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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...

Ischemic Stroke ll: Pathophysiology

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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

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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: Introduction

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Ovariectomy and 17β-estradiol Replacement in Rats and Mice: A Visual Demonstration

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Complexities of oestrogen in stroke.

Hilary V O Carswell¹, I Mhairi Macrae, Tracy D Farr

¹Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 27 Taylor Street, Glasgow G4 0NR, Scotland, U.K. hilary.carswell@strath.ac.uk

Clinical Science (London, England : 1979)

|December 17, 2009

Summary

Oestrogen may protect against stroke, but hormone-replacement therapy (HRT) trials show it can increase stroke risk. This review examines oestrogen

Area of Science:

Neuroscience
Endocrinology
Cardiovascular Research

Background:

Oestrogen's role in stroke is complex, with potential protective effects suggested by animal models.
However, clinical data, including hormone-replacement therapy (HRT) trials, indicate oestrogen may increase stroke incidence and negatively impact outcomes.
Previous reviews have often omitted these detrimental effects.

Purpose of the Study:

To provide a balanced review of oestrogen's effects on stroke, including both beneficial and detrimental aspects.
To explore potential mechanisms underlying oestrogen's dual role in stroke.
To assess the translational relevance of pre-clinical findings to clinical stroke scenarios.

Main Methods:

Systematic review of existing literature on oestrogen and stroke.

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Analysis of pre-clinical (animal models) and clinical (HRT trials) data.

Examination of meta-analyses and published reviews.

Main Results:

While oestrogen shows neuroprotective effects in animal models of ischaemia, clinical evidence suggests it can increase stroke risk in post-menopausal women.
Detrimental effects of oestrogen on stroke outcome are supported by HRT trial meta-analyses and some pre-clinical studies.
A discrepancy exists between pre-clinical findings and clinical outcomes, questioning the direct translation of oestrogen as a stroke therapy.

Conclusions:

Oestrogen cannot be promoted as a stroke therapy due to conflicting evidence and potential harm.
Understanding the mechanisms behind oestrogen's dual effects is crucial for accurate therapeutic assessment.
Further research is needed to reconcile pre-clinical and clinical findings regarding oestrogen's impact on stroke.