During hemorrhage-induced hypotension in rabbits, diastolic flow velocity decreases at a higher mean arterial pressure than systolic flow velocity and cortical flux, reflecting cerebral resistive vessel dilation.
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Animal data indicate diastolic cerebral flow velocity declines earlier in hypotension; leaves open translation of autoregulatory thresholds to human practice.
Czosnyka et al. (1994) studied this question.
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