SNOMED CT's Condition / Situation approach related to OGMS Stefan Schulz Medical University of Graz (Austria) ICBO 2013 Montreal OGMS Meeting.

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Presentation transcript:

SNOMED CT's Condition / Situation approach related to OGMS Stefan Schulz Medical University of Graz (Austria) ICBO 2013 Montreal OGMS Meeting

What are SNOMED CT findings and disorders – ontologically ? Finding Disorder

Background Awareness of heterogeneity of the SNOMED CT hierarchies "finding", "disorder", "event": addressed by the IHTSDO SIG "Event – Condition – Episode" (ECE), after meeting with Barry Smith on October 2009 Need for "common ontology" between future ICD 11 and SNOMED CT: joint advisory group IHTSDO + WHO

Example

From findings to conditions ECE, after discussion of OGMS (2009): Interpretation of SNOMED codes under "finding" (including "disorder") as "condition" Publication: Scalable representations of diseases in biomedical ontologies. Schulz S, Spackman K, James A, Cocos C, Boeker M. J Biomed Semantics. 2011

"Clinical condition" (I) Current SNOMED finding classes are ambigous Physicians (often) have no problem with this ambiguity 'Clinical condition' equivalentTo 'clinical disposition' or 'clinical structure' or 'clinical process'

"Clinical condition" (II) Disambiguation according to needs: Allergic disposition vs. allergic reaction – Allergy and Disposition – Allergy and Process Allergy and inheresIn X  classified as Disposition (ogms:Disease) Allergy and hasParticipant X  classified as Process (ogms:Disease course)

Problem not solved (I) Naming suggest clear commitment, which creates category conflicts between parents and children: Blood vessel finding (finding) Distention of blood vessel (finding) Distention of vein (finding) Varicose vein finding (finding) Venous varices (disorder)

Problem not solved (II) Fracture of Ulna Fracture of Radius Fracture of Radius and Ulna Multiple parenthood difficult to interpret

Is this True? FALSE, if X means “pathological condition” TRUE, if X means “situation with X” or “patient having X”

Example 2

F PPPP FF P F PP Extension of “Situation with Pulmonic Valve Stenosis” includes extension of “Situation with Tetralogy of Fallot”: TRUE

Two diverging interpretations of finding / disorder terms in SNOMED CT and ICD: They denote patient-borne Conditions such as body processes, states, dispositions, or (patho-) anatomical structures, which are reportable in the context of medical records They denote Clinical Situations, which are defined as phases of a patient’s life, during which he/she is bearer of (some combination of) pathological conditions. Only the situation interpretation is compatible with the current state of SNOMED CT (multiple taxonomies, "A with B" concepts, role groups) Low inter-modeller agreement when trying to partition SNOMED CT findings into conditions and situations (Stefan Schulz, Alan Rector, Jean-Marie Rodrigues, Kent Spackman. Competing Interpretations of Disorder Codes in SNOMED CT and ICD AMIA Annu Symp Proc. 2012; 2012: 819–827)

Situations, conditions and role groups

Situation hasCondition

The Ontology of Clinical Situations Andrade, Martínez-Costa, Spackman, Almeida, Schulz Currently under review (Applied ontology)