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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: Nov 12, 2025

Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression

Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression

Published on: December 10, 2014

Cerebral perfusion pressure and autoregulation in eclampsia-a case control study.

Lina Bergman¹, Catherine Cluver², Niclas Carlberg³

¹Department of Obstetrics and Gynecology, Stellenbosch University, Cape Town, South Africa; Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden; Department of Obstetrics and Gynecology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.

American Journal of Obstetrics and Gynecology

|March 21, 2021

Summary

Dynamic cerebral autoregulation is impaired in eclampsia, with altered cerebral perfusion pressure. These findings suggest potential therapeutic targets for preventing cerebral complications in preeclampsia.

Keywords:

cerebral autoregulation cerebral blood flow cerebral perfusion pressure preeclampsia

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Area of Science:

Obstetrics and Gynecology
Neurology
Critical Care Medicine

Background:

Preeclampsia alters dynamic cerebral autoregulation and cerebral perfusion pressure.
The relationship between these factors and cerebral complications in preeclampsia is not fully understood.

Purpose of the Study:

To evaluate dynamic cerebral autoregulation and cerebral perfusion pressure post-delivery.
To compare these measures in women with eclampsia, preeclampsia (severe and non-severe features), and normotensive controls.

Main Methods:

Prospective case-control study in Cape Town, South Africa.
Transcranial Doppler and continuous noninvasive blood pressure monitoring post-delivery.
Calculation of cerebral perfusion pressure and dynamic cerebral autoregulation index for group comparison.

Main Results:

Dynamic cerebral autoregulation was significantly depressed in women with eclampsia (autoregulation index 3.9) compared to other groups.
Women with eclampsia exhibited increased cerebral perfusion pressure (109.5 mm Hg) compared to those with non-severe preeclampsia and normotensive controls.

Conclusions:

Altered cerebral perfusion pressure and dynamic cerebral autoregulation in eclampsia are significant.
These parameters may play a role in the pathophysiology of preeclampsia and represent potential therapeutic targets for preventing cerebral complications.