracranial blood flows (QICA vs. QVA), as well as relative velocity and blood flow changes in the proximal intra-cranial vs. extracranial (MCAv vs. QICA; PCAv vs. QVA) vessels during poikilocapnic normoxia and hyperoxia. φP < 0.05, significance between vessels.
