Hi all,
After a thread on the openehr-clinical list about associated symptoms
(cf. subject "Associated symptoms" on openehr-clinical) some technical
questions about computation of time came to my mind.
In openEHR the time data can be found in different places in different
ENTRY types.
OBSERVATIONs have HISTORYs for attributes "data" and "state". Time data
in HISTORY represent the timing of observations, they may be used for
computations. Time data in the ITEM_STRUCTURE of the attribute "data" of
an EVENT in a HISTORY should not be used for computation.
An example for the latter is archetype
openEHR-EHR-OBSERVATION.symptom_check.v1 which includes CLUSTER
archetype openEHR-EHR-CLUSTER.symptom.v3.adl.
openEHR-EHR-CLUSTER.symptom.v3.adl defines time data at archetype node
at0063 "Date / time of onset". This time data should not be used for
computation to avoid contradiction with time data recorded in the
HISTORY of the OBSERVATION.
Is this right?
EVALUATIONs have time data somewhere in the ITEM_STRUCTURE of their
attribute "data". This time data may be used for computation.
For example archetype openEHR-EHR-EVALUATION.problem-diagnosis.v1
defines time data at archetype node at0003 "Date of initial onset" which
may be used for computation.
Is this right?
ACTIONs have time data in attribute "time" which states when the action
completed and in the ITEM_STRUCTURE of the attribute "description". Both
time data may be used for computation.
An example for the latter is archetype openEHR-EHR-ACTION.medication.v1
which includes archetype openEHR-EHR-ITEM_TREE.medication.v1.
openEHR-EHR-ITEM_TREE.medication.v1 defines time data at archetype node
at0019 "Date (time) of first administration". This time data may be used
for computation.
Is this right?
What about archetype node at0032 "Date (time) of last administration" of
openEHR-EHR-ITEM_TREE.medication.v1? Does it contradict time data in
attribute "time" in ACTIONs?
INSTRUCTIONs have time data in "expiry_time" and in the ITEM_STRUCTURE
of the attribute "description". Both time data may be used for
computation.
An example for the latter is archetype
openEHR-EHR-INSTRUCTION.medication.v1 which includes archetype
openEHR-EHR-ITEM_TREE.medication.v1. openEHR-EHR-ITEM_TREE.medication.v1
defines time data at archetype node at0019 "Date (time) of first
administration". This time data may be used for computation.
Is this right?
Here archetype node at0032 "Date (time) of last administration" of
openEHR-EHR-ITEM_TREE.medication.v1 could also contradict the attribute
"expiry_time" of INSTRUCTIONs, but the semantics of these time data is
quite different, thus this should not be a problem, right?
Any comments really welcome.
Cheers,
Bruno
--
Bruno Cadonna
Database and Information Systems (DIS)
Faculty of Computer Science
Free University of Bozen-Bolzano
Piazza Domenicani 3
39100 Bozen/Bolzano
Italy
web: http://www.inf.unibz.it/dis
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