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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...
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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Related Experiment Video

Updated: May 10, 2026

Controlled Cortical Impact Model for Traumatic Brain Injury
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Cerebral Autoregulation, Mannitol Response, and Outcomes in Traumatic Brain Injury: A Structural Causal Model

Min-Kyung Jung1, Jae-Wook Heo1, Hakseung Kim1

  • 1Department of Brain and Cognitive Engineering, Korea University, Seoul, South Korea.

Neurosurgery
|March 13, 2026
PubMed
Summary

Mannitol effectively reduces intracranial pressure (ICP) in traumatic brain injury patients with low cerebrovascular pressure reactivity (PRx). This study developed a model to predict patient outcomes and personalize mannitol treatment for better results.

Keywords:
Cerebral autoregulationHeterogeneous treatment effectIntracranial pressureMannitol responseStructural causal modelTraumatic brain injury

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Area of Science:

  • Neuroscience
  • Intensive Care Medicine
  • Pharmacology

Background:

  • Intravenous mannitol is used to reduce intracranial pressure (ICP) in traumatic brain injury (TBI).
  • Conditions favoring mannitol response and its prognostic impact are not well understood.
  • Developing models to understand mannitol's causal effects is crucial for TBI management.

Purpose of the Study:

  • To develop a structural causal model (SCMMannitol) for estimating heterogeneous treatment effects of mannitol.
  • To reveal causal relationships between patient status, mannitol response, and prognosis in TBI.
  • To identify factors influencing mannitol's efficacy and patient outcomes.

Main Methods:

  • Collected arterial blood pressure and ICP data from 53 TBI patients receiving 20% mannitol.
  • Derived cerebrovascular pressure reactivity (PRx) and mannitol resistance (RMannitol).
  • Analyzed causal relationships using Structural Causal Models (SCM), incorporating PRx, RMannitol, and Glasgow Outcome Scale-Extended (GOSE).

Main Results:

  • Mannitol significantly reduced ICP when pretreatment PRx was <0.2.
  • Lower RMannitol was observed with PRx <0.2, and RMannitol negatively correlated with GOSE.
  • SCMMannitol identified a causal pathway from PRx to RMannitol to outcomes, enabling personalized treatment effect estimation.

Conclusions:

  • Causality suggests compensatory cerebral vasoconstriction influences mannitol response.
  • The inverse relationship between RMannitol and GOSE highlights the need for ICP monitoring and timely escalation.
  • Integrating PRx and RMannitol in models like SCMMannitol can advance precision medicine for TBI patients.