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Autoregulation of Blood Flow

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.

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Related Experiment Video

Updated: Jun 26, 2026

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry

Published on: January 19, 2020

Autoregulative function in the brain in an endotoxic rat shock model.

B Rosengarten¹, M Hecht, S Wolff

¹Department of Neurology, University Hospital Giessen and Marburg, Am Steg 14, 35392, Giessen, Germany. bernhard.rosengarten@neuro.med.uni-giessen.de

Inflammation Research : Official Journal of the European Histamine Research Society ... [Et Al.]

|December 26, 2008

Summary

Lipopolysaccharide (LPS)-induced shock impairs brain autoregulation in rats. High LPS doses led to vasoregulative failure, indicating compromised cerebral blood flow control during endotoxic shock.

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Area of Science:

Neuroscience
Physiology
Pharmacology

Background:

Autoregulative function in the brain is critical during hypodynamic conditions like sepsis syndrome.
Lipopolysaccharide (LPS) from E. coli is a common endotoxin used to induce shock models.
Understanding the impact of LPS on cerebral autoregulation is vital for managing sepsis.

Purpose of the Study:

To investigate the temporal pattern of LPS-induced shock on brain autoregulation.
To determine the dose-dependent effects of LPS on autoregulative function in rats.
To assess the impact of endotoxic shock on cerebral blood flow control.

Main Methods:

Male CD-rats (n=30) were anesthetized and mechanically ventilated.
Animals received intravenous vehicle, 1 mg/kg, or 5 mg/kg LPS.
Cerebral autoregulation was assessed using carotid compression and laser Doppler flowmetry to measure the transient hyperemic response ratio (THRR).

Main Results:

Despite reduced blood pressure in LPS groups, progressive cerebral hyperemia was observed.
Autoregulatory compensation for lower blood pressure was significantly impaired in the high LPS dose group.
Compared to exsanguination controls, cerebral autoregulation showed failure at the end of experiments in the high LPS dose group.

Conclusions:

LPS-induced shock significantly affects cerebral autoregulation.
The findings support the concept of vasoregulative failure in endotoxic shock.
Impaired cerebral blood flow control is a key consequence of severe sepsis.