I agree, you need a long-term monitor recording, and ecg/ekg is on for only a few seconds, about 10-15 seconds in my experience. So, if your hear happens to be running normally during that period there is nothing to see. Maybe a 24 hour monitor will catch the bad action.
It sounds like you need to ask the doctor for an event monitor or a 24 hour monitor so that you can get a recording of the arrhythmia. I have had the same thing happen to me...I would never experience the.the irregular heart beat when I was having an exam, etc. which was so frustrating. So, the monitors are a wonderful way to capture what is going on at any given time.
Do you have a history of these irregular beats??
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Good luck and take care.