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Fiasp active insulin time for a pump

Natalie123

Natalie123

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Hi all, Anyone else use Fiasp in a pump? I wondered what active insulin time people used for it?

I know the stated active insulin time is something like 5 hours but I was told that, in a pump, it would need to be set somewhere in the range 2 - 3.5 hours but it would be trial and error like everything else. I had it on 2.5 hours but the pump didn't seem to be responding very quickly to highs so I changed it to 2 hours but now it's giving me too much correction! I'm thinking I should put it back to 2.5 hours. Or I could change my correction factor. Why is this so complicated?!
 
Just checked my settings, mine in the Omnipod 5 is set at 3.5 hours
 
My active insulin time for Fiasp is set for 3 hours.
The problem of pump not responding very quickly to highs maybe a "feature" of Fiasp rather than your pump.
I find that it can appear to behave like water when my BG is in double figures and then, suddenly, after an hour my BG plummets if I was not patient and stacked my corrections. Plus you have the common symptom of insulin resistance when our BG is high so I find I may need 1.5 times as much insulin for high corrections.

I find Fiasp speed is very dependent upon my current BG.
- If my BY is in the 4s, I need to bolus after eating
- If my BG is between 5 to 8, I bolus just before eating
- If my BG is between 8 and about 12, I need to pre-bolus 15 to 30 minutes before eating
- If my BG is above 12, I correct and wait for it to come down before thinking about eating
 
Thanks @PhoebeC and @helli looks like I might have to extend it a bit.
 
helli said:
The problem of pump not responding very quickly to highs maybe a "feature" of Fiasp rather than your pump.
I find that it can appear to behave like water when my BG is in double figures and then, suddenly, after an hour my BG plummets if I was not patient and stacked my corrections. Plus you have the common symptom of insulin resistance when our BG is high so I find I may need 1.5 times as much insulin for high corrections.
Click to expand...
Exactly this! If only there was a way to tell the pump this!
I do find Fiasp meets my needs better around meal times than the slower fast acting insulins though so I shouldn't complain too much.
 
Last edited:
Natalie123 said:
Hi all, Anyone else use Fiasp in a pump? I wondered what active insulin time people used for it?

I know the stated active insulin time is something like 5 hours but I was told that, in a pump, it would need to be set somewhere in the range 2 - 3.5 hours but it would be trial and error like everything else. I had it on 2.5 hours but the pump didn't seem to be responding very quickly to highs so I changed it to 2 hours but now it's giving me too much correction! I'm thinking I should put it back to 2.5 hours. Or I could change my correction factor. Why is this so complicated?!
Click to expand...
people quite often confuse duration of insulin and peak of insulin. Duration for Fiasp is 5hours.
 
Pumper_Sue said:
people quite often confuse duration of insulin and peak of insulin. Duration for Fiasp is 5hours.
Click to expand...
Thanks Sue, according to the pump rep and my diabetes team, if you're using Fiasp in an HCL system, the active insulin time needs to be set much shorter than the actual active insulin time! Just to confuse us all! I assume it's because the amount left after 3 hours is very low but I don't know why they didn't take this into account unless Fiasp behaves differently to the usual Novo Rapid that the algorithm is probably based on.
 
Natalie123 said:
Thanks Sue, according to the pump rep and my diabetes team, if you're using Fiasp in an HCL system, the active insulin time needs to be set much shorter than the actual active insulin time! Just to confuse us all! I assume it's because the amount left after 3 hours is very low but I don't know why they didn't take this into account unless Fiasp behaves differently to the usual Novo Rapid that the algorithm is probably based on.
Click to expand...
Fiasp does have a kick in it after about 4.5 hours so do be warned.
I use fiasp in my pump but not a closed loop system as do not consider the sensors accurate enough to trust..
 
Pumper_Sue said:
Fiasp does have a kick in it after about 4.5 hours so do be warned.
I use fiasp in my pump but not a closed loop system as do not consider the sensors accurate enough to trust..
Click to expand...
Interesting as I find Fiasp doesn't have any noticeable activity at all after 3 hours.
We are all different so I don't think you can say anything is set in stone and we will all have different experiences and we need to discover how our particular body responds to any particular insulin or situation that we use it in. Of course reading of other people's experiences can help to prepare us for what might happen.
 
Pumper_Sue said:
Fiasp does have a kick in it after about 4.5 hours so do be warned.
I use fiasp in my pump but not a closed loop system as do not consider the sensors accurate enough to trust..
Click to expand...
Interesting. I wonder if something similar is happening for me. I'll keep an eye out now that I know it's a possibility! Thanks
 
I did use Fiasp MDI and only find it effective upto 2 hours. With Novorapid that could suddenly work after 3-4 hours of stubborn highs, with Fiasp once that 2 hour window has gone I find that is has little impact. Again we are all different.

I move over to Fiasp before I went onto the pump and found it much better for me that NR.

I will see what my DSN thinks about dropping the setting in my pump, it is not active for 3.5 for me so might drop this down.
 
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