A modular pipeline for natural language processing-screened human abstraction of a pragmatic trial outcome from electronic health records
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Background
Natural language processing (NLP) allows efficient extraction of clinical variables and outcomes from electronic health records (EHR). However, measuring pragmatic clinical trial outcomes may demand accuracy that exceeds NLP performance. Combining NLP with human adjudication can address this gap, yet few software solutions support such workflows. We developed a modular, scalable system for NLP-screened human abstraction to measure the primary outcomes of two clinical trials.
Methods
In two clinical trials of hospitalized patients with serious illness, a deep-learning NLP model screened EHR passages for documented goals-of-care discussions. Screen-positive passages were referred for human adjudication using a REDCap-based system to measure the trial outcomes. Dynamic pooling of passages using structured query language (SQL) within the REDCap database reduced unnecessary abstraction while ensuring data completeness.
Results
In the first trial (N=2,512), NLP identified 22,187 screen-positive passages (0.8%) from 2.6 million EHR passages. Human reviewers adjudicated 7,494 passages over 34.3 abstractor-hours to measure the cumulative incidence and time to first documented goals-of-care discussion for all patients with 92.6% patient-level sensitivity. In the second trial (N=617), NLP identified 8,952 screen-positive passages (1.6%) from 559,596 passages at a threshold with near-100% sensitivity. Human reviewers adjudicated 3,509 passages over 27.9 abstractor-hours to measure the same outcome for all patients.
Conclusion
We present the design and source code for a scalable and efficient pipeline for measuring complex EHR-derived outcomes using NLP-screened human abstraction. This implementation is adaptable to diverse research needs, and its modular pipeline represents a practical middle ground between custom software and commercial platforms.
