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Related Concept Videos

Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

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...
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...
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...
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...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

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...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...

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Related Experiment Video

Updated: May 14, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
10:34

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage

Published on: August 30, 2020

Subarachnoid hemorrhage.

Alejandro A Rabinstein

    Neurology
    |January 30, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Subarachnoid hemorrhage (SAH) from ruptured brain aneurysms is often fatal or causes severe complications. This research explores the long-term outcomes for SAH survivors, an understudied area.

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    Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
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    A Murine Model of Subarachnoid Hemorrhage
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    A Murine Model of Subarachnoid Hemorrhage

    Published on: November 21, 2013

    Related Experiment Videos

    Last Updated: May 14, 2026

    Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
    10:34

    Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage

    Published on: August 30, 2020

    Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
    09:14

    Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model

    Published on: June 18, 2021

    A Murine Model of Subarachnoid Hemorrhage
    07:40

    A Murine Model of Subarachnoid Hemorrhage

    Published on: November 21, 2013

    Area of Science:

    • Neurology
    • Neurosurgery
    • Vascular Neurology

    Background:

    • Subarachnoid hemorrhage (SAH) is a critical neurological condition often caused by ruptured intracranial aneurysms.
    • SAH carries a high immediate mortality rate, with significant risks of rebleeding and severe complications like delayed cerebral ischemia (vasospasm).
    • Current research predominantly focuses on the acute phase of SAH, leaving long-term outcomes for survivors less understood.

    Purpose of the Study:

    • To investigate the long-term health consequences and recovery trajectories for patients who survive the initial phase of subarachnoid hemorrhage.
    • To identify factors influencing long-term morbidity and mortality in SAH survivors.
    • To highlight the need for extended monitoring and management strategies for individuals recovering from SAH.

    Main Methods:

    • Review of existing literature on long-term SAH outcomes.
    • Analysis of patient data focusing on neurological deficits, quality of life, and survival beyond the acute phase.
    • Identification of common long-term complications, including cognitive impairment and secondary vascular events.

    Main Results:

    • Survivors of SAH face a spectrum of long-term challenges, including persistent neurological deficits and reduced quality of life.
    • Delayed cerebral vasospasm remains a significant concern, contributing to secondary strokes even after aneurysm treatment.
    • Limited data exists on the cumulative impact of SAH on long-term patient well-being and functional recovery.

    Conclusions:

    • There is a critical knowledge gap regarding the long-term prognosis and management of subarachnoid hemorrhage survivors.
    • Further research is essential to develop effective strategies for mitigating long-term complications and improving the quality of life for SAH patients.
    • Long-term follow-up care is crucial for addressing the evolving needs of individuals who have experienced SAH.