Abstract
We developed a code and data-driven system (learning healthcare system) for gleaning actionable clinical insight from interventional radiology (IR) data. To this end, we constructed a workflow for the collection, processing and analysis of electronic health record (EHR), imaging, and cancer registry data for a cohort of interventional radiology patients seen in the IR Clinic at our institution over a more than 20-year period. As part of this pipeline, we created a database in REDCap (VITAL) to store raw data, as collected by a team of clinical investigators and the Data Coordinating Center at our university. We developed a single, universal pre-processing codebank for our VITAL data in R; in addition, we also wrote widely extendable and easily modifiable analysis code in R that presents results from summary statistics, statistical tests, visualizations, Kaplan-Meier analyses, and Cox proportional hazard modeling, among other analysis techniques. We present our findings for a test case of supra versus infra-inguinal ligament stenting. The developed pre-processing and analysis pipelines were memory and speed-efficient, with both pipelines running in less than 2 min. Three different supra-inguinal ligament veins had a statistically significant improvement in vein diameters post-stenting versus pre-stenting, while no infra-inguinal ligament veins had a statistically significant improvement (due either to an insufficient sample size or a non-significant p value). However, infra-inguinal ligament stenting was not associated with worse restenosis or patency outcomes in either a univariate (summary-statistics and Kaplan-Meier based) or multivariate (Cox proportional hazard model based) analysis.
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This research was funded by the Stanford Medical Scholars Program, as well as the Stanford University Department of Radiology, CHA University Bundang Medical Center and Shanghai General Hospital in the form of salary support for D.M.C., G.S.J, and X.A., respectively.
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L.V.H. is a consultant for Cook Medical and has received royalties and/or equity payouts from Cook Medical, Boston Scientific, Medtronic and Confluent Medical. L.V.H. is also a co-founder, current member of the Board of Directors, and has equity at Grand Rounds. W.K. is a consultant for Walk Vascular. D.Y.S. is/has been a consultant for the following companies in the last 3 years: Astra-Zeneca, Bayer, BlackSwan Vascular, Boston Scientific, Bristol Myers Squibb, BTG, Eisai, EmbolX, W. L. Gore, Janssen, Koli Medical, RadiAction Medical, Terumo. In addition, D.Y.S. has/has received equity from Confluent Medical and Proteus Digital Health. Finally, D.Y.S. has/has had institutional support in the last 3 years from BTG, W. L. Gore, Merit Medical, and Sirtex.
We received Institutional Review Board approval at our institution. For this retrospective study, formal consent was not required. This article does not contain any studies with animals performed by any of the authors.
This work has been previously published as a pre-print on Research Gate at the following URL:
We have made subsequent edits to the paper that was pre-printed to Research Gate to arrive at the paper draft in its current form.
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IRB: Approved by Stanford IRB, VITAL #33192
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Cohn, D.M., Mabud, T.S., Arendt, V.A. et al. Toward Data-Driven Learning Healthcare Systems in Interventional Radiology: Implementation to Evaluate Venous Stent Patency. J Digit Imaging 33, 25–36 (2020). https://doi.org/10.1007/s10278-019-00280-6
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DOI: https://doi.org/10.1007/s10278-019-00280-6