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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...

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Related Experiment Video

Updated: Jun 26, 2026

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity

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Classification of minor stroke: intra- and inter-observer reliability.

Johann R Selvarajah¹, Matthew Glaves, Jane Wainwright

¹Department of Neurology, Leeds General Infirmary, Leeds, UK.

Cerebrovascular Diseases (Basel, Switzerland)

|January 30, 2009

Summary

The Oxfordshire Community Stroke Project (OCSP) and Trial of ORG 10172 in Acute Stroke Treatment (TOAST) classifications showed moderate to excellent intra-observer reliability but only fair to good inter-observer reliability for minor stroke assessment.

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Area of Science:

Neurology
Clinical Medicine
Stroke Research

Background:

The Oxfordshire Community Stroke Project (OCSP) and Trial of ORG 10172 in Acute Stroke Treatment (TOAST) classifications are standard tools for major ischemic stroke assessment.
Their reliability in classifying minor stroke, particularly in outpatient settings, requires further investigation.

Purpose of the Study:

To evaluate the intra- and inter-observer reliability of the OCSP and TOAST classifications for minor stroke.
To assess the consistency of these diagnostic tools among physicians with varying experience levels.

Main Methods:

Four physicians independently classified minor stroke cases using clinical data from 90 patients.
Kappa statistics were used to quantify both intra- and inter-observer agreement for OCSP and TOAST classifications.

Main Results:

Intra-observer reliability for both OCSP and TOAST ranged from moderate to excellent (kappa = 0.48-0.83).
Inter-observer reliability was good for OCSP (kappa = 0.64) but only moderate for TOAST (kappa = 0.42).
Neither classification demonstrated consistent reliability between observers.

Conclusions:

The findings suggest that the OCSP and TOAST classifications may have limited validity for minor stroke in typical outpatient populations.
Variable observer expertise could contribute to the observed inconsistencies in classification reliability.