Gary_W
04-20-2008, 02:37 PM
Hello all,
Please indulge me whilst I dig up the horse that died already and try to thrash some sense into it in the vain hope it will live.
I've attached the tables for the Insulin on Board feature on the Animas 2020 (at least I've tried, not attached here before so here goes nothing...).
For those not in the know, you can tell this pump how long you think your insulin lasts for and then the pump will work out 'bolus on board' data for you which you can take into account in your future bolus deliveries. The manual claims that this is done on an analogue curve to match modern insulins. Which is delightful, but as we all have different bodies and we could be using Apidra, Humalog, Novorapid or (in some cases) something else from the animal kingdom, it would be really nice to know HOW it's working it out. In that way, you can set the number in the pump to YOUR curve and have a little bit more confidence in it getting the maths right :cool:
How did I get the data? Well, I had a loan pump for a 3 week period prior to being hooked up. I experimented with it so I'd get used to the menus etc. I decided to put in a 4 hour IoB duration and then do a 10u bolus. I then noted down how much IoB the pump had left at 15 minute intervals. It's not 100% accurate, as I used kitchen timer alarm so some of these might have been at 15 min 30 seconds etc but as a table I think it's reasonably accurate so please keep that disclaimer in mind :)
After I'd done these two settings, I was fairly confident that I'd found a curve that would match Apidra. I decided that there may be others out there as sad as me, hence doing the numbers from 3 hours through to 5. I had neither the time nor patience to do any more, and as I'm now hooked up I can't repeat the experiment in the same manner. I love the pump too much to disconnect for 5 hours and do MDI; I'm not that much into science to suffer for it...
Please see the other discussion thread on IoB that I started as well; it is important to realise what the pump DOES with this IoB value once it has it. The discussion in that thread is ongoing, and it's worth a read as what it does with IoB may differ from what you believed if your brain works like mine does / did. The thread is here
http://www.diabetesforums.com/forum/pumping-insulin/27772-animas-2020-iob-question.html
Any questions, let me know. I hope someone finds it useful :)
Gary
Please indulge me whilst I dig up the horse that died already and try to thrash some sense into it in the vain hope it will live.
I've attached the tables for the Insulin on Board feature on the Animas 2020 (at least I've tried, not attached here before so here goes nothing...).
For those not in the know, you can tell this pump how long you think your insulin lasts for and then the pump will work out 'bolus on board' data for you which you can take into account in your future bolus deliveries. The manual claims that this is done on an analogue curve to match modern insulins. Which is delightful, but as we all have different bodies and we could be using Apidra, Humalog, Novorapid or (in some cases) something else from the animal kingdom, it would be really nice to know HOW it's working it out. In that way, you can set the number in the pump to YOUR curve and have a little bit more confidence in it getting the maths right :cool:
How did I get the data? Well, I had a loan pump for a 3 week period prior to being hooked up. I experimented with it so I'd get used to the menus etc. I decided to put in a 4 hour IoB duration and then do a 10u bolus. I then noted down how much IoB the pump had left at 15 minute intervals. It's not 100% accurate, as I used kitchen timer alarm so some of these might have been at 15 min 30 seconds etc but as a table I think it's reasonably accurate so please keep that disclaimer in mind :)
After I'd done these two settings, I was fairly confident that I'd found a curve that would match Apidra. I decided that there may be others out there as sad as me, hence doing the numbers from 3 hours through to 5. I had neither the time nor patience to do any more, and as I'm now hooked up I can't repeat the experiment in the same manner. I love the pump too much to disconnect for 5 hours and do MDI; I'm not that much into science to suffer for it...
Please see the other discussion thread on IoB that I started as well; it is important to realise what the pump DOES with this IoB value once it has it. The discussion in that thread is ongoing, and it's worth a read as what it does with IoB may differ from what you believed if your brain works like mine does / did. The thread is here
http://www.diabetesforums.com/forum/pumping-insulin/27772-animas-2020-iob-question.html
Any questions, let me know. I hope someone finds it useful :)
Gary