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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.

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Disability and Recurrent Stroke Among Participants in Stroke Prevention Trials.

Adam de Havenon¹, Catherine Viscoli², Dawn Kleindorfer³

¹Department of Neurology, Center for Brain and Mind Health, Yale University School of Medicine, New Haven, Connecticut.

JAMA Network Open

|July 19, 2024

Summary

Higher poststroke disability increases the risk of recurrent stroke and major cardiovascular events (MACE). Including more disabled patients in stroke prevention trials could enhance study power and generalizability.

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Area of Science:

Neurology
Cardiology
Clinical Trials

Background:

Stroke secondary prevention trials often exclude individuals with significant poststroke disability.
The impact of this enrollment bias on trial outcomes and generalizability is not well understood.

Purpose of the Study:

To examine the association between the level of functional disability after a stroke and the long-term risk of experiencing a recurrent stroke.
To investigate the relationship between poststroke disability and the occurrence of major adverse cardiovascular events (MACE).

Main Methods:

A post hoc analysis was conducted using data from two large clinical trials: the Prevention Regimen For Effectively Avoiding Second Strokes (PRoFESS) and the Insulin Resistance Intervention After Stroke (IRIS).
Participants were categorized based on their modified Rankin Scale (mRS) score at baseline, indicating their level of disability (0, 1-2, or 3+).
Recurrent stroke and MACE rates were compared across disability groups using statistical analysis, including hazard ratios.

Main Results:

Higher baseline disability (mRS 3+) was significantly associated with increased rates of recurrent stroke in both PRoFESS and IRIS trials.
Patients with greater disability also showed a higher incidence of MACE compared to those with no or mild disability.
Hazard ratios indicated a significantly increased risk for recurrent stroke and MACE in individuals with higher mRS scores.

Conclusions:

Baseline poststroke functional status is a critical factor influencing the risk of recurrent stroke and MACE.
Clinical trials for stroke secondary prevention should aim to include a broader spectrum of patients, including those with moderate to severe disability.
Increased inclusion of disabled participants can improve the statistical power and real-world applicability of stroke prevention research.