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Related Experiment Video

Updated: Feb 18, 2026

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Systemic Inflammation and Recurrence After Atrial Fibrillation-Related Stroke: An Individual Participant Data

John J McCabe1,2,3, Katie Harris4, Sarah Gorey1,2,3

  • 1Health Research Board (HRB) Stroke Clinical Trials Network Ireland (SCTNI), Ireland.

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Summary
This summary is machine-generated.

Inflammation markers like hsCRP are linked to recurrent cardiovascular events after stroke, regardless of atrial fibrillation (AF) history. This supports including AF patients in anti-inflammatory trials based on elevated inflammation levels.

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Area of Science:

  • Cardiovascular Medicine
  • Neurology
  • Immunology

Background:

  • Atrial fibrillation (AF) stroke recurrence risk is high despite anticoagulation, necessitating novel therapies.
  • Inflammation plays a key role in AF, yet AF patients were excluded from anti-inflammatory trials.
  • The association between IL-6/hsCRP and poststroke recurrence in relation to AF status is unclear.

Purpose of the Study:

  • To analyze the association between IL-6/hsCRP and stroke/MACE recurrence stratified by AF status.
  • To determine if AF modifies the link between inflammatory markers and vascular recurrence.
  • To inform future trial designs for anti-inflammatory therapies.

Main Methods:

  • Individual participant data from 11 prospective studies were analyzed.
  • Multivariable Cox regression models assessed associations between IL-6/hsCRP and recurrent stroke/MACEs.
  • Analyses were stratified by AF status and adjusted for confounders.

Main Results:

  • Higher inflammatory markers (IL-6, hsCRP) were observed in patients with AF.
  • hsCRP associated with recurrent MACEs irrespective of AF status (Pinteraction=0.30).
  • No significant association was found between hsCRP and recurrent stroke; IL-6 showed no AF interaction for MACEs or stroke recurrence.

Conclusions:

  • Inflammatory mechanisms are crucial for vascular recurrence, independent of AF.
  • These findings support including AF patients in anti-inflammatory therapy trials.
  • Future trials should consider selecting patients based on elevated inflammatory markers, not solely stroke etiology.