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Entries in DexCom Blog (58)

Wednesday
Feb272013

Pre-Bolus

 

Original art by Mike Lawson - Check out Mike's YouTube page by clicking on the image

This story begins in 2006 just moments after I asked Arden's nurse practitioner if she was "nuts".

NP: <blank stare>

Me: <incredulous gaze>

Only moments before our staring contest began Arden's NP became the first person to suggest that I give Arden her mealtime insulin before she started to eat. I can't be sure if she referred to the practice as pre-bolusing, probably not as we were MDI, but she definitely wanted me to inject before Arden ate.

"Are you nuts?"

I responded emphatically that I could never give Arden insulin before she ate. Arden was two years old and there was no way to be certain of how much food that she would finish. The NP repeated her very reasonable request but I could not wrap my head around this new idea. Pre-Bolusing, bah, Arden would be safer if I left her alone at the mall with money pinned to her shirt.

I was 100% correct on that day. There was absolutely no way to be sure of Arden's appetite. However the inability to guess how much she would eat wasn't the only reason I didn't want to inject before meals. Arden weighed maybe nineteen pounds at the time and Novolog had a way of peaking intensely in her body. She had already experienced a seizure from an insulin miscalculation that I made. That mistakes lesson was still very fresh in my mind and with that bad memory still looming over me, I just couldn't bring myself to administer insulin that wasn't already covered by food or a high BG.

Of course everything that the NP said made total sense. I wanted to give Arden's insulin a head start, I dreamt of a moment when her food would begin to expel it's carbohydrates just as the insulin was pulling her BG lower. I could picture that perfect image in my mind, a tug-of-war with food on one side and insulin on the other. Both combatants pulling furiously without once moving the rope that is Arden's blood glucose value - the dream of a steady mealtime BG. I wanted very much for that to be our reality and so I promised myself that I would make the adjustment when the time was right.

Fear and poor timing stopped me from taking the NP's advice all those years ago. Eventually the day came when I found my footing with the idea and gave up on being scared... that's the day Arden's A1c began to decrease.

We haven't looked back.

The beginning of our trip down the road to pre-bolus freedom was littered with pot holes. The first bump took some time to traverse, we first had to wait until Arden was old enough to give thoughtful consideration to her hunger. After that hurdle was cleared we took the first step, bolusing ten minutes before a meal. Those next ten minutes were the most tense of my day, I would test and worry so much after the bolus that I barely had time to finish cooking. Initial results were less than stunning so I moved the pre-bolus to fifteen minutes before a meal. The extra five minutes increased the impact of the insulin and lessened Arden's post meal spikes, but I still wasn't seeing a huge return on our efforts. I wanted to take the process to another level but I couldn't, in good conscience, give Arden insulin farther from the beginning of her meal. If only I could see the insulin work, I needed a crystal ball...

... or a DexCom CGM

Arden's CGM turned pre-bolusing into the most valuable weapon in our arsenal. It's one thing to have a good idea of how long it takes insulin to begin working in the body. But when you are able to not only witness the movement of the BG, but also the speed with which your glucose level is rising or falling... it's the difference between rumor and fact... between guessing and knowing with reasonable certainty. The day that my eyes were opened to the benefits of wearing a CGM, that was the day that everything changed.

Arden was 149 before dinner last week. I bolused for the elevated BG and pre-bolused for 50 carbs, it was a significant amount of insulin for her. Before DexCom I would have panicked and served the food in less then ten minutes. Now I take my time finishing dinner while Arden and Cole do their homework and leisurely prepare their plates as I wait for the CGM to tell me when to serve.

I put dinner on the table when the arrow on Arden's DexCom G4 turned south, waiting until her BG was below 110. The amount of time between Arden's bolus and her BG decline can vary most days depending on a number of factors. Glucose monitoring grants the flexibility to wait, providing a level playing field for the insulin and those scrappy carbs to wage their battle on.

At least now it's a fair fight.

Don't forget what the bottom of the site says... Always consult your doctor before making changes to your health care. I am not a doctor.

 

 

More about the art: The art work displayed at the top of this post is an original piece from Mr. Mike Lawson. Mike is a tireless advocate for people with diabetes, a friend and extremely talented artist. You can find him working at TUdiabetes, on Twitter and through his fantastic YouTube channel.

