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Related Concept Videos

Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
Ischemic Heart Disease: Overview01:17

Ischemic Heart Disease: Overview

Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
Atherosclerosis, the primary malefactor, orchestrates this dangerous condition. It manifests as the accumulation of fatty deposits, akin to insidious plaques, within arterial walls. As time elapses, these plaques metamorphose, hardening and narrowing...
Inflammatory Bowel Disease I: Introduction01:26

Inflammatory Bowel Disease I: Introduction

Inflammatory bowel disease is a group of chronic disorders marked by recurrent inflammation of the gastrointestinal tract due to an abnormal immune response against gut microflora. This leads to tissue damage. The two main forms are Crohn’s disease and ulcerative colitis.Crohn’s DiseaseCrohn’s disease is a relapsing inflammatory disorder that can affect any part of the GI tract, from the mouth to the anus. It involves all layers of the bowel wall (transmural) and shows “skip lesions” in which...
Inflammatory Bowel Disease II: Ulcerative Colitis01:20

Inflammatory Bowel Disease II: Ulcerative Colitis

Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
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The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...

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Related Experiment Video

Updated: Jun 4, 2026

Multimodality Diagnosis of Mesenteric Ischemia
05:07

Multimodality Diagnosis of Mesenteric Ischemia

Published on: July 21, 2023

Is "ischemic" colitis ischemic?

Ryan M Carlson, Robert D Madoff

    Diseases of the Colon and Rectum
    |February 10, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Ischemic colitis may not be caused by reduced blood flow as commonly believed. Current evidence suggests many cases are actually acute idiopathic colitis, challenging established medical tenets.

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    Published on: May 18, 2018

    Area of Science:

    • Gastroenterology
    • Colorectal Diseases
    • Vascular Medicine

    Background:

    • Ischemic colitis is often diagnosed when reduced blood flow is suspected.
    • Established understanding suggests specific colonic vulnerabilities and diagnostic markers.

    Purpose of the Study:

    • To re-evaluate the etiological basis of ischemic colitis.
    • To challenge the conventional understanding and diagnostic criteria for ischemic colitis.

    Main Methods:

    • Review of existing literature and clinical data on ischemic colitis.
    • Critical analysis of commonly accepted pathophysiological tenets.

    Main Results:

    • The colon's sensitivity to ischemia is lower than previously thought.
    • Global hypoperfusion is not a common precursor.
    • "Watershed areas" are not disproportionately affected.
    • Colonoscopy with biopsy lacks specificity for diagnosing ischemic colitis.

    Conclusions:

    • Ischemic colitis is likely a heterogeneous condition, not a single entity.
    • Many cases diagnosed as ischemic colitis may be "acute idiopathic colitis" due to unknown causes.