Thanks for your clear explanation but it doesn't provide the clue I'm looking for. Since I lack a most of the technical background I can only approach it from a clinical point of view.
My question is: Where/how do I register the data and time of an event that took place. So let's say that at this moment (May 18 2007 @10hrs10min) I want to register an event that took place last night (May 17 2007 @23hrs53min). How/where in the AT can I create a data entry field for this (if that's necessary at all) and how would this look like in a data entry template html page Op 17-mei-2007, om 3:18 heeft Andrew Patterson het volgende geschreven: >> I need some help in understanding the concept 'point in time'. As far >> as I understand it now the completion date/time of an event (f.i. a >> blood pressure measurement) is registered as a point in time in the >> event section of the archetype. > > yes, that's my understanding as well. > >> Thing is that I expected to find an entry field where I can enter >> that particular date and time. In the EHR_IM I found the Action >> class (p.71) which purpose seems to be to capture/record those points >> in time, is I figured that's the place to be. > > well, there is a 'time' field in Action which is where you would > record > the time of an action. But blood pressure is an observation, and > unlike Action, all observations are modeled as a HISTORY of events. > > So in OBSERVATION, we find a HISTORY that has an 'origin' > time and also contains a set of time EVENT's. > > Each EVENT also has a 'time' field (with some restrictions on how > it relates to 'origin' in the containing HISTORY). > > However, you will rarely find any reference to one of these fields in > an ADL document because these fields are generally unconstrained > (i.e you > wouldn't write an archetype that said the blood pressure had to be > measured at 03-06-2007). You will find that the 'offset' field is > often used - > this is defined as the difference in time between the EVENT and the > base time in the HISTORY. It can be used to model EVENT's that > must occur at set times after the 'origin' of the HISTORY (apgar etc). > > INTERVAL_EVENT can be used to record fancy averages over time > etc. > > (I don't write archetypes so take this with a grain of salt! It's my > understanding > from a technical background, not a clinical background) > > Andrew > _______________________________________________ > openEHR-clinical mailing list > openEHR-clinical at openehr.org > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-clinical
