I had two events. I was driving, suddenly I felt very ill/ passing out. Split second... fast forward ambulance, ER etc., dx witjh low Potassium. Finally got a copy of the Ambulsnce EKG - showed it to a heamotologist, general surgeon, pediatric surgeon (friends). All are great experiences Dr. Harvard trained,. 30 years experience, great reputation etc., All picked out one section and dx ischemia. I showed it to a cardiologist (another top Harvard Professor) who determines it is a completely normal EKG. Went back to other three who were stunned. How can the interpretations be so different. I had a 24 hour holter rate was from 43-143 bpm all these Dr including cardio are very, very good Doxtors