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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...
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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...
Primary Motives: Sleep, Sex, and Pain Avoidance01:24

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Primary motives such as sleep, sex, and pain avoidance are crucial drivers of behavior in humans and animals. These motives ensure survival, reproductive success, and overall well-being by prompting actions that meet essential bodily needs.
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Hypertension I: Introduction01:28

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Hypertension is a widespread, long-term medical condition where blood pressure in the arteries remains elevated. It is characterized by systolic blood pressure readings of 130 mm Hg or above or diastolic blood pressure (DBP) readings of 80 mm Hg or higher. Unmanaged hypertension poses significant health risks, making the distinction between primary (or essential) hypertension and secondary hypertension crucial, as their management and implications vary.Primary HypertensionPrimary hypertension,...
Hemorrhagic Stroke l: Introduction01:17

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A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...

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Related Experiment Video

Updated: Jun 23, 2026

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
10:39

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Published on: June 2, 2014

Redefining primary headaches.

V Bonavita1, R De Simone

  • 1Istituto di Diagnosi e Cura Hermitage Capodimonte, Naples, Italy.

Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology
|May 6, 2009
PubMed
Summary
This summary is machine-generated.

Recent pathophysiologic insights allow redefining some primary headaches. Chronic migraine may arise from comorbid conditions, with allodynia potentially driving pain progression in some patients.

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Last Updated: Jun 23, 2026

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Area of Science:

  • Neurology
  • Neuroscience
  • Pain Medicine

Background:

  • Idiopathic and primary headaches lack clear definitions.
  • Cluster headache and trigeminal neuralgia are distinct primary headache disorders.
  • Chronic migraine is debated, potentially linked to comorbid conditions.

Discussion:

  • This study explores redefining primary headaches based on new pathophysiologic knowledge.
  • It proposes chronic migraine as a consequence of mechanisms activated by comorbidities.
  • The role of allodynia in migraine pain progression is examined.

Key Insights:

  • Advancements in pathophysiology enable reclassifying certain headaches.
  • Chronic migraine may be an acquired condition linked to other health issues.
  • Allodynia is investigated as a potential mechanism in migraine progression.

Outlook:

  • Further research into headache pathophysiology can refine classifications.
  • Understanding comorbid influences may lead to novel chronic migraine treatments.
  • Investigating allodynia could reveal new therapeutic targets for migraine.