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A, representative arterial pressure (ABP) and cerebral blood flow velocity (CBFV) waveforms from a subject at baseline and during phenylephrine infusion. B, group averaged mean blood pressure (MBP), CBFV and cerebrovascular resistance index (CVRI) from 13 subjects. The error bars are standard errors of the mean (s.e.m.). *P < 0.05 from baseline.
