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Related Concept Videos

Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

30
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...
30
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

39
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...
39

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Related Experiment Video

Updated: May 5, 2026

Minimally Invasive Thumb-sized Pterional Craniotomy for Surgical Clip Ligation of Unruptured Anterior Circulation Aneurysms
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Extra-intracranial bypass.

J Dostál, V Přibáň, J Mraček

    Rozhledy V Chirurgii : Mesicnik Ceskoslovenske Chirurgicke Spolecnosti
    |July 15, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Extra-intracranial bypass surgery is a vital neurosurgical treatment for cerebrovascular diseases like moyamoya disease and carotid artery occlusion. Careful patient selection and precise microsurgery are key to successful outcomes in high-risk individuals.

    Keywords:
    carotid occlusionextra-intracranial bypassmoyamoyarevascularizationstroke

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    Area of Science:

    • Neurosurgery
    • Vascular Surgery
    • Cerebrovascular Medicine

    Background:

    • Extra-intracranial bypass is a debated but significant neurosurgical intervention for cerebrovascular diseases.
    • Historical data on bypass efficacy are mixed, limiting its application.
    • Modern advancements in diagnostics and surgical techniques are reviving interest in selective bypass procedures.

    Purpose of the Study:

    • To review the indications and effectiveness of extra-intracranial bypass in managing cerebrovascular diseases.
    • To highlight the role of bypass in specific conditions like moyamoya disease and internal carotid artery occlusion.
    • To emphasize the importance of patient selection and surgical technique in optimizing bypass outcomes.

    Main Methods:

    • Review of current literature and clinical practices regarding extra-intracranial bypass.
    • Analysis of indications including moyamoya disease, atherosclerotic disease, acute ischemic stroke, aneurysms, and tumors.
    • Discussion of diagnostic criteria and patient evaluation for bypass candidacy.

    Main Results:

    • Bypass is a proven stroke prevention method for moyamoya disease.
    • It offers a potential treatment for symptomatic internal carotid artery occlusion with exhausted cerebrovascular reserve.
    • Emergent bypass is considered for select acute ischemic stroke patients when standard treatments fail.

    Conclusions:

    • Extra-intracranial bypass remains an essential, albeit debated, component of cerebrovascular surgery.
    • Successful outcomes depend critically on meticulous patient selection and precise microsurgical execution.
    • Modern techniques improve safety and efficacy, offering hope for patients with limited options.