OUTCOME:  8-0-1 done 12/4/4

From: owner-mnm@lists.hl7.org on behalf of Julie James 
[Julie_James@BlueWaveInformatics.co.uk]
Sent: Friday, November 12, 2004 5:05 AM
To: pharmacy@lists.hl7.org; 'MNM listserv'
Cc: 'Bishop Charlie'; 'Hugh_Glover'; 'Charlie McCay'; 'David Markwell'
Subject: Variable Doses - Data Type proposal

Attachments: footer.txt; Dose Calculation.doc

HI 
We discussed the proposition of data type extension for managing mg/kg type 
dosage expression at the HL7 UK TC meeting.
HL7 UK seemed happy to stick with the derivation.Expr way of doing things, on 
the grounds that everyone was going to have to get to grips with an OCL at some 
stage (maybe GELLO) and that putting structure into xml was possibly less 
valuable than working with OCL, in the long run.  I think this was the crux of 
the debate, anyway  it was very much at the limits of my range of skills.. 
Although I presented it pretty much as in Gunthers e-mail, and even though folk 
kept saying no, thats not right actually, when we dug, we decided yes, it is 
because., all to do with the relationship between the meaning of 
derivation.Expr and the mood of the act and the related observation, and how it 
all hangs together
We did feel the RIM definition for derivation.Expr was a little ambiguous, as 
there were folk who thought this attribute specifically should be used to 
describe how a stated value has been calculated when there are more than one 
way, whereas the actual definition allows for the interpretation we are 
thinking of for SBADM dosing but it would be good to have it stated that the 
derivation.Expr can be used to give calculation information to be used to reach 
a value as well as to show how a value was reached.
Definition: A character string containing a formal language expression that 
specifies how the Act's attributes are derived from input parameters associated 
with derivation relationships. 
Possibly..
Definition: A character string containing a formal language expression that 
specifies how the Act's attributes are (should be/have been) derived from input 
parameters associated with derivation relationships. 
 
I dont feel that there is consensus on how to do variable doses, but I do need 
to get somewhere more concrete quickly, please.. and its not something I have 
enough expertise in to know what is best..so, please, those of you who do..
Maybe this should be copied to folk on data type lists  wherever they may 
be
Ive copied this to MnM as a start, with the attachment of my summary of 
Gunthers original proposal, which is what I presented to HL7 UK
I look forward to the discussion, even if there are bits I cannot follow
 
Best wishes
Julie
 
Julie M James MRPharmS
Blue Wave Informatics LLP
91a Queen Street
EXETER
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julie_james@bluewaveinformatics.co.uk
+44 (0)7747 633216
+44 (0)1392 271274
 