Improve Patient Safety Intelligence Using AWS AI/ML Services

June 19, 2023 Terrell Rohm

Today, healthcare organizations rely on a combination of automated and manual processes to compose, review, and classify patient safety reports. These reports are entered manually by front-line clinicians into the RL Datix reporting system. This entry includes both discrete data points as well as a free-text narrative. Although the data collection process may begin with the digital capture of data, once entered, the data generally remains inaccessible throughout the organization in terms of real-time trending and analysis. Each reporter sees only the adverse events they have reported. Unit and file managers are given broader access relevant to their unit or service line authority, but often the data remains in its raw format due to the textual nature of the event descriptions. As a result, patterns across the organization, such as an increase in infections or medication errors, are unit or service line dependent and appear to be isolated events.

The current analysis of these reports is achieved through a combination of built-in reports/graphics depending on the software, manual data manipulation, and the display of discrete fields. Analysis is siloed to the respective units or authorities while an organization-wide or region-wide analysis is dependent on the employment of multiple patient safety analysts and data specialists. Additional reports may include separate databases and spreadsheets to triangulate around specific issues. In academic medical centers (AMCs), this process requires dedicated time, people, and resources. AMCs need a technology solution that can automate the analytical processes to free dedicated resources for much needed patient care improvement initiatives and activities.

As a Proof of Concept (POC), we focused on the automated analysis of medication-related patient safety reports. The proposed solution intends to reduce manual analytical work and inefficiencies in current workflows, reduce time-to-insight, improve the information extracted from daily reports, and uncover patterns across reports and throughout the organization. We collaborated with University of Utah Health on this POC project, using five years of medication-related patient safety reports to fine-tune a couple of generalized and domain specific language models using Amazon SageMaker. This approach classifies the severity of errors using discrete fields, identifies high risk medications from text narratives, and visualizes high-risk medication-related events within the corresponding harm levels.

Solution overview

Amazon Comprehend Medical was used to detect high risk medications, and the results were summarized in a functional, interactive dashboard built upon Amazon QuickSight. The entire data processing pipeline was automated using event driven, serverless architecture via AWS Lambda. Given the fact that patient safety reports contain private and sensitive information, all of the services used in this solution are HIPAA eligible, and the project was carried out in a HIPAA-compliant landing zone account. In addition, de-identification of the patient safety reports was achieved using Amazon Comprehend Medical DetectPH API, which has been demonstrated in this post and reference solution.

To improve efficiency of the patient safety reporting process, we have refined and compared different transformer based LLMs in AWS partner Huggingface to effectively detect and classify high risk medications based on free-text descriptions in the reports (see Table 1). A sample Jupyter notebook was prepared and it can be shared with academic medical centers for further customization. The architectural diagram in the following figure outlines the potential steps for patient safety professionals to run this solution on AWS.

Architecture Diagram of the solution for patient safety intelligence

Figure 1. Architecture Diagram of the solution for patient safety intelligence

Additionally, to provide a secure and compliant machine learning (ML) environment, Amazon SageMaker, data encryption, network isolation, authentication, and authorization are set as the default.

Launch Stack

Key features include:

If you want to have a secure research environment through a lockdown Virtual Desktop Infrastructure (VDI) without screen copy, then you can use Amazon AppStream 2.0 or Amazon Workspaces to access Amazon SageMaker domain presigned URL.

This solution leverages AWS Analytics and artificial intelligence/machine learning (AI/ML) services for automatic data processing, information extraction, and AI predictions upon patient safety reports. High-alert medications, extracted from the standard high-risk medication list compiled by the Institute for Safe Medication Practices (ISMP), have been consolidated into RxNorm concepts. These were used to map the named entities with alternative synonyms extracted by Amazon Comprehend Medical. They were further analyzed and displayed on an Amazon QuickSight dashboard (see the following figure). The dashboard displays multiple visualizations of the data both independently from discrete fields (such as counts by Safety Event Codes) and data from textual fields (counts of High Alert Medications), and also combines data from both discrete and textual sources as demonstrated by the Combination chart. Finally, the capacity to drill down by individual Patient Safety Codes and the corresponding High Alert Medications is provided. Note that a cell size of five or less has been removed for privacy purposes. This approach could additionally be constructed by location, time of day, or any other discrete data element.

Figure 2. Example dashboard for high alert medications extracted by Amazon Comprehend Medical

Outcomes

Using the AI approach as described in the following, a comparison analysis for AI prediction POC results are found in Table 1. The general results range in Precision from .881 to .901; Recall from .874 to .899; Accuracy from .874 to .899; and F1 score of .873 to .899 depending on the application.

 

Table 1. AI Model prediction results to classify level of harms based on free text description

Conclusion

Given the success of this POC project, we plan to engage with an AWS partner to build other use case applications and to test a production-ready system that includes complete clinical data. This data can lead to additional metrics, models, and improvements. Furthermore, given the need for manual entry of clinical information into the patient safety reporting system, efforts are underway to integrate electronic health record (EHR) information into the analysis.

ML is an effective tool to improve efficiency, reduce time to insight, and unearth potentially hidden information in medication-related patient safety reports. Given these results, it would be valuable to continue to improve outcome scores, expand this effort to other areas of patient safety reporting, and investigate integration with other clinical and demographic data sources.

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