Wednesday
Feb062013

Opsite Flexifix

For the first time since Arden began wearing a CGM we are using a third party product to aid with adhesion. Back in December I realized that the adhesive on the new DexCom G4 sensors wasn't as resilient as it was on the prior version of the device. I tried for a few weeks to be sure that we weren't just having a bit of bad luck, but after a few attempts my suspicions were validated. As others started to experience the same lack of longevity the Internet became littered with folks saying that the new DexCom G4 adhiesive just doesn't stick like it did with the 7+.

I knew instantly that I wanted needed to add a third party product into the mix and I began to search online for options. All of my research led me to want to try Opsite Flexifix first so I ordered a roll on Amazon and waited for the UPS driver to arrive. 

I later found a post on the D-Mom Blog that explains, step-by-step, how Leighann prepares her daughter's Flexifix to work in conjunction with a CGM sensor. I co-opted Leighann's plan for how she cuts the center hole and made one small change. Instead of a significant overlap, I cut the Flexifix just slightly larger than the DexCom's original adhesive (image below).

Tomorrow will the twenty first day since the sensor above was applied.

Opsite Flexifix, write it down.  

Monday
Feb042013

Basal Adjustments

I was asked on FaceBook to explain how I made the adjustment to Arden's overnight basal rates that resulted in the graph above. I'm sorry that it took me so long to write about my (less than technical) process. Here's how I did it...

Somewhere around the second week of overnight lows it became obvious to me that I was dealing with a trend and not an anomaly. Something had changed about her physiology and I was going to have to adjust - basal adjust.

I'm not going to lie, I didn't do any basal testing. I have the procedure around here somewhere, the page or so of directions from Arden's endo that explains how to do basal testing - but I tried a more, let's say, personal approach. Luckily CGM technology lends a distinct advantage and unless we are averting a low, Arden doesn't eat at this time of night so trend graphs are a perfect way to understand where we have too much basal insulin.

I broke out the stupid PC laptop that we had to buy, because the damn device manufacturers refuse to port their software over to OS X (Apple), then I downloaded Arden's DexCom data. It only took a moment to see what time of night that her blood glucose was drifting lower.

Arden's overnight basal rate was .30 per hour, all I did was dial it back to .20 starting one hour prior to when her BG was beginning to fall, not terribly scientific I know. The possibility that this adjustment would be too little or too much wasn't a huge concern, because let's face it, I'm awake anyway.

As you can see in the image above, the slow drift that was beginning around 4 am leveled off nicely. The picture you see here shows that there was room for a little more basal insulin. I waited two more nights to verify that this graph was accurate and then I moved the basal to .25 an hour. That adjustment caused a slight dip and so the next night I staggered the hourly rates .20, .25, .20, things have been golden since.

The reasons that I like handling basal adjustments myself are simple. Waiting until Arden's next endo appointment to discuss this doesn't feel like an option - too long. Continuing to live with lows would have not only taken the rest of the precious little energy that I have left, but also it would leave Arden in danger - not doing that. People living with diabetes will always need to make adjustments like this. Their bodies, like everyone else's, are constantly going through ebbs and flows. My pancreas doesn't secrete the exact same amount of insulin every hour and it makes sense that Arden's pump shouldn't either. Arden's body has needs, ever changing needs - I have to keep up with them.

We all have to be comfortable making decisions like this autonomously at some point. As parents we don't always have the time to call for an army of help and our children's bodies shouldn't have to wait days or weeks for balanced control. Don't get me wrong, I wouldn't make a grand change to Arden's care without our doctor and I don't chase every night that doesn't go perfectly, but basal adjustments when they obviously are needed... We can do that!

If you are going to make basal adjustments please don't forget to write down your old numbers in case you have to switch back. Actually, if you don't already have that information recorded somewhere, take a moment to do that. Write down basal rates, IC ratios, alarm thresholds and all of the other personally inputted data that your pump and glucose monitors retain, just to be safe.

Later this week I'll be talking about Pre-Bolusing, Arden's latest A1c and more... stop back, like Arden's Day on FaceBook or follow the RSS feed to stay in the loop.

Good luck getting those basal rates where they need to be and then enjoy the huge difference in your BGs!

Sunday
Jan272013

DexCom G4 Platinum: Follow Up

It's been three months since I first gave my impressions of the new DexCom G4 Platinum CGM and two months since I published a Second Look piece. Today it's time for a follow up...

