Electronic medical records for discovery research in rheumatoid arthritis

Katherine P. Liao, Tianxi Cai, Vivian Gainer, Sergey Goryachev, Qing Zeng-Treitler, Soumya Raychaudhuri, Peter Szolovits, Susanne Churchill, Shawn Murphy, Isaac Kohane, Elizabeth W. Karlson, Robert M. Plenge

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Objective. Electronic medical records (EMRs) are a rich data source for discovery research but are underutilized due to the difficulty of extracting highly accurate clinical data. We assessed whether a classification algorithm incorporating narrative EMR data (typed physician notes) more accurately classifies subjects with rheumatoid arthritis (RA) compared with an algorithm using codified EMR data alone. Methods. Subjects with ≥1 International Classification of Diseases, Ninth Revision RA code (714.xx) or who had anti-cyclic citrullinated peptide (anti-CCP) checked in the EMR of 2 large academic centers were included in an "RA Mart" (n = 29,432). For all 29,432 subjects, we extracted narrative (using natural language processing) and codified RA clinical information. In a training set of 96 RA and 404 non-RA cases from the RA Mart classified by medical record review, we used narrative and codified data to develop classification algorithms using logistic regression. These algorithms were applied to the entire RA Mart. We calculated and compared the positive predictive value (PPV) of these algorithms by reviewing the records of an additional 400 subjects classified as having RA by the algorithms. Results. A complete algorithm (narrative and codified data) classified RA subjects with a significantly higher PPV of 94% than an algorithm with codified data alone (PPV of 88%). Characteristics of the RA cohort identified by the complete algorithm were comparable to existing RA cohorts (80% women, 63% anti-CCP positive, and 59% positive for erosions). Conclusion. We demonstrate the ability to utilize complete EMR data to define an RA cohort with a PPV of 94%, which was superior to an algorithm using codified data alone. © 2010, American College of Rheumatology.
    Original languageEnglish
    Pages (from-to)1120-1127
    Number of pages7
    JournalArthritis Care & Research
    Volume62
    Issue number8
    DOIs
    Publication statusPublished - Aug 2010

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