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Ischemic Stroke l: Introduction

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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.

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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...

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Modeling Stroke in Mice: Permanent Coagulation of the Distal Middle Cerebral Artery

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Published on: July 31, 2014

Multiple cerebral infarcts following septic shock.

Nages Nagaratnam¹, Vlasios Brakoulias, Kevin Ng

¹Rehabilitation and Aged Care Services, Department of Medicine, Blacktown-Mt Druitt Health, Blacktown, NSW 2148, Australia.

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia

|September 10, 2002

Summary

Septic shock can cause severe neurological deficits, including stroke, due to blood flow changes and clot formation. This case highlights the brain

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Area of Science:

Neurology
Critical Care Medicine
Vascular Neurology

Background:

Septic shock presents a significant challenge in critical care, often leading to multi-organ dysfunction.
Neurological complications in sepsis are increasingly recognized but can be complex to diagnose and manage.

Observation:

A 60-year-old female with septic shock exhibited diverse neurological signs: left hemiparesis, left homonymous hemianopia, coordination disorder, and aphasia.
Neuroimaging revealed bilateral watershed and territorial infarcts, indicating widespread cerebral ischemia.

Findings:

The patient presented with multiple ischemic strokes affecting both anterior and posterior circulation.
Risk factors identified included chronic airways limitation, cardiac failure, and heavy smoking, contributing to a prothrombotic state.
Normal carotid duplex studies suggested the infarcts were not primarily due to large artery stenosis.

Implications:

This case underscores the potential for septic shock to precipitate severe cerebrovascular events, even in the absence of traditional vascular risk factors like carotid stenosis.
Understanding the mechanisms of septic encephalopathy and stroke is crucial for timely intervention and improved patient outcomes.
Flow alterations and thrombus formation are likely key pathophysiological mechanisms driving these neurological deficits in septic shock.