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Analysis of Primary Care Computerized Medical Records (CMR) Data With Deep Autoencoders (DAE)

Thomas, Spencer A., Smith, Nadia A., Livina, Valerie, Yonova, Ivelina, Webb, Rebecca and de Lusignan, Simon (2019) Analysis of Primary Care Computerized Medical Records (CMR) Data With Deep Autoencoders (DAE) Frontiers in Applied Mathematics and Statistics, 5, 42.

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Abstract

The use of deep learning is becoming increasingly important in the analysis of medical data such as pattern recognition for classification. The use of primary healthcare computational medical records (CMR) data is vital in prediction of infection prevalence across a population, and decision making at a national scale. To date, the application of machine learning algorithms to CMR data remains under-utilized despite the potential impact for use in diagnostics or prevention of epidemics such as outbreaks of influenza. A particular challenge in epidemiology is how to differentiate incident cases from those that are follow-ups for the same condition. Furthermore, the CMR data are typically heterogeneous, noisy, high dimensional and incomplete, making automated analysis difficult. We introduce a methodology for converting heterogeneous data such that it is compatible with a deep autoencoder for reduction of CMR data. This approach provides a tool for real time visualization of these high dimensional data, revealing previously unknown dependencies and clusters. Our unsupervised nonlinear reduction method can be used to identify the features driving the formation of these clusters that can aid decision making in healthcare applications. The results in this work demonstrate that our methods can cluster more than 97.84% of the data (clusters >5 points) each of which is uniquely described by three attributes in the data: Clinical System (CMR system), Read Code (as recorded) and Read Term (standardized coding). Further, we propose the use of Shannon Entropy as a means to analyse the dispersion of clusters and the contribution from the underlying attributes to gain further insight from the data. Our results demonstrate that Shannon Entropy is a useful metric for analysing both the low dimensional clusters of CMR data, and also the features in the original heterogeneous data. Finally, we find that the entropy of the low dimensional clusters are directly representative of the entropy of the input data (Pearson Correlation = 0.99, R2 = 0.98) and therefore the reduced data from the deep autoencoder is reflective of the original CMR data variability.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Biosciences and Medicine
Authors :
NameEmailORCID
Thomas, Spencer A.
Smith, Nadia A.
Livina, Valerie
Yonova, Ivelinai.yonova@surrey.ac.uk
Webb, Rebeccabecca.webb@surrey.ac.uk
de Lusignan, SimonS.Lusignan@surrey.ac.uk
Date : 6 August 2019
Funders : Department of Business, Engineering and Industrial Strategy
DOI : 10.3389/fams.2019.00042
Grant Title : Digital Health
Copyright Disclaimer : Copyright © 2019 Thomas, Smith, Livina, Yonova,Webb and de Lusignan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Uncontrolled Keywords : Deep learning; Primary healthcare; Computerized medical records; Heterogeneous data; Visualization; Dimensionality reduction
Depositing User : Diane Maxfield
Date Deposited : 17 Sep 2019 16:17
Last Modified : 17 Sep 2019 16:17
URI: http://epubs.surrey.ac.uk/id/eprint/852656

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