I'm on month 3 of orientation in a SICU that does a lot of open hearts. Had a fresh open heart the other night with blood sugar of about 160 for a few hours. Preceptor was reluctant to start an insulin gtt and instead gave a bolus of 2 units. While I was at lunch she gave calcium replacement gtt. A few hours later his BS was 114 and she told me it was due to the calcium replacement. I know K can cause BS to drop, but I didn't know Ca could, and I can't find any discussion of it in my usual reference books. Can anyone comment? I think my many questions try her patience at times, but there have been occasions where she meant to say one thing and other words came out instead (don't we all, but I want to know the real scoop).