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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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A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
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...
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Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
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Dural Stimulation and Periorbital von Frey Testing in Mice As a Preclinical Model of Headache
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Space headache: a new secondary headache.

A A Vein1, H Koppen, J Haan

  • 1Department of Neurology, Leiden University Medical Centre, Leiden, the Netherlands. a.a.vein@lumc.nl

Cephalalgia : an International Journal of Headache
|January 30, 2009
PubMed
Summary

Astronauts frequently experience headaches in space, often unrelated to space motion sickness. This study suggests space-induced headaches may warrant classification as a distinct medical condition.

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Area of Science:

  • Space Medicine
  • Neurology
  • Human Physiology

Background:

  • Headaches are an underreported issue during space missions.
  • Existing research often attributes space headaches to space motion sickness (SMS).

Purpose of the Study:

  • To investigate the prevalence and characteristics of headaches experienced by astronauts during spaceflight.
  • To differentiate space-induced headaches from space motion sickness (SMS).

Main Methods:

  • A survey using criteria from the International Classification of Headache Disorders (ICHD-II) was administered to astronauts.
  • 17 astronauts (16 male, 1 female) participated in the study.

Main Results:

  • 71% of astronauts reported experiencing headaches in space, with 76% not associated with SMS symptoms.
  • Headaches were moderate to severe in 71% of cases.
  • Specific headache types identified included migraine (12%) and tension-type (18%), with 70% classified as non-specific.

Conclusions:

  • Spaceflight can trigger headaches independently of SMS in healthy astronauts.
  • Space-induced headaches may represent a distinct entity among secondary headaches related to homeostasis disruption.