Editors Note: We are very excited to have our first professor of Nephrology guest blog with us here at BoringEM.  He kindly asked one of his residents to write up the “C BIG K DROP” mnemonic (see Tiny Tip from September 22, 2014), but he also obliged us with an expert review of the topic.  The association of electrocardiogram (ECG) changes in the setting of hyperkalemia is a medical emergency.  As with most emergent …