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    "story_id": "mp-2026-08-03-012",
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    "headline": "The Arrhythmia Circuit Hid Between the Heart's Surfaces",
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    "dek": "Patient-specific digital twins linked through-wall fibrosis patterns to endocardial and epicardial electrical separation.",
    "summary": "Patient-specific digital twins linked through-wall fibrosis patterns to endocardial and epicardial electrical separation.",
    "body_text": "MRI-derived bi-atrial digital twins from 21 people with persistent atrial fibrillation produced 91 reentry-sustaining regions for comparison with 73 controls. Reentry regions showed substantially greater voltage and activation-time differences between inner and outer atrial surfaces, while fibrosis percentage and through-wall dissimilarity independently tracked reentry. The work is mechanistic simulation evidence, not a tested ablation protocol.",
    "why_it_matters": "Patient-specific digital twins linked through-wall fibrosis patterns to endocardial and epicardial electrical separation.",
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      "The work is mechanistic simulation evidence, not a tested ablation protocol."
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    "first_published_at": "2026-08-03T09:00:00.000-04:00",
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        "qualification": "The work is mechanistic simulation evidence, not a tested ablation protocol."
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    "tags": [
      "atrial fibrillation",
      "digital twins",
      "fibrosis"
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    {
      "source_id": "source-2026-08-03-012",
      "title": "The Journal of Physiology: transmural fibrosis in persistent atrial fibrillation",
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