Mobile access to Health Documents - Supplement revision 2

This work item strives to revise the MHD profile supplement to align with the HL7 FHIR standard that has entered DSTU phase.

Working directory

using the IHE ftp site ftp://ftp.ihe.net/IT_Infrastructure/iheitiyr12-2014-2015/Technical_Cmte/Workitems/MHD2/

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Decisions

• Supplement published on the external IHE web site -- www.ihe.net -- will be updated with the new Volume 1 material, and have Volume 2 material removed so as to not cause people to implement original MHD transaction model. The new supplement will point at MHD Status for status updates.
• We presume current DSTU must be used as-is.
  • MHD will need to use extensions where current DSTU is insufficient
• Only FindDocuments and FindSubmissionSets will be supported on query.
• Current focus on Volume 2 transactions and minimal guidance to data element cross-reference
  • Detailed data element text will continue to be developed on the wiki
  • Mapping XDS Attributes to FHIR

Detailed work and notes

• Mapping each XDS object/attribute to FHIR, and back
  • Bill Majurski
  • FHIR Terminology for XDS Dummies
  • Bills FHIR Page
  • Mapping XDS Attributes to FHIR
  • MHD Volume 3 (draft)
  • MHD Implementation Guide
• Scope of MHD vs FHIR
  • John Moehrke
  • Reevaluation of target audience. Are the limitations we put into MHD still the right limitations, or should we relax them if we can?
  • Rationalize IHE specifically only providing JSON, yet FHIR has both.
  • MHD supports only one document in one submissionSet
  • MHD does one transaction to publish
  • do we add Options to MHD to support more complex interactions?
• FHIR Provenance Resource Mapping
  • Rob Horn
• Transport Pattern Mapping
  • Walco Van Loon
  • FHIR has many transaction patterns -- REST, Mailbox, etc.
  • Publication in MHD is one transaction
• Analysis of FHIR and IHE Lifecycle
  • Erik Pupo
  • How to handle PatientInfo, as FHIR would tend to simply update a master PatientInfo where in XDS this information is stored as is.
  • Document relationships
• Tracking and Monitoring of business level changes (politics) and outreach
  • Erik Pupo

Extensions

FHIR has a formal mechanism for transporting extensions, where XDS allows for additional slots with minimal management of namespace using well formed URN. Therefore we need to provide guidance on how a FHIR extension would be handled by an XDS environment; and also how an XDS extension would be handled in a proper FHIR extension. Going from FHIR to XDS is likely more deterministic, where as it is not clear how one would create a proper FHIR extension when a proxy implementation sees a proper XDS new slot.

There are three categories of extensions to be considered:

• Some FHIR extensions will be required to have the DocumentReference resource act as a suitable container for the existing DocumentEntry content. These are created in the base translation from ebRIM to FHIR.
• Translation of Extra Slots in the ebRIM binding to FHIR extensions.
• Translation of FHIR extensions (not including the first category above) to Extra Slots

It is possible to spec out a bi-directional translation mechanism that will not incur any loss. --bill

The MHD profile is a 'profile' of FHIR to meet the XDS use-cases. Therefore it will constrain the use of FHIR to only those use-cases and support of XDS. Therefore any 'extra' stuff that is not explicitly included in the MHD specification can/should/shall be ignored or cause an error. I would suggest we recommend failure, allowing success. --John

Queries

ITI-18 queries fall into two categories when viewed through FHIR: single return type and multiple return type. Single return type queries are those that return only a single object type. Examples are FindDocuments (returns only DocumentEntries) , FindSubmissionSets (return only SubmissionSets), GetDocuments (returns only DocumentEntries). Multiple return type queries are those that return a mixture of different object types. Examples are GetSubmissionSetAndContents (returns SubmissionSet, DocumentEntry, Folder, and Association types). Basic FHIR queries are defined on a resource type like DocumentReference. So a query anchored by DocumentReference only returns DocumentReferences. These single return type queries are defined on REST as HTTP GET. For multiple return type queries we must use a different FHIR mechanism called messages which has a more complicated style coding. We could define all queries on messages but then the value of simplicity of HTTP GET is lost.

I recommend that for MHD we only try to support FindDocuments and FindSubmissionSets. This is what Volume 1 has already scoped. This doesn't mean that the other stored queries can't be supported, but it is not clear the urgency of them. Note that FHIR can handle multiple type returns fine, as each resource is self-describing. -- John

Useful links into the HL7 FHIR specification

• The root http://hl7.org/fhir
• This is the library of all currently defined ‘resources’ http://hl7.org/implement/standards/fhir/resourcelist.html
  • Specific to PDQm but will also be used in MHD
    • Patient
    • RelatedPerson
  • Specific to MHD
    • DocumentReference
    • DocumentManifest
    • Provenance
    • List
• Here is the “Profile” that Grahame did inside of FHIR of how FHIR can map to XDS
• Note also specific to a future effort on ATNA
  • SecurityEvent