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Re: [IP] Re: pump calculations

I don't know how they factor in those variables. But it seems that it
wouldn't be different from regular basals and boluses in that regard. Those
variables aren't factored in automatically there either.

BTW, I almost didn't read your post because you had changed the subject, and
I'm not able to read all the messages that are posted.



----- Original Message ----- 
From: "probent" <email @ redacted>
To: <email @ redacted>
Sent: Sunday, September 07, 2003 1:23 PM
Subject: [IP] Re: pump calculations

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>     Neil, I don't see how straight line or non-straight line calculations
> can practically ignore the variables of physical activity and site
> If someone has information that shows that location and activity are
> relatively not important then the two-line- comparison question is
> reasonable. However,I don't think that I have a very odd type of DM and
> location and activity are by far the major factors that determine my
> residual insulin levels. While it certainly is a very interesting question
> it maybe leading people away from two more significant variables--location
> and activity.
>     If in your second paragraph you mean 'insulin activity' to mean
> or strength ,then it seems to be different from the residuals variable or
> how long does the insulin float around.
>     Doesn't it seem reasonable that the people who developed this
> approximation feature would have though of all of these variables?
> it be helpful to have access to these internal discussions? I wonder if
> companies want it this way or we on the outside just haven't found the
> keys.            Peter
> ----------
> >From: email @ redacted (insulin-pumpers-digest)
> >To: email @ redacted
> > Date: Sat, 6 Sep 2003 22:15:57 -0500
> > From: "Neil Ginsberg" <email @ redacted>
> > Subject: [IP] Insulin On Board Methods
> >
> > The Minimed 512 and the Deltec Cozmo both calculate "insulin on board"
> > suggesting adjustments, so as not to stack insulin. The Minimed uses a
> > that approximates insulin activity based on manufacturer data (90% of
> > insulin activity left after one hour, 65% left after two hours, 43%
> > three hours, and 24% of the activity working between hours four and
> > whereas the Cozmo uses a straight line from zero hours to the number of
>  > the user specifies (if the user specifies four hours, then 75% after
> hour,
> > 50% after two hours, 25% after three hours, and 0% after four hours).
> >
> > At first glance it seems that the Minimed method is superior, since it
> > approximates actual insulin activity, rather than a straight line. But
is it
> > really? When calculating "insulin on board" does one really want to
> > insulin _activity_ or insulin that is _unabsorbed_ (or ar they the same
> > thing)? That is, even if the insulin activity doesn't follow a straight
> > perhaps the insulin absorption does, and, therefore, perhaps the Cozmo
> > is superior for calculating "insulin on board."
> >
> > I'd be interested in hearing people's opinions about this, as I think
it's a
> > significant issue.
> >
> > Thanks!
> >
> > Neil
> > - ----------------------------------------------------------
> ----------------------------------------------------------
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