I was wondering the same.
Oh yeah, I had an EKG, and the ER staff was cool. I think since I have a history of heart failure/poor rhythms, they just ran blood work, found out my potassium was low, gave me a big dose and sent me home. I talked with my electrical heart doc today and he thought it was definitely the potassium. Sometimes I think they just say what you want/need to hear, but in this case I believe they were correct. I've taken a couple large doses of potassium and feel much better today.