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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...
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...
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...
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
Stroke: Introduction and Types01:29

Stroke: Introduction and Types

A stroke is an acute neurological event caused by the sudden disruption of cerebral blood flow, leading to rapid loss of neuronal function. Neurons depend on continuous oxygen and glucose supply, so even brief interruptions can cause irreversible injury within minutes. Strokes are classified into ischemic and hemorrhagic types.Ischemic StrokeIschemic strokes are most common and occur due to arterial occlusion, depriving brain tissue of oxygen and nutrients. This leads to energy failure, ionic...

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Related Experiment Video

Updated: Jul 3, 2026

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

Gastrointestinal bleeding after acute ischemic stroke.

M J O'Donnell1, M K Kapral, J Fang

  • 1Henderson Research Centre, 70 Wing, Room 220, 711 Concession Street, Hamilton, Ontario, L8V 1C3, Canada. odonnm@mcmaster.ca

Neurology
|August 8, 2008
PubMed
Summary
This summary is machine-generated.

Gastrointestinal bleeding after acute ischemic stroke is uncommon but significantly increases the risk of death or severe dependence. This study identified key predictors and outcomes for gastrointestinal hemorrhage in stroke patients.

Related Experiment Videos

Last Updated: Jul 3, 2026

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

Area of Science:

  • Neurology
  • Gastroenterology
  • Clinical Outcomes Research

Background:

  • Major bleeding increases mortality after acute coronary syndrome.
  • Gastrointestinal bleeding is common after ischemic stroke, but its clinical impact is uncertain.

Purpose of the Study:

  • To describe the incidence, risk factors, and clinical outcomes of gastrointestinal bleeding following acute ischemic stroke.

Main Methods:

  • A registry of 6,853 acute ischemic stroke patients from 11 Ontario hospitals (2003-2006) was analyzed.
  • Stroke severity and patient dependence were assessed using validated scales.
  • Multivariable logistic regression identified predictors and outcomes of gastrointestinal bleeding.

Main Results:

  • Gastrointestinal hemorrhage occurred in 1.5% of patients, with 0.5% requiring transfusion.
  • Predictors included a history of peptic ulcer disease, cancer, and stroke severity.
  • Gastrointestinal bleeding independently predicted death or severe dependence at discharge and 6-month mortality.

Conclusions:

  • Gastrointestinal hemorrhage is infrequent but significantly associated with adverse outcomes after acute ischemic stroke.