{
  "id": "AIBD-0286",
  "title": "Smartwatch “heart arrhythmias” alert leads to a diagnosis of PAC-induced cardiomyopathy in a 34-year-old man; ablation lifts his ejection fraction from 15% to 50%",
  "summary": "Göttingen: a smartwatch alert in an asymptomatic 34-year-old revealed frequent premature atrial contractions and LVEF 35%, later 15%; radiofrequency ablation restored LVEF to 50% at six months.",
  "date_observed": "2025-04-15",
  "date_basis": "unassessed",
  "date_precision": "unassessed",
  "benefit_status": null,
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  "account": "Soubh, Rasenack, Haarmann, Zabel and Bergau reported a case in European Heart Journal - Case Reports. The authors are at the Department of Cardiology and Pneumology, University Medical Center Göttingen, Germany. It was published 15 April 2025. The event dates are not given. A 34-year-old man with no medical history consulted his primary care physician. His smartwatch had detected “heart arrhythmias” while he was asymptomatic. A 12-lead electrocardiogram (ECG) showed sinus rhythm with frequent premature atrial contractions (PACs). A cardiologist found a left ventricular ejection fraction of 35% with a dilated ventricle. Despite guideline-directed heart-failure therapy he returned months later with palpitations and chest pain. Cardiac magnetic resonance imaging (MRI) showed LVEF 15%. Coronary disease was excluded by computed tomography (CT) angiography. Holter recordings showed a PAC burden of 30–50%. High-density 3D mapping located the ectopic focus at the left inferior pulmonary vein. Radiofrequency ablation terminated the arrhythmia. At six months he was symptom-free with LVEF 50% and fewer than 1% PACs. Spironolactone was stopped. The authors call it the first reported PAC-related arrhythmia-induced cardiomyopathy initially detected by a wearable. The watch's brand, model and the form of its alert are not stated.",
  "category": "benefit created",
  "unexpected": false,
  "purpose": "Smartwatch arrhythmia alerts are built to prompt medical review of irregular rhythms. The alert here served that purpose. The condition it uncovered, PAC-induced cardiomyopathy, is one the authors say wearables are not usually credited with finding.",
  "system": "Smartwatch arrhythmia detection (brand and model not stated)",
  "model_version": null,
  "developer": "Not stated (the report does not name the device's maker)",
  "deployer": null,
  "location": "Göttingen, Germany",
  "domain": "Healthcare (cardiology; heart failure)",
  "segment": "Consumer wearables",
  "benefit_type": "Improved Physical Health",
  "taxonomy_note": null,
  "registry_ids": {},
  "ratings": [
    {
      "group": "personal",
      "depth": 3,
      "reason": "The alert started a chain that diagnosed a cardiomyopathy. The condition progressed to LVEF 15%. Ablation reversed it to LVEF 50% with resolution of symptoms. The authors present early detection as what allowed the heart failure to be treated before further progression."
    }
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  "ai_role": {
    "status": "assessed",
    "statement": "The watch's detection of “heart arrhythmias” is what sent an asymptomatic man to his doctor. Everything after (ECG, echo, MRI, mapping, ablation) was clinical. The report does not say what the watch flagged, whether a notification or an ECG reading, nor which algorithm. The device's contribution is therefore established only as the trigger."
  },
  "evidence": [
    {
      "kind": "case report",
      "citation": "Soubh N, Rasenack E, Haarmann H, Zabel M, Bergau L (2025). Smartwatch-enabled early detection and treatment of cardiomyopathy induced by premature atrial contractions: a case report. European Heart Journal - Case Reports 9(4):ytaf151. doi:10.1093/ehjcr/ytaf151 (PMC12209856).",
      "title": "Smartwatch-enabled early detection and treatment of cardiomyopathy induced by premature atrial contractions: a case report",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12209856/",
      "date": "2025-04-15",
      "written_by": "independent",
      "quote": "A 34-year-old male with no prior medical history consulted his primary care physician after his smartwatch detected ‘heart arrhythmias’."
    },
    {
      "kind": "case report",
      "citation": "Soubh N et al. (2025), Eur Heart J Case Rep 9(4):ytaf151, outcome.",
      "title": "Smartwatch-enabled early detection and treatment of cardiomyopathy induced by premature atrial contractions: a case report",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12209856/",
      "date": "2025-04-15",
      "written_by": "independent",
      "quote": "At the six-month follow-up, the patient was symptom-free with a recovered LVEF of 50%."
    },
    {
      "kind": "case report",
      "citation": "Soubh N et al. (2025), Eur Heart J Case Rep 9(4):ytaf151, discussion.",
      "title": "Smartwatch-enabled early detection and treatment of cardiomyopathy induced by premature atrial contractions: a case report",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12209856/",
      "date": "2025-04-15",
      "written_by": "independent",
      "quote": "To the best of our knowledge, this is the first reported case of PAC-related AiCM initially detected by a wearable device."
    }
  ],
  "replication": {
    "produced_by": [
      "An asymptomatic wearer whose smartwatch flagged arrhythmias and who took the flag to a physician",
      "A primary care ECG followed by cardiology work-up including echocardiography, MRI and Holter monitoring",
      "An electrophysiology service able to map and ablate a high-burden PAC focus"
    ],
    "must_hold": [
      "The PAC burden is high enough to be caught by the watch and to cause the cardiomyopathy. The authors note case reports typically exceed 30%.",
      "The ventricular dysfunction is still reversible when the arrhythmia is eliminated"
    ],
    "echoes": []
  },
  "paired_incident": null,
  "headline": "Smartwatch alert uncovers PAC cardiomyopathy; LVEF 15% to 50%",
  "metric": "radiofrequency ablation restored LVEF to 50% at six months",
  "comparator": {
    "against": "the same patient's LVEF before the radiofrequency ablation that the smartwatch alert led to (a treatment effect, not a with-versus-without-device comparison)",
    "before": "15%",
    "after": "50%",
    "basis": "measured",
    "quote": "In our case, the ablation of the PACs not only eliminated symptoms but also led to a remarkable improvement in LVEF, from 15% to 50%.",
    "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12209856/"
  },
  "later": {
    "status": "unknown",
    "date": null,
    "note": "Nothing after the six-month follow-up in the report was found.",
    "quote": null,
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  },
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  "brief_notes": null,
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    {
      "date": "2026-10-20",
      "change": "Record drafted from the cited sources.",
      "source": null,
      "editor": "AIBD"
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    {
      "date": "2026-10-21",
      "change": "Added what the benefit is measured against from the cited sources.",
      "source": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12209856/",
      "editor": "AIBD"
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      "date": "2026-10-21",
      "change": "Benefit type set to Improved Physical Health under Trustible's full taxonomy of 23 types; it was Improved Accessibility among the six first used.",
      "source": "https://trustible.ai/post/a-framework-for-measuring-the-benefits-of-ai/",
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      "change": "Prose pass: a rating reason, account, purpose, the replication conditions, the system's part rewritten in shorter sentences with abbreviations expanded; facts, figures and quotations unchanged.",
      "source": null,
      "editor": "AIBD"
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  "confidence": "studied",
  "shade": "high",
  "claim_status": "Independently studied",
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}