[Neff]

My wife is T1D and she is really scared about the idea of moving to a closed loop system with a pump, but her endo is constantly pushing her towards it even though she is keeping her A1C at like ~6% with her Dexcom CGM.

The concern is the the G7 CGM seems to have times where it is so wildly off with readings that a closed loop system could kill her. This weekend the CGM was saying she was all the sudden at 40, but she was at about 115. I am scared to think what would happen in the night if the closed loop system thought it needed to raise her blood sugar... Logically I know it wouldnt raise it to a point that would cause medical harm, it would still put it higher than would be ideal for her health.

Maybe there are differences between the different brands, but the G7 from Dexcom's big selling point was "no more calibrations" and the FDA approval for that tagline, and we've been seeing a need to calibrate more than the G6, which is disappointing. Granted... sample size of n=1 so...

[cpwright]

I don't find the Medtronic solution to be that off. But the closed loop solution can't raise your blood sugar, it can only lower it. It only has insulin which it can dial back or increase. The real danger would be if it detected you very high and then tried to rapidly decrease it.

The FDA approved systems do have safeties in there that alarm persistent highs or on any lows. They also won't provide more basal than a multiple of the pre-configured setting you have.

The biggest thing for me was the 780G alarms less than 680G when there is nothing that I actually want to do to change it. Waking up all the damn time is no fun.

[Neff]

Ahh you are right, I had the situation reversed in my head. It would be the false high reading that would be the issue.

That is good to know there are some safeguards in place to prevent an over-correction.

And I agree about the constant wake-ups. The Dexcom system will sometimes not stop alerting when it detects a low, even if she has taken glucose tabs and knows it will be taken care of. If she doesnt interact with the notification it continues to alarm every 15 minutes or so. There is a recompiled APK for the dexcom apps that changes some of the notification behaviors but she hasnt needed to use that recently.