Blood-brain barrier dysfunction in intensive care unit.

Area of Science:

• Neuroscience
• Critical Care Medicine
• Vascular Biology

Background:

• The blood-brain barrier (BBB) is a specialized vascular structure protecting the central nervous system.
• BBB dysfunction is a critical indicator of severity in intensive care unit (ICU) diseases.
• Factors like inflammation, critical illness, patient age, and comorbidities contribute to BBB alterations.

Purpose of the Study:

• To review the structural and functional aspects of the BBB.
• To present methods for investigating BBB integrity and permeability.
• To highlight ICU diseases associated with BBB dysfunction.

Main Methods:

• Review of existing literature on BBB structure, function, and dysfunction.
• Description of diagnostic tools and indirect methods for assessing BBB permeability in humans.
• Analysis of clinical relevance in intensive care settings.

Main Results:

• BBB dysfunction increases permeability, allowing passage of solutes, cells, and xenobiotics into the brain.
• Indirect imaging and biochemical methods are crucial for human BBB assessment.
• BBB alterations are implicated in various critical illnesses managed in the ICU.

Conclusions:

• Accurate diagnosis of BBB dysfunction is essential for timely management by intensivists.
• Understanding BBB mechanisms is key to improving outcomes for critically ill patients.
• Further research into BBB probing methods can enhance clinical practice.