The best article showing the prognostic significance of hyperkalemia.
My nuggets from it:
1. hyperkalemia >5.5 meant certain death unless you treat with antidote
2. treatment of hyperkalemia with methods that alkalinize the serum, force K movement into the cell, or force the elimination of K don't make sense in these cases. Hyperkalemia here is just a measure of Na/K ATPase poisoning by digitalis glycosides.
3. Hyperkalemia was better prognostic marker for mortality than either ECG and digoxin level.