I was so excited to get started on AutoMode on the Medtronic 670G that I finally received about three weeks ago, I could hardly wait. I got started on the pump and Guardian sensors a week before I was able to schedule the 670G training session and waited impatiently for my AutoMode training which finally occurred yesterday. At that training session, I put the pump into AutoMode following the trainer’s instructions and after a discussion about whether or not I should change my Active Insulin Time (AIT) to 3 hours from 4. I am hypoglycemic unaware and also experience rapidly crashing blood sugars. We decided that it would be best to leave the AIT at 4 to start with even though the recommended value is 3. Left the training with a song in my heart and a skip in my step because I’ve been anxiously awaiting AutoMode technology for at least 5 years now. After about 5 hours of watching my glucose readings steadily rise and hitting almost 400 mg/dl, I switched the pump back to Manual Mode and called my trainer. Her suggestion was to change my infusion site and reservoir, manually inject insulin to correct the high blood sugar, and try to go back into AutoMode in the morning. Sure, I can do all that. But I need to know why AutoMode wasn’t working and what I should change to get it to work. So I called the Medtronic help line. No answers there. Same suggestions as the trainer gave me. Searching the Internet (and especially this site - thank you all) I discovered just how important it was to adjust the AIT. So this morning I restarted AutoMode after adjusting my AIT to 3. Same problem. An hour of reasonable glucose levels and then a sharp rise in the readings. This time I switched the pump back into Manual Mode when the glucose levels reached 250. Decided maybe I needed to adjust the AiT even lower. Tried AutoMode again this afternoon with an AIT of 2 hours and 45 minutes. Again, an hour of reasonable readings and then sharp rise.
Anyone else have a similar experience getting started in AutoMode on the 670G? Any suggestions on actions I can take? Should I just keep tweaking the AIT value down in 15 minute increments? Would appreciate any information or insight you could provide.