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Related Concept Videos

Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

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Brain metabolism during a decrease in cerebral perfusion pressure caused by an elevated intracranial pressure in the

Norbert Zoremba1, Joerg Schnoor, Michael Berens

  • 1Department of Anesthesiology, University Hospital RWTH Aachen, Aachen, Germany. nzoremba@ukaachen.de

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Elevated intracranial pressure (ICP) increases lactate and glycerol levels. Cerebral perfusion pressure (CPP) below 40 mm Hg with high ICP indicates potential brain damage.

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Area of Science:

  • Neuroscience
  • Physiology
  • Metabolomics

Background:

  • Cranial hypertension is linked to reduced cerebral blood flow and oxygen delivery, impacting patient outcomes.
  • Understanding metabolic changes during increased intracranial pressure (ICP) is crucial for identifying damage thresholds.

Purpose of the Study:

  • To monitor energy-related metabolites in the porcine cortex during induced increases in ICP.
  • To determine the critical levels of ICP and cerebral perfusion pressure (CPP) associated with neuronal damage.

Main Methods:

  • Male domestic pigs underwent anesthesia and mechanical ventilation.
  • Microdialysis was used to measure cortical extracellular concentrations of lactate, pyruvate, glucose, glutamate, and glycerol.
  • ICP was incrementally increased by 10 mm Hg hourly via cerebrospinal fluid infusion up to 50 mm Hg.

Main Results:

  • Significant increases in lactate and glycerol were observed at ICP ≥30 mm Hg and CPP <50 mm Hg.
  • Higher ICP (≥40 mm Hg) combined with lower CPP (<40 mm Hg) resulted in increased lactate/pyruvate ratio, elevated glutamate, and decreased glucose.
  • These metabolic shifts indicate significant cellular stress and potential damage.

Conclusions:

  • Lower CPP values may be tolerated during ICP elevation until severe damage occurs.
  • Borderline ICP and CPP values of 30 mm Hg and 40 mm Hg, respectively, may represent critical thresholds.
  • These findings aid in understanding the physiological response to elevated ICP and guiding clinical management.