 

Overall I am quite pleased to say that everything that I previously reported to you about the G4 still stands as true. Signal distance is vastly improved, insertion is less of an issue from a pain standpoint and accuracy is often spot on. What then you ask prompted me to write a follow up? I wanted to share my experience with DexCom customer service and how they handled my call to tell them that the thumb pad on Arden's receiver was breaking.

 

Before I get to the thumb pad I want say that not long after we began to use the new G4 I noticed an odd video noise on the screen when the receiver transitioned from screen to screen. It happens mostly when entering a BG, a garbled image appears as the receiver switches from one screen to the next. I never noticed a decrease in the receiver's accuracy so I assumed that the video noise wasn't a critical issue and decided not to call CS over what I deemed a cosmetic glitch.

A few weeks later the thumb pad began acting up. The thumb pad is basically five buttons, up, down, left, right and center. The donut shaped disc handles the directional clicks and the small nub in the middle, selects. Our unit's disc began to not go back into place after selecting down. The disc would rock as it should toward the down selection but then never fully return to it's starting point. I felt like it was only a matter of time before the disc became worn further. I imagined that soon instead of just getting stuck in the down position the disc was going to pop out. I let things go for as long as I could and then I called DexCom this past Saturday morning.

I explained that the thumb pad was loose and getting worse. The kind woman on the phone asked politely if I had dropped it, we hadn't. She verified my address, apologized that it wouldn't be able to ship until Monday and explained how I should go about making the switch once the new unit arrived. The entire call took less then five minutes. It was very pleasant.

It seems that I timed my phone call almost perfectly as nine hours later, as we were preparing to eat dinner for the first time at Harold's in Edison, NJ, (you may have seen the picture on FaceBook of Arden with our "slice" of cake) the thumb pad fell out completely. I used a piece of packing tape to hold everthing in place until Tuesday. Here's what the unit looks like when the thumb pad comes off:

 

Initially I wanted to be annoyed that the receiver had issues after such a short time, but instead I took a more reasonable position. New technology is prone to issues like this, early adopters take a risk in my opinion. As long as the manufacturer stands behind the product and doesn't make its replacement a headache, I'm okay with stuff like this happening. I wish it wouldn't, but I understand. I hope that my issue is either isolated or promptly addressed by DexCom. Who knows, maybe it already has been in more recent runs of the product.

If you are seeing this issue with your unit, It's my opinion is that you can expect it to eventually become a problem that will need your attention.

Thursday
Jan102013

Please Test

I need this post to accomplish two distinct and important goals. The first one will be simple. I want to thank my wife Kelly and my daughter Arden for both being so amazing. You'll see why in just a moment...

Second and maybe more importantly, I want to take this opportunity to remind everyone that while CGM technology is fantastic, it isn't foolproof. Because of that sometimes ignorable fact, we always have to test. Normally when we speak about this topic it's in response to the notion that you shouldn't bolus based on a CGM number. While bolusing without testing is something that we should never do, most of us probably have... but we shouldn't becasue CGM technology is designed to be used in addition to testing, not in place of.

Tonight while I was with my son Cole at his baseball practice (yes I know it's January) Arden's CGM alarmed and reported, "101 arrow straight down". Kelly, being the D-mom rock star that she is, tested.

Please test because sometimes, not often, but sometimes, 101 is actually 36. The DexCom CGM technology is so wonderful that it's easy to forget that it isn't perfect. I've been as guilty as the next person of leaning on it too much when I know that it isn't always spot on. It's difficult not to, especially after the sensor has been on for days and consistently reporting numbers that are so close to our tests. Next time that I'm inclined to think that way, I'm going to remember something that Arden and Kelly told me when I got home and I hope that you will too.

Kelly later said that she tested Arden because Arden said that her eyes "felt funny". Arden told me the next morning that it felt like she had been looking, too long, into a computer screen and then suddenly turned away. "My eyes were getting dark" she told me, with no inclination for how her words were breaking my heart. 

I gave her the bolus a few hours before at dinner that caused this low... and her eyes got dark.

Most moments with type I diabetes are uneventful. Our vigilance gives us the sense that we have the disease under control, but that's a foolish notion. It's only under our control until it decides that it wants to run away. When diabetes decides to run you can't stop it. Your best hope is to chase after and keep it in sight until it gets tired of running. Then you can stand next to it again, pretending that you are partners.

We're vigilant because we can't predict when diabetes will take off running, that's why we test. You aren't taking the test, it isn't you that's being judged. It's a test of diabetes, an indicator for whether diabetes is going to stand next to you and play nice or run away.

Please test.

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