Thomas, OpenEHR and 13606 deal with Closed World Assumption systems. And therefor both mean in the case of 'No Cancer' that Cancer was not found in the database or that No Cancer was the documented result of an evaluation. Both statements are documented things in a Template that according to the author cancer is not found. But any time in the future it might.
'No Cancer' as pre-coordinated term in the case of SNOMED means that no cancer was, is, or will be present. Gerard Freriks +31 620347088 [email protected] Kattensingel 20 2801 CA Gouda the Netherlands > On 1 Apr 2018, at 14:41, Thomas Beale <[email protected]> wrote: > > > On 01/04/2018 13:16, GF wrote: >> Pre-coordinated SNOMED codes are like classifications, in that they are used >> at the user level, the User Interface, >> The Ontology behind SNOMED allows the pre-ordinated codes to be decomposed >> in its constituents. >> These decomposed primitive codes can be used in structures like archetypes >> at the proper places. >> In this way the pre-coorodinated SNOMED codes are iso-semantic. >> >> But we keep the semantic differences codes expressed using the SNOMED >> ontology and the Archetype and its codes. >> Ontologies have the Open World Assumption. A pre-corodinated code like: >> No-Cancer means never there was, is or will be cancer. Ontologies describe >> reality. >> In archetypes that use the Closed World Assumption Diagnosis=cancer, >> PresenceModifier=No means No Cancer found but perhaps they are. It just was >> not found. Presence of absence in a database are described. > > I'm unclear why you call this a use of the closed world assumption: the > entire openEHR framework is for building HISs that enable reporting of > reality as it is known to those working in it. So if they put 'No cancer' > that just means that the current clinical thinking for some patient, with > respect to some investigation, is that the original presenting problem is not > cancer. > > That never means that the patient doesn't have cancer in their body > somewhere, it just means that the currently investigated signs and symptoms > don't relate to cancer, according to the the investigation carried out. Even > that can be overturned later. But everyone assumes this - the EHR is always > understood as an 'open world' system, where absence of X doesn't mean > negation of X, it just means that no-one has investigated X. > > - thomas > _______________________________________________ > openEHR-technical mailing list > [email protected] > http://lists.openehr.org/mailman/listinfo/openehr-technical_lists.openehr.org
signature.asc
Description: Message signed with OpenPGP
_______________________________________________ openEHR-technical mailing list [email protected] http://lists.openehr.org/mailman/listinfo/openehr-technical_lists.openehr.org
