{
  "id": "AIBD-0027",
  "title": "Fitbit Alta HR resting heart rate trend leading to early diagnosis and treatment of large vessel vasculitis",
  "summary": "Fitbit Alta HR resting-heart-rate rise from 55 to 75 bpm led to early diagnosis and treatment of large vessel vasculitis (Zurich).",
  "date_observed": "2022-02-28",
  "date_basis": "unassessed",
  "date_precision": "unassessed",
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  "account": "A case report appeared in BMJ Case Reports on 28 February 2022 (event dates not reported). A 57-year-old woman in Zurich, Switzerland, noticed in her Fitbit Alta HR application a persistent rise in resting heart rate. It went from about 55 to about 75 beats per minute over three months, alongside non-specific constitutional symptoms. The elevated resting heart rate led her to seek advice at University Hospital Zurich. FDG-PET with computed tomography (CT) showed inflammation of the aorta and both subclavian and axillary arteries, consistent with large vessel vasculitis. Treatment with prednisone 50 mg daily and tocilizumab produced rapid improvement. Her resting heart rate normalized within 10 days and inflammatory markers within two weeks.",
  "category": "benefit created",
  "unexpected": true,
  "purpose": "The Fitbit Alta HR computes resting heart rate for fitness tracking; it was not built to detect vasculitis, so this benefit was not its purpose.",
  "system": "Fitbit Alta HR resting heart rate (Fitbit app)",
  "model_version": "Fitbit Alta HR",
  "developer": "Fitbit (Google)",
  "deployer": null,
  "location": "Zurich, Switzerland",
  "domain": "Healthcare (rheumatology)",
  "segment": "Consumer wearables",
  "benefit_type": "Improved Physical Health",
  "taxonomy_note": null,
  "registry_ids": {},
  "ratings": [
    {
      "group": "personal",
      "depth": 2,
      "reason": "One woman obtained an earlier diagnosis of giant cell arteritis with large vessel involvement and prompt immunosuppressive treatment that resolved her symptoms. A material benefit to one person."
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    "statement": "The device's resting-heart-rate algorithm produced the trend the patient noticed; there was no alert, and the patient and clinicians drew the inference. The authors credit the elevated resting heart rate with an earlier diagnosis."
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    {
      "kind": "case report",
      "citation": "Gkikopoulos N, Wenger M, Distler O, Becker M (2022). Self-monitoring of the resting heart rate using a fitness tracker smartwatch application leads to an early diagnosis of large vessel vasculitis. BMJ Case Reports 15(2):e245021.",
      "title": "Self-monitoring of the resting heart rate using a fitness tracker smartwatch application leads to an early diagnosis of large vessel vasculitis",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8886383/",
      "date": "2022-02-28",
      "written_by": "independent",
      "quote": "The persistently elevated RHR led the patient to seek medical advice and contributed to an earlier diagnosis of a potentially severe disease."
    },
    {
      "kind": "case report",
      "citation": "Gkikopoulos N et al. (2022). BMJ Case Reports 15(2):e245021.",
      "title": "Self-monitoring of the resting heart rate using a fitness tracker smartwatch application leads to an early diagnosis of large vessel vasculitis",
      "url": "https://doi.org/10.1136/bcr-2021-245021",
      "date": "2022-02-28",
      "written_by": "independent",
      "quote": "Treatment with glucocorticoids and tocilizumab led to a significant improvement of her symptoms and decrease in inflammatory parameters."
    }
  ],
  "replication": {
    "produced_by": [
      "The wearer tracks resting heart rate over months with a Fitbit",
      "A systemic inflammatory illness raises resting heart rate persistently",
      "The wearer brings the trend to a clinician who pursues imaging"
    ],
    "must_hold": [
      "A stable personal baseline exists",
      "The clinician treats the trend as a signal rather than noise",
      "Diagnostic imaging and immunosuppressive therapy are available"
    ],
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  },
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    "database": "AI Incident Database",
    "identifier": "1666",
    "title": "Oura Smart Ring Purchaser in California Alleged Company Overstated AI Sleep-Tracking Accuracy, Leading to Overpayment",
    "url": "https://incidentdatabase.ai/cite/1666",
    "severity": null,
    "group": "personal",
    "basis": "Consumer wearable health metric read in its app: a Fitbit resting-heart-rate trend proved true, while Oura's inferred sleep stages were allegedly less accurate than marketed, harming ring purchasers who relied on them."
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  "headline": "Fitbit Alta HR heart-rate rise leads to vasculitis diagnosis",
  "metric": "resting heart rate had risen persistently from about 55 to about 75 beats per minute",
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  "later": {
    "status": "unknown",
    "date": null,
    "note": "Both cited entries are the same case report; no later development was found.",
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  "value": null,
  "developer_country": "United States",
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    {
      "date": "2026-10-20",
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      "editor": "AIBD"
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    {
      "date": "2026-10-20",
      "change": "Paired with AI Incident Database incident 1666 (medium confidence); severity not given by the source.",
      "source": "https://incidentdatabase.ai/cite/1666",
      "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 Knowledge Discovery among the six first used.",
      "source": "https://trustible.ai/post/a-framework-for-measuring-the-benefits-of-ai/",
      "editor": "AIBD"
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      "date": "2026-10-21",
      "change": "Country of the developer added from the organization's own site or a registry.",
      "source": "https://support.google.com/product-documentation/answer/14816019",
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    {
      "date": "2026-10-21",
      "change": "Prose pass: a rating reason, account rewritten in shorter sentences with abbreviations expanded; facts, figures and quotations unchanged.",
      "source": null,
      "editor": "AIBD"
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  "confidence": "studied",
  "shade": "high",
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        "review_state": "record_mapped",
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                "title": "Self-monitoring of the resting heart rate using a fitness tracker smartwatch application leads to an early diagnosis of large vessel vasculitis",
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        "provenance": {
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          "source_refs": []
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        "review_state": "record_mapped",
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        "state": "not_assessed",
        "review_state": "not_assessed",
        "coverage": "partial"
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      "systems[].model_name": {
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        "review_state": "not_assessed",
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          "kind": "record_fields",
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        "review_state": "record_mapped",
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            "account": "A case report appeared in BMJ Case Reports on 28 February 2022 (event dates not reported). A 57-year-old woman in Zurich, Switzerland, noticed in her Fitbit Alta HR application a persistent rise in resting heart rate. It went from about 55 to about 75 beats per minute over three months, alongside non-specific constitutional symptoms. The elevated resting heart rate led her to seek advice at University Hospital Zurich. FDG-PET with computed tomography (CT) showed inflammation of the aorta and both subclavian and axillary arteries, consistent with large vessel vasculitis. Treatment with prednisone 50 mg daily and tocilizumab produced rapid improvement. Her resting heart rate normalized within 10 days and inflammatory markers within two weeks.",
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              ],
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}