Device observables
These concepts have been requested from the NHS, there is already quite a bit of existing content under 364697006|Equipment observable (observable entity).
We would like feedback from this group about what a minimal set of properties would be required to make these unambiguous in use.
Hemodialysis machine stroke volume (observable entity) |
Hemodialysis pump head segment (observable entity) |
Hemodialysis priming volume (observable entity) |
Hemodialysis blood circuit connection (observable entity) |
Hemodialysis anticoagulant infusion rate (observable entity) |
Hemodialysis ultrafiltration volume (observable entity) |
Ultrafiltration rate setting on hemodialysis machine (observable entity) |
Hemodialysis pump speed (observable entity) |
Bicarbonate level setting on hemodialysis machine (observable entity) |
Hemodialysis extracorporeal circuit volume (observable entity) |
Hemodialysis blood flow rate (observable entity) |
Trackers:
https://projects.jira.snomed.org/browse/IHTSDO-308
https://projects.jira.snomed.org/browse/IHTSDO-1067 - has an attached document
https://projects.jira.snomed.org/browse/PCP-85
https://projects.jira.snomed.org/browse/PCP-80
Comments
Today I have reached out for example values for these observables.
Slides from previous discussions: https://docs.google.com/presentation/d/1m6g6X4yZXItsJQdTkA5tesb_WOf16z1JvzqRRQy1Iu4/edit?usp=drivesdk
Daniel noted in an email:
We did some work on device settings some time ago but never concluded since no one did implement the results.
In general, the same model can be used for observables and “settables” but some way of separating the two is needed, perhaps a common primitive for the “settable” observables.
One challenge was that while it is a setting on a machine (or in software most probably…) it is also a “setting” of a procedure using the device. The stroke volume of the dialyzer is part of the “setting” of the hemodialysis procedure, where other “settings” might be e.g. duration of treatment which isn’t (necessarily) a setting on the machine itself. There are a few other similar observables, like all the “target…” observables. So, we need to decide whether there is a device observable (or ”settable”) separate from the procedure observable/settable. Also, there are “things” which might be both settable and measurable, which need to be separate concepts.
Looking through the examples I have some questions:
Do you have example values for the observable? I do understand what the stroke volume is (or so I believe) but this is the heart stroking not the machine (hemodialyzers typically have a continuous flow), is it? I also think I know what the pump (head) segment is, but what is observed about that piece of tube? So, to me it seems these are not all settings, but that some are observations that happen to happen during hemodialysis. Is this correct?