Hello: I have recently switched from my Animas Ping to a Tandem Tslim. There is a lot to like about the pump but I have a few questions for current Tandem users.
For one, I have noticed that it seems to waste more insulin than my previous pump. When I fill a cartridge I am using a syringe with 150 units. However, several times my pump will give me a reading of about 80 or 85 units. I realize that I have to account for the priming (13.5 units for my contact detach true steel infusion set), plus the pump does not give a number until you have used 10 units and yes, there is supposedly about 20 units that is not used, a reservoir of sorts. Even with these factors, that means there are still about 30 units unaccounted for. Moreover, I feel like the pump stops bring effective by the time I have 10 units left or in some cases only 15 or 16 units. With my Animas, I regularly used all the insulin in my cartridge. Bottom line, with the Tandem I am flying through my insulin supply.
AS for insulin, I was initially using FIASP and like many of you, I have had some issues so I am now trying Humalog. With both of these insulins I have experienced this gap in what the pump measures versus what I have actually put in. I am also careful to make sure my insulin is room temp before filling a syringe and cartridge (this is a point the Tandem rep reiterated several times).
Secondly, I wanted to ask people about their experience of extracting air from the Tandem cartridges. At present, I follow the instructions provided by the manufacturer. My question is how does one know if all the air is out? I always feel like I can pull out additional air bubbles even when my plunger is fully extracted. Is it possible to pull out too much air or damage the bag?
I hope to return to FIASP (or some mixture of it) but I will save that discussion for a different post. Humalog (and Novalog) is just too slow for me.
Thanks for your insight.