# Artorius - Re: [IP] Silhouette users

```I'm glad that I wasn't the only one who took some time to understand this.....

Actually, the only thing that does change is the priming. When pumping U50, the
pump does the calculation for how much volume vs how much actual insulin.  U50 is
50% insulin 50% dilutent.  When you tell the pump to give, lets say, 2 units, it
actually gives 4 units of volume, 2 units of insulin, 2 units of dilutent.  So,
when I told the pump to prime 0.40 units, it actually gave 0.80 units of volume.
That would have been my logical choice to prime, but our manual said to prime 1
unit.  That's what I did.  When using U100, the actual insulin and volume are the
same.  No dilutent.

I hope that I didn't confuse things even more.  It took me a while to wrap my
brain around the fact that the pump did the calculations and all I had to do when
pumping U50 was tell the pump how many units of insulin we wanted and it did the
calculating.

Susan

Artorius Rex wrote:

> This could just be my brain getting in the way, but....
>
> Priming the canula should be consistent regardless of the strength of the
> insulin being pumped into it.   The canula will always hold the same volume of
> liquid.   If it required .4 with U50 insulin, it will still only take .4 of
> U100 insulin to fill the canula.
>
> Calculating units to deliver for bolus/basal/correction adjustments are all
> that should change when insulin strength changes.
>
> --- Nancy Leach <email @ redacted> wrote:
> > We prime the canula on the silhouette 0.7.  That is according to the user
> > guide from minimed.
> > Nancy
> > ----- Original Message -----
> > From: "Susan Borkowsky" <email @ redacted>
> > To: "Pumpers List" <email @ redacted>; "Parents of Pumpers"
> > <email @ redacted>
> > Sent: Friday, August 02, 2002 1:21 PM
> > Subject: [IP] Silhouette users
> >
> >
> > > Hi.  I'm about to switch Jon to NovoRapid (Novolog) from Lispro
> > > (Humalog) and I have a question for those of you using the Silhouette
> > > infusions.
> > >
> > > How much do you prime the canula?
> > >
> > > We've been pumping diluted insulin since day 1 (U50) and now are going
> > > to be pumping full strength (U100).  When pumping U50 we primed the
> > > canula .40 units.  The pump did the rest of the calculation so we never
> > > had to worry about volume vs. acutual units of insulin, now we do.
> > > Well, now we don't really, except for the prime.  Prime is actual volume
> > > where as before, we only worried about units and the pump always did the
> > > calculation.  Now, it is full strength and the manual says to prime 1
> > > unit, which is more than double the volume of .40 units.  (are you still
> > > with me?)
> > >
> > > My question?
> > >
> > > How much is everyone priming their Silhouette canula's at U100 strength?
> > >
> > > Thanks,
> > >
> > > Susan
> > > Mom to Julianna - 17, Danny - 15, Katrina - 11, Jonathan - 5, dx 08/00,
> > > pumping since 03/02, and Nicholas - 3
> > >
> > > [demime 0.98e removed an attachment of type text/x-vcard which had a name
> > of borkowsk.vcf]
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