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Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
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Static autoregulation in humans.

Yufan Wang1, Stephen J Payne2

  • 1Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|November 7, 2023
PubMed
Summary
This summary is machine-generated.

Cerebral autoregulation, which keeps cerebral blood flow (CBF) stable against blood pressure changes, is more effective at buffering high blood pressure. The autoregulation plateau is narrower than previously thought.

Keywords:
Cerebral autoregulationarterial blood pressureautoregulatory curvecerebral blood flowstatic autoregulation

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Area of Science:

  • Neuroscience
  • Physiology
  • Cardiovascular Research

Background:

  • Cerebral autoregulation maintains stable cerebral blood flow (CBF) despite arterial blood pressure (ABP) fluctuations.
  • The traditional view of a wide autoregulation range has been challenged by recent studies.
  • A quantitative understanding of the static cerebral pressure-flow relationship is needed.

Purpose of the Study:

  • To update the understanding of the static cerebral pressure-flow relationship.
  • To rigorously characterize the cerebral autoregulation curve.
  • To quantify the effectiveness of cerebral autoregulation across different ABP levels.

Main Methods:

  • Comprehensive literature research including 143 studies in healthy adults (18-65 years).
  • Analysis of cerebral blood flow (CBF) sensitivity to changes in arterial blood pressure (ABP).
  • Regression analysis to identify the autoregulatory plateau.

Main Results:

  • Mean CBF sensitivity to decreased ABP was 1.47 ± 0.71%/% and to increased ABP was 0.37 ± 0.38%/%.
  • Cerebral autoregulation is more effective in buffering increases in ABP than decreases.
  • An autoregulatory plateau was identified between 80-100 mmHg ABP, a range of approximately 20 mmHg.
  • Age and sex did not significantly affect autoregulation strength.

Conclusions:

  • Cerebral autoregulation exhibits directional sensitivity, being more robust against increases in ABP.
  • The static autoregulation plateau is narrower than traditionally accepted.
  • This data-driven approach offers a quantitative method for analyzing static autoregulation.