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Related Concept Videos

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...
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...
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous supply...
Diabetes Insipidus I: Introduction01:29

Diabetes Insipidus I: Introduction

Definition Diabetes insipidus is a disorder marked by the production of large amounts of dilute urine because of impaired vasopressin production, release, or kidney response. The lack of effective vasopressin action limits water reabsorption in the renal collecting ducts, which leads to excessive urinary water loss and intense thirst.Clinical PresentationIndividuals with diabetes insipidus report persistent thirst and very high urine output. In severe cases, fluid intake can reach up to 20...

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Updated: Jul 8, 2026

Modeling Posthemorrhagic Hydrocephalus of Prematurity in Rats
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Published on: March 28, 2025

[Idiopathic normal pressure hydrocephalus].

Etsuro Mori1

  • 1Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku University Graduate School of Medicine.

Rinsho Shinkeigaku = Clinical Neurology
|January 24, 2008
PubMed
Summary

Idiopathic normal pressure hydrocephalus (iNPH) diagnosis in the elderly is challenging. The SINPHONI study validated MRI criteria and shunt treatment for improved outcomes in iNPH patients.

Area of Science:

  • Neurology
  • Neurosurgery
  • Geriatrics

Context:

  • Idiopathic normal pressure hydrocephalus (iNPH) presents diagnostic challenges in elderly patients.
  • Misdiagnosis as Alzheimer's disease or vascular dementia is common, delaying curable treatment.
  • Accurate iNPH recognition is crucial for timely and appropriate patient management.

Purpose:

  • To discuss key clinical and neuroimaging features differentiating iNPH from other dementias.
  • To review the findings of the prospective cohort study of iNPH (SINPHONI).
  • To validate MRI-based diagnostic criteria and ventriculoperitoneal shunt treatment efficacy in iNPH.

Summary:

  • The SINPHONI study validated MRI findings (ventricular enlargement, narrow dorsal subarachnoid space) for iNPH diagnosis.

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Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus
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Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus

Published on: October 14, 2022

Related Experiment Videos

Last Updated: Jul 8, 2026

Modeling Posthemorrhagic Hydrocephalus of Prematurity in Rats
04:12

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Published on: March 28, 2025

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus
14:59

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus

Published on: October 14, 2022

  • The study assessed the effectiveness of ventriculoperitoneal shunting using a programmable valve system.
  • Outcomes were evaluated one year post-surgery, confirming the utility of the diagnostic and treatment approach.
  • Impact:

    • Improved diagnostic accuracy for iNPH, reducing misdiagnosis rates.
    • Enhanced treatment strategies for iNPH, leading to better patient outcomes.
    • Provides evidence-based guidelines for managing iNPH in the elderly population.