ECG Case #2 - Question #3 Answer

What medical therapy will reverse the ECG changes of hyperkalemia almost instantly without changing the actual potassium level?

Intravenous calcium administration. Look at the below two ECGs (note time stamp in lower right). The first is the original ECG tracing, the second is an ECG from the same patient just 2 minutes after calcium is given intravenously. 

Before:

HyperK-Before

After: 

HyperK-After

PROCEED TO ECG CASE #2 QUESTION #4