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Updated: Dec 13, 2025

Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
Published on: January 19, 2020
The influence of intracranial hypertension on static cerebral autoregulation
Marcelo de-Lima-Oliveira1, Almir Andrade Ferreira1, Alessandro Rodrigo Belon2
1Neurology Department, Hospital Das Clinicas Da FMUSP , Sao Paulo, Brazil.
Objectives:
To analyze the influences of mild and severe intracranial hypertension on cerebral autoregulation (CA).
Patients And Methods:
Duroc piglets were monitored with an intracranial pressure (ICP) catheter. Intracranial hypertension was induced via infusion of 4 or 7 ml of saline solution by a bladder catheter that was inserted into the parietal lobe. The static cerebral autoregulation (sCA) index was evaluated via cerebral blood flow velocities (CBFv). Piglets with ICPs ≤ 25 and > 25 mmHg were considered as group 1 and 2, respectively. Continuous variables were evaluated using the Kolmogorov-Smirnov goodness-of-fit test. The main parameters were collected before and after ICH induction and compared using two-factor mixed-design ANOVAs with the factor of experimental group (mild and severe ICH).
Results:
In group 1 (ICP ≤ 25 mmHg), there were significant differences in sCA (p = .01) and ICP (p = .0002) between the basal and balloon inflation conditions. In group 2 (ICP > 25 mmHg), there were significant differences in CBFv (p = .0072), the sCA index (p = .0001) and ICP (p = .00001) between the basal and balloon inflation conditions.
Conclusion:
We conclude that intracranial hypertension may have a direct effect on sCA.
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