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Related Concept Videos

Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

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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...
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Increased Intracranial Pressure ll: Pathophysiology01:29

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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...
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Cerebrospinal Fluid01:21

Cerebrospinal Fluid

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Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
CSF Production
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Cerebral Edema ll: Pathophysiology01:22

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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...
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Cerebral Edema l: Introduction01:19

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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...
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There are hollow fluid-filled cavities known as ventricles deep inside the human brain. There are two lateral ventricles, one in each cerebral hemisphere, and each has three different projections — the anterior, inferior, and posterior horns visible from the lateral side. A thin membrane called the septum pellucidum separates the two lateral ventricles. The slender third ventricle in the diencephalon is connected to each lateral ventricle via a channel called the interventricular foramen.
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IIH with normal CSF pressures?

Soh Youn Suh, Seong-Joon Kim1

  • 1Department of Ophthalmology, Seoul Artificial Eye Center, Seoul National University Hospital Clinical Research Institute, Seoul National University College of Medicine, Seoul, Korea.

Indian Journal of Ophthalmology
|October 23, 2013
PubMed
Summary
This summary is machine-generated.

Idiopathic intracranial hypertension (IIH) may occur with normal cerebrospinal fluid pressure. Early acetazolamide treatment can resolve symptoms like papilledema and headaches, preventing vision loss.

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Area of Science:

  • Neurology
  • Ophthalmology

Background:

  • Idiopathic intracranial hypertension (IIH) is characterized by elevated intracranial pressure (ICP) without a detectable cause.
  • Diagnosis typically relies on lumbar puncture revealing cerebrospinal fluid (CSF) pressure above 250 mm H2O.

Observation:

  • Two patients presented with headaches and disc swelling, indicative of papilledema.
  • These patients did not exhibit elevated ICP upon lumbar puncture.

Findings:

  • Both patients received acetazolamide treatment due to IIH-related symptoms and papilledema.
  • Acetazolamide effectively resolved the headaches and disc swelling in both cases.

Implications:

  • These cases suggest IIH may be present even with normal CSF pressure.
  • Prompt diagnosis and treatment of papilledema, even without confirmed high ICP, are crucial to prevent irreversible visual loss.