What is GlucoDyn?

GlucoDyn was created to educate T1D's and their caregivers about blood sugar dynamics. Each day T1D's make decisions about what and when to eat, and how much insulin to use to cover carbohydrates effect. It can be difficult to visualize what is happening throughout the day as carb absorption raises blood sugar and insulin reduces it – particularly when multiple events interact with one another.

GlucoDyn uses calculations similar to an insulin pump’s bolus wizard ( see the Background section for details on the calculations ) to create graphs of blood sugar versus time, based on your inputs of carb and insulin events.

The user can enter carb events, boluses, and temp basals, and GlucoDyn calculates the effect on blood sugar over time.

Seeing the curves and understanding the effects of bolus timing, carbohydrate absorption rate GI value, temp basal timing and rates, etc. will help users with their overall understanding of Type 1 diabetes and its management.

GlucoDyn also allows the user to “slide” the events around once they have been entered – allowing you to see what would have happened to your blood sugar curve if you had bloused earlier or eaten a different amount of carbs “on the fly” – the curves change as you move the sliders.

Concepts

Usage

4 U insulin input @ minute 0

60 gr carb input (90 min) @ minute 0

1 U insulin input @ minute 75

15 gr carb input (90 min) @ minute 75

To enable the user to see cause and effect, the sliders in Input History can be used to modify the simulation “on the fly”. The first slider represents the amount (of carbs or insulin) and the second slider represents the time when it was given. The user can move these sliders at will, and the resulting graph moves dynamically.

It’s quite interesting, for example, to see the effect of pre-bolusing. By delaying the carb intake by say 20 minutes, you reduce the max blood sugar from about 200 mg/dl to just under 170 mg/dl. But, you have to be careful – before the carbs have time to absorb insulin is working, and the minimum blood sugar drops from 100 mg/dl to about 85 mg/dl. These are the kinds of tradeoffs that are critical to the management of T1D.

Understanding changes to timing and amounts, combinations of GI foods, etc. will allow users to better understand their own blood sugar results and improve control.

Assumptions