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Cannula stops working during use?

Discussion in 'Insulin Pump Forum' started by claire mccann, Dec 8, 2017.

  1. claire mccann

    claire mccann Type 1 · Active Member

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    Hi I wasn’t sure if anyone else had this problem-a few days into use the cannula seems to stop absorbing the insulin into me or at least decreases absorption rate significantly? I notice because I need 3*as much insulin but then when i take it out it all seems fine and insulin flows normally?

    I use medtronic 640g and minimed mio cannulas

    Thanks
    Claire
     
  2. bobcurly

    bobcurly Type 1 · Well-Known Member

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    Yep all the time. Drove us all mad. Will only use sure t now. Needs a change every 2 days but i know it will work 100% of time
     
  3. catapillar

    catapillar Type 1 · Well-Known Member

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  4. claire mccann

    claire mccann Type 1 · Active Member

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    I have gone as many as 6 days with a cannula but I do usually change after 4 days - I don’t have another need to change sooner unless it’s to adhere to medtronic guidance which cynically I suspect is due to the companies wanting regular purchase rather than a genuine need (suppose it’s a bit like lancets)
     
  5. Snapsy

    Snapsy Type 1 · Well-Known Member

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    @claire mccann it is perhaps for the reason you describe in your original post that Medtronic recommends changing every 2-3 days. It sounds as if you do have a need to change sooner than the 4-6 days you're changing them.
    :)
     
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  6. Neoncat

    Neoncat Type 1 · Well-Known Member

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    When I was getting set up with my pump my DSN drove home that I had to change my canula every 3 days. The main reason being that your body will start to heal around the canula and so the insulin adsorption will drop dramatically. I have left my canula in for 4 days a couple of times when I was camping and it was a bit awkward to try and change it, and I did see a big unexpected increase in my blood glucose. So now I am strict about it!
     
  7. dancer

    dancer Type 1 · Well-Known Member

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    I have to change my set every 2 days. If I waited 3 days, my blood sugar would be high during the 3rd day.
     
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  8. catapillar

    catapillar Type 1 · Well-Known Member

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    I think your experience with having problems with insulin delivery when using the cannulas for longer than they are advised to be used might prove your cynicism about the guidance wrong - and on an economic view the I don't really think it makes a lot of difference profit wise to Medtronic whether the cannulas are used for 2-3 days or 6-7, they aren't high cost items. It shouldn't really be a suprise that sites that are being used for twice the time period they are supposed to be used for don't work as effectively. Using your sites for longer than the advised period increases your risk of infection and lipohypertrophy. When I was using Medtronic I would leave my sites in for much longer than 3 days purely out of laziness, I very rarely noticed any issues with effectiveness of insulin delivery/absorption, but when I did I definitely made sure to change my site.
     
  9. leahkian

    leahkian · Well-Known Member

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    I was a medtronic pump user and was told by the DNS and the medtronic nurse of changing sites every 2-3 days as the longer you leave it the more chance of a build up of insulin which if you run your fingers over you can feel a lump. They also told me to have 3-4 sites so you are not putting it in the same area and if the build up of insulin stops all the insulin going in the pumps should alarm or it has been known to come out on to the skin so you think you have had your dose but you have not had the full amount. I am sure if you change your sites every 2-3 days it will help and it is still better that having at least 4 injections a day.
     
  10. claire mccann

    claire mccann Type 1 · Active Member

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    Thank you all-I hasn’t realised the piece about cannula stopping working-I’ll change it sooner now. Just need to work out the impact of colder air and Pump being more exposed to it than say insulin in handbag and impact on dose (I generally only have about 30-35 units max a day) to be completely sorted!

    Thank you all
     
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  11. MushyPeaBrain

    MushyPeaBrain Type 1 · Well-Known Member

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    I was told the changing sites every 2-3 days came after years of American pump users ending up with scar tissue because they were leaving sets in much longer. I can go 4 days without issue and very occasionally I do for something such as feeling too ill to change or unexpected events that make doing a change awkward. Otherwise I change every 3 without fail and sooner if a site feels sore.
     
  12. iHs

    iHs · Well-Known Member

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    1. So what sets are you now using because in the past you had absorbtion issues?
     
  13. MushyPeaBrain

    MushyPeaBrain Type 1 · Well-Known Member

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    I'm still using Inset II 6mm but I don;t use my stomach at all and I also gained weight which made a huge difference. I didn't plan to gain the weight and if I ever slim down a bit I might find the absorption problems come back but for now it's all good.
     
  14. evelyn18

    evelyn18 · Newbie

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    I have had diabetes for 15 years ( since i was 2) now pump user for 7 never had a problem with cannulas but the last three weeks i have had to change almost everyday sometimes 3-4 times until one works as they are filling with blood every time , anyone know any reason why this may be happening? (yes i regularly change my sites and sites which are usually fine no longer are and are now causing me extreme pain affecting day to day life).
     
  15. Goonergal

    Goonergal Type 2 · Moderator
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    Hi @evelyn18 and welcome

    I can’t help with your question as I don’t use insulin, however I wanted to welcome you and also mention that you’ve posted on a 2 year old thread. You’d likely get more response if you open a new thread with your question.
     
  16. Juicyj

    Juicyj Type 1 · Moderator
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    Hi @evelyn18 As mentioned already it would be a good idea to move your query to a new thread.

    What are your blood glucose levels like when this is happening ?
     
  17. Helen46

    Helen46 · Active Member

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    I get this in the last 6-8 hours before I change the infusion set. Dr's advice was that the site deteriorates to some degree. Options are to change it more frequently or just increase the basal/correction doses etc. BUT as I also take additional time for the new infusion set to bed in I prefer to cope with the extra need for insulin prior to changing set. In effect I get really good readings for about two days and the rest of the time I am making adjustments but not changing my basal rates over that time. It's a never ending story... At least there is now some acknowledgement that this happens. When I first complained it was insinuated that it was operator error and I must have been inserting then incorrectly. Now generally accepted.
     
  18. dancer

    dancer Type 1 · Well-Known Member

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    If the cannula works well for 2 days, why not change it every 2 days instead of every 3? Medtronic does say to change cannulas every 2 or 3 days.
     
  19. Helen46

    Helen46 · Active Member

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  20. dancer

    dancer Type 1 · Well-Known Member

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    @Helen46 have you tried using an increased temporary basal when you change a set? I use a decreased temp basal for 2 hours after changing sets which prevents me going hypo (I am insulin sensitive). I have read on the forum that some pump users require an increased basal to prevent hypers after a set change.
     
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