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Ischemic Stroke l: Introduction01:15

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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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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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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...
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Revised iScore to predict outcomes after acute ischemic stroke.

Sheng-Feng Sung1, Yu-Wei Chen2, Ling-Chien Hung3

  • 1Division of Neurology, Department of Internal Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi City, Taiwan; Min-Hwei College of Health Care Management, Tainan, Taiwan.

Journal of Stroke and Cerebrovascular Diseases : the Official Journal of National Stroke Association
|April 9, 2014
PubMed
Summary

The revised iScore, using Oxfordshire Community Stroke Project (OCSP) classification instead of Trial of Org 10172 in Acute Stroke Treatment (TOAST), accurately predicts outcomes for acute ischemic stroke patients. This simplifies prediction without compromising accuracy.

Keywords:
Acute ischemic strokeoutcomepredictionprognosisrisk score

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Area of Science:

  • Neurology
  • Clinical Prediction Models
  • Stroke Medicine

Background:

  • The iScore is a validated tool for predicting mortality and functional outcomes post-acute ischemic stroke.
  • The iScore utilizes the Trial of Org 10172 in Acute Stroke Treatment (TOAST) classification for stroke subtype, which can be complex to determine.
  • Alternative, simpler stroke classifications may be suitable for integration into prediction scores.

Purpose of the Study:

  • To evaluate if the Oxfordshire Community Stroke Project (OCSP) classification can replace the TOAST classification within the iScore for acute ischemic stroke.
  • To compare the predictive performance of the original iScore with a revised iScore incorporating the OCSP classification.

Main Methods:

  • The original iScore and a revised iScore (TOAST replaced by OCSP) were applied to 3196 acute ischemic stroke patients.
  • Outcome measures included poor functional status (modified Rankin Scale 3-6) at discharge and 3 months.
  • Performance was assessed using discrimination (AUC) and calibration (Pearson correlation).

Main Results:

  • The revised iScore demonstrated comparable discrimination to the original iScore for poor outcomes at discharge (AUC .767 vs .775) and 3 months (AUC .801 vs .810).
  • Both scores showed high correlation between observed and expected outcomes, indicating excellent calibration.
  • The revised iScore reliably predicted clinical outcomes at both time points.

Conclusions:

  • The Oxfordshire Community Stroke Project (OCSP) classification can effectively substitute the Trial of Org 10172 in Acute Stroke Treatment (TOAST) classification in the iScore.
  • The revised iScore offers a practical alternative for predicting acute ischemic stroke outcomes, maintaining predictive accuracy.
  • This simplification may enhance the clinical utility of stroke outcome prediction tools.