Blood pressure regulation IX: cerebral autoregulation under blood pressure challenges

Area of Science:

• Neurology
• Physiology
• Vascular Biology

Background:

• Cerebral autoregulation (CA) is crucial for stable cerebral perfusion and brain oxygenation.
• Understanding CA's role in cerebrovascular diseases like stroke has advanced, but clinical translation remains limited.
• Existing paradigms and quantification methods for CA are based on outdated constructs and persistent knowledge gaps.

Purpose of the Study:

• To re-evaluate studies challenging established concepts of cerebral perfusion pressure and blood flow regulation.
• To critically assess the physiological properties and quantification methods of cerebral autoregulation.
• To emphasize the need for a comprehensive approach to evaluating CA, considering vasomotor function and intracranial properties.

Main Methods:

• Systematic review and re-evaluation of existing literature on cerebral autoregulation.
• Analysis of studies investigating the relationship between blood pressure and cerebral blood flow.
• Critique of current methodologies used for characterizing CA.

Main Results:

• The precise physiological properties of CA remain inconclusive.
• Many current methods for CA characterization rely on simplistic assumptions, potentially leading to misinterpretations.
• Effective CA evaluation necessitates consideration of active vasomotor function and intracranial environment characteristics.

Conclusions:

• Established paradigms regarding cerebral perfusion pressure and blood flow require re-evaluation.
• Current methods for quantifying CA are insufficient and can yield misleading results.
• A more robust evaluation of CA is needed, integrating active vasomotor function and intracranial factors for improved clinical application.