I never had luck using AAA rechargeable batteries with the MiniMed 530G. For some reason, the 530G found the batteries not to have enough charge even after I had recharged them completely. Since I started on the MiniMed 670G, I have been using Sanyo Eneloop AA Rechargeable batteries with no issue. The batteries might not last as long as the non-rechargeable ones but they last long enough before they are fully discharged.
Continuous Glucose Monitoring (CGM) sensors are finicky, expensive and we all know of how much of a process it is for Medtronic to replace faulty sensors. For me, changing Medtronic CGM sensors is a ritual I do not look forward for many reasons. Getting my sensor inserted and working correctly seems to be a hit-or-miss proposition.
But the delicate nature of sensors is due to the fact they are miniature electrodes that are affected by small changes in the environment around them including small movements or presence of interfering chemical substances.
Importance of Basal Settings
After nearly giving up on my pump, I found the very popular book by Gary Scheiner, Think Like a Pancreas: A Practical Guide to Managing Diabetes with Insulin. (Amazon) – I think this is a must-have book for people who want tight control of their glucose numbers.
At this point, I had uncontrolled, severe hypoglycemia. With a new-born baby, this was not just a drag on my life but it was a bit dangerous. I do not know how many gallons of orange juice I drank to counter lows.
I had also not paid attention to the importance of fine-tuning my basals. I was using a single basal which gave me big lows at night and when I was doing practically anything that needed me to expend a little energy.
Since many new pumpers are coming from a combination of short-acting and long-acting insulin injections, the idea of basals is a little foreign as compared to bolusing.
I think educators need to spend a little more time talking about how basals are the foundation of successful pump therapy.
UPDATE - I have certainly found out that dialing the Carb Ratio and Active Insulin time up and down do not necessarily mean that you will get better control. That is why it is important to work with your endo or educator to tune these settings.
When it comes to Auto Mode for the MiniMed 670G, tuning the settings to get as close to your sugar targets feels a little more complicated as compared to the manual mode. This is because the closed loop system has a feedback mechanism which will likely throw-off one setting when you change another.
In the course of your day, the system is performing a balancing act between bolus and basal to keep you as close to Auto Mode’s fixed and preset BG target of 120mg/dL by introducing a third input – the micro bolus.
When it is all said and done, the user has control of two settings only, namely Carb Ratio (CR) and Active Insulin time (AIT).
I have used the MiniMed Quick Set Paradigm infusion set for the last couple years. Medtronic recommends that one changes their infusion set every 48-72 hours.
I am the kind of person who questions why I have to do an oil change every 3000 miles and not 5000 miles but think for the 670G it is important to follow these guidelines.
Any blockage on your infusion set and subsequent high glucose readings will most likely throw Auto Mode and it will take hours before you can go back into Auto Mode. This is such a pain especially in the middle of the night since you will also receive a barrage of notifications to rectify the situation.