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Related Concept Videos

Human Genetics01:28

Human Genetics

Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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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 with...
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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...
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 barrier loses...

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Normal-pressure hydrocephalus: is there a genetic predisposition?

M D Cusimano1, D Rewilak, D T Stuss

  • 1Department of Surgery, Division of Neurosurgery, St. Michael's Hospital, and Department of Surgery, University of Toronto, Toronto, Ontario, Canada.

The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
|February 16, 2011
PubMed
Summary
This summary is machine-generated.

This study on normal-pressure hydrocephalus (NPH) in sisters suggests a genetic link. Further research into genetics and environmental factors is needed to understand NPH development.

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Area of Science:

  • Neurology
  • Genetics
  • Epidemiology

Background:

  • Normal-pressure hydrocephalus (NPH) presents with gait disturbance, cognitive impairment, and normal cerebrospinal fluid pressure.
  • NPH diagnosis involves enlarged ventricles, potentially with cerebral atrophy.

Observation:

  • Two sisters with NPH, living together, exhibited similar disease progression and shared homozygous apolipoprotein E (ApoE) e3 alleles.
  • Both patients responded to shunt placement but experienced delayed deterioration due to vasculopathy.

Findings:

  • The shared ApoE e3 genotype in the sisters suggests a potential genetic predisposition for NPH.
  • No specific environmental factors were identified as contributors to NPH development in this case.

Implications:

  • This case highlights the importance of genetic factors in NPH pathogenesis.
  • Further investigation into gene-environment interactions is crucial for understanding and managing NPH.