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  "documentTitle": "iRhythm Technologies, Inc. (IRTC)",
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  "authorName": "Spruce Point Capital Management",
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  "presentationDate": "2025-08-18 00:00:00",
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  "notes": "Uses excerpts from an FDA Form 483 and a legal complaint to undermine the company's technical credibility.",
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      "text": "It’s easy to claim your algorithm is accurate when the data used to evaluate its accuracy excludes mistakes. We believe these failures of simple data analytics (far short of anything approaching AI) reflect poorly on iRhythm’s internal capabilities and external motivations.",
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      "text": "iRhythm claims it has developed “proprietary artificial intelligence, including a deep-learned neural network model” to analyze patient data and frequently references the Company’s past involvement with renowned AI researcher Andrew Ng. However, the 2024 FDA Form 483 (San Francisco) revealed that the Company’s internal analysis misstated the accuracy of its algorithm.",
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      "text": "‘One of the CCTs…recalled that the ‘Zio AT has only a single lead, meaning you only get a very narrow view of the heart,’ whereas many fellow iRhythm CCTs with previous experience ‘found that… a regular Holter monitor [has] six leads and gives a much better read of cardiac activity.’ One of these former CCTs ‘found missed arrythmias that were not reported to cardiologists in 100% of final reports they analyzed, which they blamed on the technical limitations of the Zio AT and iRhythm’s processes for classifying arrhythmias.’… Thus, the ‘initial reports could be inaccurate and require massaging before being submitted to cardiologists.’ This CCT stated, ‘I found the reports to be inaccurate and alarming as a technician.’” — Glazing v iRhythm Second Amended Complaint",
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      "kind": "source-note",
      "text": "Red box for Spruce Point emphasis. Source: FDA Form 483 dated 7/31/24 (San Francisco), Glazing v iRhythm second amended complaint (Case No. 3:24-cv-706-JSC document 43)",
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      "text": "Excerpts from FDA Form 483 and Glazing v iRhythm complaint detailing algorithm failures and data exclusion.",
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      "kind": "title",
      "text": "iRhythm Touts Its Use of AI To Analyze Patient Data, Yet The FDA Identified Accuracy (And Competency) Issues",
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