Why and how to assess cerebral autoregulation?

Area of Science:

• Neuroscience
• Physiology
• Critical Care Medicine

Background:

• Cerebral blood flow (CBF) regulation is complex and not fully understood.
• Cerebral autoregulation, the mechanism maintaining stable CBF despite blood pressure fluctuations, exhibits significant inter- and intra-patient variability.
• The traditional approach of using a standard blood pressure target to ensure adequate CBF is insufficient due to this variability.

Purpose of the Study:

• To highlight the complexity of cerebral autoregulation.
• To advocate for individualized blood pressure management in perioperative care.
• To discuss the potential of integrating cerebral autoregulation monitoring into clinical practice.

Main Methods:

• Review of current understanding of cerebral blood flow regulation.
• Discussion of the limitations of existing methods for assessing cerebral autoregulation.
• Analysis of the implications of variable autoregulation for patient management.

Main Results:

• Cerebral autoregulation is highly variable and unpredictable.
• A fixed blood pressure strategy is inadequate for safeguarding cerebral circulation.
• Cerebral autoregulation monitoring offers a pathway to personalized blood pressure management.

Conclusions:

• The dogma of empirically chosen blood pressure must be abandoned.
• Individualized blood pressure management guided by autoregulation monitoring is essential.
• Further development and standardization of cerebral autoregulation assessment methods are needed.