Has anyone used high dose insulin for ca blocker toxicity?

High dose insulin-Dextrose infusion to treat calcium channel blocker toxicity

We are currently using this at our hospital and all of the nurses have been trying to figure out how it works and why. We are also curious about how we should be titrating the insulin and dextrose infusions. If you have ever used this therapy at your hospital, please post back with some examples of how it was done, and what you have learned.
Thank you in advance!