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Related Concept Videos

Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

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...
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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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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...
Increased Intracranial Pressure l: Introduction01:14

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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 expands, CSF and venous blood...
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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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Comprehensive Endovascular and Open Surgical Management of Cerebral Arteriovenous Malformations
14:58

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Published on: October 20, 2017

Persistent hemodynamic changes in ruptured brain arteriovenous malformations.

Till Illies1, Nils Daniel Forkert, Dennis Saering

  • 1Department of Diagnostic and Interventional Neuroradiology, University Hospital Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany. T.illies@uke.uni-hamburg.de

Stroke
|October 24, 2012
PubMed
Summary
This summary is machine-generated.

Previous brain arteriovenous malformation (AVM) rupture significantly alters blood flow transit times. Hemodynamic properties are not reliable for predicting future AVM hemorrhage risk.

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • Hemodynamic properties of brain arteriovenous malformations (AVMs) linked to hemorrhage risk are largely unknown.
  • Previous studies have not established a clear correlation between AVM anatomical risk factors and hemodynamic characteristics.

Purpose of the Study:

  • To investigate if AVMs with anatomical features associated with increased rupture risk exhibit distinct hemodynamic properties.
  • To determine the relationship between specific AVM characteristics and blood flow transit times.

Main Methods:

  • Seventy-two patients with AVMs underwent time-resolved 3D MR angiography.
  • Relative blood flow transit times were calculated using the time-to-peak parameter from MR angiography data.
  • Multiple regression analysis identified factors associated with altered transit times, including prior hemorrhage, nidus location, and drainage patterns.

Main Results:

  • A prior intracranial hemorrhage was the sole characteristic significantly associated with altered relative transit times (increase of 2.1-2.4 seconds).
  • This association remained significant after adjusting for other regressors and was independent of bleeding age.
  • Other AVM features like nidus size, location, and venous drainage did not significantly impact transit times.

Conclusions:

  • Hemodynamic parameters, as measured by transit times, are not useful for assessing the risk of AVM-related hemorrhage.
  • Only a history of AVM rupture causes a significant and lasting change in hemodynamics.
  • Further research may be needed to identify other reliable predictors of AVM rupture.