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Hemorrhagic Stroke ll: Pathophysiology

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...

Stroke: Introduction and Types

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...

Ischemic Stroke l: Introduction

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: Pathophysiology

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...

Hemorrhagic Stroke l: Introduction

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...

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Related Experiment Video

Updated: Jun 19, 2026

Continuous Manual Exchange Transfusion for Patients with Sickle Cell Disease: An Efficient Method to Avoid Iron Overload

Continuous Manual Exchange Transfusion for Patients with Sickle Cell Disease: An Efficient Method to Avoid Iron Overload

Published on: March 14, 2017

Sickle cell disease and stroke.

Luis A Verduzco¹, David G Nathan

¹Harvard Medical School, Boston, MA, USA.

|October 3, 2009

Summary

This summary is machine-generated.

Sickle cell disease (SCD) patients face high stroke risk. Future management focuses on avoiding transfusions through hydroxyurea, anti-inflammatory drugs, and genetic therapies to prevent stroke.

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Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Published on: November 5, 2019

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Last Updated: Jun 19, 2026

Continuous Manual Exchange Transfusion for Patients with Sickle Cell Disease: An Efficient Method to Avoid Iron Overload

Continuous Manual Exchange Transfusion for Patients with Sickle Cell Disease: An Efficient Method to Avoid Iron Overload

Published on: March 14, 2017

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Published on: November 5, 2019

Area of Science:

Neurology
Hematology
Genetics

Background:

Sickle cell disease (SCD) carries a significant risk of stroke, affecting 24% of patients by age 45.
While blood transfusions reduce stroke risk in high-risk patients identified by transcranial Doppler, they present challenges like alloimmunization and iron overload.
Transfusion withdrawal can increase rebound stroke risk, and current methods like extended blood typing are not universally adopted.

Purpose of the Study:

To explore alternative strategies for stroke risk reduction in sickle cell disease (SCD) patients.
To investigate the limitations of current transfusion-based stroke prevention methods.
To identify future directions in SCD stroke management, focusing on transfusion avoidance.

Main Methods:

Review of existing literature on stroke in SCD, transfusion efficacy, and alloimmunization.
Analysis of factors influencing stroke risk, including viscosity and inflammation.
Exploration of emerging therapies such as hydroxyurea, anti-inflammatory agents, and genetic modulation of fetal hemoglobin.

Main Results:

Transcranial Doppler has limited specificity, and transfusions are associated with alloimmunization and iron overload.
Exchange transfusions are more effective for oxygen transport efficiency in SCD due to hyperviscosity but are complex.
Inflammation may be a more significant factor than viscosity in large-vessel stroke development.

Conclusions:

The future of SCD stroke management involves minimizing or avoiding blood transfusions.
Hydroxyurea and anti-inflammatory therapies show promise in reducing transfusion dependency.
Genome-wide association studies offer potential for modulating fetal hemoglobin to mitigate stroke risk and other SCD complications.