Research On Information Exchange Of Electronic Patient Records Based On HL7 CDA

With the development of informationalization in hospitals, the research focus in Hospital Information System ( HIS ) area has moved from the payment management-centered systems to the patient-centered, so that many new healthcare systems has brought out. Under the framework of Integrating the Healthcare Enterprise (IHE), different kinds of healthcare systems are more inclined to be integrated. Electronic Patient Records (EPR) based on their integration has become the important direction of hospital informationalization development.EPR is widely used in the clinical work such as patient transfer and long-distance consultation in America and European countries, while the EPR construction in China begins very late. One of the main reasons is that the lag of healthcare information standardization is the obstacle of EPR's development. Since the expression and transfer format of healthcare information differs, EPRs can not exchange information effectively among different systems, not to mention the full utilization of the clinical information.Based on the broad review of the status quo of EPR application and standardization in China and abroad, the HL7 messaging standards and the clinical document architecture (CDA) specifications are deeply researched. The information models of CDA standards are applied to the encapsulation of EPR documents. A sample and its fomatted output are implemented with XML. Meanwhile the automatic generation and parse of CDA documents is implemented with JDBC and XML parser in order to make the best of the existing database resources. HL7 standards are applied to the exchange of EPR. The CDA documents are wrapped in HL7 messages and transferred in EPR request and response through the binding of SOAP and HTTP. The EPR information exchange among hospitals is feasible by building the regional EPR center.