Thursday, 11 June 2015

Issues with new sensor and the Dawn Phenomenon

It was time to remove my second sensor a few days ago, and time to start up my third sensor. Image taken right after I let my wife pull off the sensor. Again, no issues with keeping it stuck for 14-15 days. The extra tegaderm over the sensor do help and you can see the ripple effect it caused on my skin.

The dawn phenomenon could be clearly seen in action during many nights. Around 4am, my glucose levels suddenly starts to rise. This is due to the liver releasing glucose in order to prepare me for the day (If I understand it correctly). The graphs below show the sudden rise (+-4am) while I was still sleeping. It gets kind of difficult to manage this, you need to perfectly time the long acting insulin to peak at 4am or start the night on a lowish glucose level (which increase the probability of a hypo during the night), or just make sure to wake up and eat breakfast asap after 5am. I really like my sleep, getting up early is not my favourite option.

My 3rd sensor is giving me some issues. It seems to be always lower than my BG readings (offset issue). There also seems to be some scaling issue. Abbott is going for a calibration free option with the FreeStyle Libre, but it would have been great if they just added an option to calibrate the sensor in case something goes wrong or is a bit off. The readings still follow my BG trend, but needs an adjustment.
Due to my limited stock of sensors and no Libre support in South-Africa, I'm keeping the sensor in, hoping that the offset might improve over time. The asterisks (*) on the graph shows the BG readings (done with a finger prick test). 

Yes, I'm not having a good BG day today, but the readings from the Libre seems to improve a little, hopefully it will be as good as the previous two sensors soon.

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