Back To The Future

Great Scott! Or similar words have been exclaimed by me since the summer of 2023. The reason for such excitement? Hybrid Closed Loop. You've probably read some of my gushing on the subject and I continue to talk positively about it today because... well, sleep never gets old.

Prior to HCL, like many using the tech, I was using a pump and various types of CGMs separately and that was perfectly acceptable. My numbers were as good as they'd ever been; Great Time In Range & HbA1c. I felt no urgency to switch to closed loop.

As is often the case, talking to peers results in changes and it was an unrelated conversation that resulted in one kind person sending me a spare Dexcom G6 transmitter... then another from another person... and Anubis transmitters from two others. People within the diabetes community are really very kind. All that tech meant I could try HCL for a good while - over 6 months. So, I did.

There are lots of posts about how well things went for me in that period. Towards the end of my HCL time, I had my diabetes review with my consultant. He agreed that HCL was working well for me and that funding would be discussed at an upcoming meeting. Fantastic!

Of course, the tech expired as tech has that annoying habit of doing. I thought nothing much of it. I assumed it would be a seamless transition back to simple pumping and CGM use. It was. Reinstalling the old app was a pain in the neck because I can never remember usernames and passwords but, after some swearing and sweating, I managed to get set up again with Dexcom One. Quite soon, I realised just how much work I was putting in to this type of management compared to the recently ended Hybrid Closed Loop days.

The numbers were not looking great. *sigh* I thought I'll get through the life of the current sensor, then I'll buy a G6 transmitter and hop back aboard the Looping train. I noted the difference in managing Type 1 Diabetes through HCL vs standard pumping, on X. Peer support came to the rescue (again). Another spare G6 transmitter landed on my doormat just two days later. The #PayItForward movement is a remarkable one. My donor would not accept any reimbursement for postage. Blessed, I promised to donate something to my favourite diabetes charity - Action4Diabetes as my own Pay It Forward. Of course, if I'm ever in a similar position to my donor friend, I will do the same thing for others. 

So, I'm back in the future! and over the last few days, the numbers are already proving how incredible the technology is once again. When just pumping and using a CGM separately, my average blood glucose was 8.5 mmol/L. I know that's not terrible, really. Yet, I could "feel" it. I was sluggish and just... blunted. Finding the right words is difficult. Needless to say, I was not myself.

And after a few days in the loop?...

Already, a significant difference over the previous 2 days. I think the numbers speak for themselves. You've probably read enough gushing from me, by now.

What happens next? I'm going to relay my experience and thoughts to my diabetes team. To move to HCL, then move off it, then move on to it again seems a little unusual and they may benefit from hearing about what has happened while looking at the data.

Also, and I've said it many times, I can never repay those who have been kind to me over my diabetes in the last 7 years - since opening up and talking about it online. I do try through various means. Some of those don't sit well with everybody and that's alright. Even the kindest will meet opposition and anger and jealousy. Do good things with good people. You'll usually finish up sleeping soundly, especially if you're using Closed Loop! 

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Hybrid Closed Loop - My Thoughts

The future has arrived! Yes, I know many of you reading this will have been managing your diabetes with Hybrid Closed Loop for a while now and that it's not exactly new news for you. 

At Dad Towers, I've been hesitant to take the "next step" from insulin pumps and CGMs to the "all in one" of HCL since I began using an insulin pump in 2021. I didn't feel the urgency to change what was already working well for me, I didn't feel inspired to learn about closed loop, HCL, AID, APS and host of acronyms which were, to be frank, a bit of a turn off. I write those words as somebody who is very pro-tech when it comes to diabetes management and as somebody who understands most of what HCL means. Still, in the last couple of years, I felt in no hurry to try it.

