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Related Concept Videos

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue, improving...
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.
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 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...
Regulation of Stroke Volume01:27

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...

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Related Experiment Video

Updated: Jul 2, 2026

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia
06:01

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia

Published on: August 18, 2015

Oxygen therapy in stroke: past, present, and future.

Aneesh B Singhal1

  • 1Massachusetts General Hospital, Stroke Research Center, 175 Cambridge Street, Suite 300, Boston, MA 02114, USA. asinghal@partners.org

International Journal of Stroke : Official Journal of the International Stroke Society
|August 19, 2008
PubMed
Summary

Oxygen therapy for ischemic stroke is debated. Emerging research suggests hyperbaric and normobaric oxygen may be effective, potentially extending the treatment window for thrombolysis in stroke patients.

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Optimized Management of Endovascular Treatment for Acute Ischemic Stroke
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Optimized Management of Endovascular Treatment for Acute Ischemic Stroke

Published on: January 18, 2018

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Last Updated: Jul 2, 2026

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia
06:01

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia

Published on: August 18, 2015

Optimized Management of Endovascular Treatment for Acute Ischemic Stroke
09:21

Optimized Management of Endovascular Treatment for Acute Ischemic Stroke

Published on: January 18, 2018

Area of Science:

  • Neurology
  • Critical Care Medicine
  • Biomedical Research

Background:

  • Oxygen is commonly given to stroke patients, but its use in ischemic stroke is controversial.
  • Previous hyperbaric oxygen therapy trials failed to demonstrate efficacy, raising concerns about free radical injury.
  • Earlier studies lacked robust preclinical data and were based on anecdotal reports.

Purpose of the Study:

  • To review the history, rationale, and mechanisms of hyperoxia in stroke treatment.
  • To analyze the adverse effects and key results of previous hyperoxia studies.
  • To explore the potential role of oxygen therapy in modern stroke management.

Main Methods:

  • Review of historical data and preclinical studies on oxygen therapy in stroke.
  • Analysis of clinical trial outcomes for hyperbaric and normobaric oxygen in stroke.
  • Examination of the physiological mechanisms and potential risks of hyperoxia.

Main Results:

  • Emerging data indicates hyperbaric and normobaric oxygen can be effective when administered appropriately.
  • Hyperoxia presents a potential strategy to broaden the therapeutic time window for stroke thrombolysis.
  • Despite past failures, recent research suggests a refined role for oxygen therapy in stroke.

Conclusions:

  • Oxygen therapy for ischemic stroke warrants further investigation with improved study designs.
  • Appropriate application of hyperoxia may offer new therapeutic avenues for stroke patients.
  • The potential benefits of oxygen therapy in extending the thrombolysis window require validation in future trials.