Integrating and Querying Patient’s Medical Data

Although the original purpose of the HL7’s Continuity of Care Documents (CCD) was to deliver clinical summaries between healthcare organizations, nowadays they are increasingly used for collecting patients’ health documentation from various healthcare providers. Usually the collected CCD documents are organized into hierarchical structures that simplify the search of documents, e.g., grouping together the documents by episode, clinical specialty or time period. Yet each clinical document is stored as a stand-alone artifact, meaning that each document is complete and whole in itself. Considering each document only as a complete and a whole in itself also has its drawback: the efficient usage of patients’ health documentation often is data centric, meaning that data should be extracted from various documents and then integrated according to specific criteria. Processing such queries requires the integration of the data of the CCD documents. In this paper, we present two ontology-based methods for the integration. Which of the methods is appropriate depends on whether the header or the whole CCD documents are based on the HL7 RIM.