Scar Tissue and Insulin Absorption
When I was diagnosed in 1945, 70 years ago, I do not think my doctor knew that I should rotate sites when injecting insulin. My parents were so good about listening to my doctor, and we followed his advice without fail. We injected into the muscle on my upper legs for many years, and there were always very high blood sugar reports from the doctor's lab every six months. I think that was because we were not using different body parts and rotating sites. Scar tissue had probably formed on my very small legs, even though the animal insulin I was using required only one injection per day. By the time I was in mytwenties I was using my upper abdomen, and my blood sugar reports improved. There was no meter for measuring my blood sugar at home until the mid 1980's, so the biannual reports from the doctor's lab was the only thing I had to determine how I was doing. A1c's were not available until 1980.
In the 1990s I had a meter and much better insulin. Several injections were required each day, and I was still using my upper abdomen. Eventually it became very difficult to push the needle into my skin. I actually had some needles bend, and had to get a different disposable syringe, reload and try a different spot. I had not been told that this might be scar tissue, no doctor had ever mentioned that. No doctor had suggested alternating sites. Maybe my doctors in the 1990s assumed I knew about this since I had been type 1 for 50 years at that time. In the new century I was using basal and bolus insulins, and doing as many as 8 injections every day. The toughness of my skin in my upper abdomen made it necessary for me to start using my lower abdomen and upper legs. It was common sense on my part that caused me to make that change. My blood sugar tests improved significantly, but I still did not know it was because I had moved away from the toughness in my upper abdomen.
In 2007 I started using a pump, and things were going very well until I tried my upper abdomen. I got a 'No Delivery' alarm on my pump and did not know what that meant, so I called the Medtronics help line. After a long discussion it was decided I had scar tissue. That was the first time I had heard those words. A very young sounding lady at Medtronics made that diagnosis, but my very experienced doctors had never mentioned it. This made me very angry, and it has taken me a long time to stop feeling bitter about it. At least one doctor should have told me about site rotation. I have permanent scar tissue in my upper abdomen and can never use it again. The skin will always be tough, and the insulin absorption almost nonexistent. I tried using my upper ab earlier this year, and saw very high blood sugar in the next few hours. I am presently using my lower ab and upper legs, rotating infusion set locations. If I don't change sets after three days I start seeing high blood sugar. That is because scar tissue is beginning to form there. I keep the sites about one and a half inches apart, and change every three days. I have now had A1c's in the 5.5-6.4 range for almost ten years. Finding someone who told me about scar tissue has greatly improved my control. I will never know why I managed to avoid diabetes complications for the many years that I was not rotating sites, and having so much high blood sugar. I have some mild nerve damage, but my overall diabetes health is very good. That almost seems like a miracle to me.
I have frequently advised pumpers to rotate sites, and not use a site longer than three days. Most of my friends who pump are doing that, but I have met online pumpers who say they are using an infusion set for more than three days. One pumper says he uses sets for as much as a week, without having problems. I did not think that was possible. To keep scar tissue problems from occurring, and poor absorption giving very high sugar results, I strongly advise all pumpers to rotate sites, and avoid using a site more than three days.
I feel so lucky to have avoided serious complications after experiencing scar tissue and high blood sugar for so many years. I wish I could meet the young lady at Medtronics, and give her a big hug! lol