As is often the case, conversations with peers, particularly well-meaning peers within #GBDoc, resulted in the change. As is also often the case, I've done this without the "blessing" of my consultant or an agreement with any of my HCPs. We'll talk about access later on.  The kind-hearted folk within #GBDoc have taken care of me on so many levels in the last 6 years, so I suppose it's not really a surprise to have transmitters, sensors and even different CGMs sent to me to try out. It's not a surprise, yet my heart bursts with gratitude when others offer the time, energy and often money to support me. I'll do what I can to pay that forward, of course.

Right, let's get into it; HCL, is it any good? 

Firstly, take a look at the image above. That's a screenshot from Dexcom Clarity. A nice splattering of green days and impressive time in range. For the system I'm using (Control IQ via Dexcom and T:Slim) those numbers didn't take long to achieve. The first day or two on HCL was fascinating to watch. My pump was constantly adjusting my basal rate, administering little boluses, reducing basal, suspending insulin, etc. Basically, it was micro managing everything and doing so for 24 hours a day. I love a little micro managing action myself, but even I can't do that for 24 hours a day. Impressive stuff and the results were almost immediate, lines have been flatter, spikes less spiky, hypos less severe, and I imagine my next HbA1c will reflect this improvement in management...

...management? Yes, you're still the boss, you can still administer a dose, you still need to carb count and pre-bolus for your meals & snacks. You're not a complete passenger with HCL but, if you're anything like me, you'll need to learn to let the machine do it's thing and trust in the tech. 

I've put HCL to the test a few times, including early on when I purposefully carb counted 50% lower than the meal actually contained. I expected a spike and it did happen, yet HCL sprung into action and upped my basal rates quite dramatically. It caught my purposeful error and brought me back into range within an hour or so. Wow!

Recently, I spent a few days away on a short break. That included a day at the beach. Walking and warm weather is a recipe for a hypo for me, but I thought I'd put HCL to the test again. I left my hypo treats in the car and armed only with a debit card to purchase food and drinks from a little cafe, I set about wandering around the sands... some running around too, with a Cocker Spaniel enjoying the new environment to sniff and explore. I kept an eye on Control IQ, which displays my blood glucose alongside exactly what's going on insulin wise. From a starting BG of 7.6 mmol/L, things dipped to 5.8 mmol/L and at that stage my insulin was suspended by Control IQ. Trying to not worry, I headed to the cafe to buy a sugary drink and as I cracked open the can of brown fizz, my BG was back to 6.4 mmol/L. No input from me, closed loop did all the work.

Of course, I'm not suggesting ANY level of exercise won't require some input from you when you're using HCL but, for me at least, walking around a beach for a few hours wasn't the huge problem it once might've been. And I definitely don't recommend leaving your hypo treats behind - That's just silly. 

However, that's a tremendous thing about closed loop; it reduces the worry, the decision making. You can just crack on with whatever you need or want to do and if any problems arise they're likely to be minor ones that need minimal input from you. 

It's not a cure. It's definitely not an "artificial pancreas". What it is, is an advanced way to manage T1D. Now, the only issue for me, as it was with pumping, will be to convince my consultant that HCL is right for me. That means obtaining Dexcom G6 funding.... or does it?

Whaaaaaaat?

Well, the thing is, Dexcom One sensors will work perfectly well with G6 transmitters. The sensor codes have been "hacked" and a list of Dexcom One code: 2222 = Dexcom G6 code: 4444 (as an example) is freely kicking around on your Interwebs. So, essentially, I only need the transmitters while I'm prescribed Dex One sensors. Conversations are to be had! 

Finally, you've probably noticed that Partha & co. have been working hard on making HCL accessible in NHSE. There'll be criteria, and from the outset it looks less stringent than the insulin pump criteria of old (7.5% A1c vs 8.5%) so, that's a good thing. I imagine access will be more relaxed as the next few years roll by until we reach a point where all with T1D can access closed loop in England and Wales. Perhaps that's called the Libre Point? Remember in 2017/18 when access to Flash was the big issue? Here we are, 5 years later and still not cured, but access to that tech is no longer a problem.

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