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Updated: Sep 21, 2025

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
Published on: January 19, 2020
Point/counterpoint: We should take the direction of blood pressure change into consideration for dynamic cerebral
Lawrence Labrecque1,2, Jonathan D Smirl3,4,5,6,7,8,9,10, Yu-Chieh Tzeng11
1Department of Kinesiology, Faculty of Medicine, Université Laval, Québec, Canada.
Abstract:
Accumulating evidence suggests asymmetrical responses of cerebral blood flow during large transient changes in mean arterial pressure. Specifically, the augmentation in cerebral blood flow is attenuated when mean arterial pressure acutely increases, compared with declines in cerebral blood flow when mean arterial pressure acutely decreases. However, common analytical tools to quantify dynamic cerebral autoregulation assume autoregulatory responses to be symmetric, which does not seem to be the case. Herein, we provide the rationale supporting the notion we need to consider the directional sensitivity of large and transient mean arterial pressure changes when characterizing dynamic cerebral autoregulation.
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