A Mobile App Architecture for Accessing EMRs Using XDS and FHIR Enabling data exchange between electronic medical records (EMRs) and personal health apps has the potential to boost the secondary usage of health data, eventually increasing the quality of life. In this paper, the authors present a mobile app architecture that enables the integration of legacy crossenterprise document sharing (XDS) and next generation fast healthcare interoperability resources (FHIR) compatible electronic medical record (EMR) systems with personal mobile applications. The realization of this architecture is achieved by linking EMR information from multiple providers at the point of care, with a personal health app for citizens, combining the benefits and potential of both XDS and FHIR.

Scaling Blockchains to Support Electronic Health Records for Hospital Systems Electronic Health Records (EHRs) have improved many aspects of healthcare and allowed for easier patient management for medical providers. Blockchains have been proposed as a promising solution for supporting Electronic Health Records (EHRs), but have also been linked to scalability concerns about supporting realworld healthcare systems. This paper quantifies the scalability issues and bottlenecks related to current blockchains and puts into perspective the limitations blockchains have with supporting healthcare systems. Particularly we show that well known blockchains such as Bitcoin, Ethereum, and IOTA cannot support transactions of a large scale hospital system such as the University of Kentucky HealthCare system and leave over 7.5M unsealed transactions per day. We then discuss how bottlenecks of blockchains can be relieved with sidechains, enabling wellknown blockchains to support even larger hospital systems of over 30M transactions per day. We then introduce the PatientHealthchain architecture to provide future direction on how scaling blockchains for EHR systems with sidechains can be achieved.