When you feel fluttering in your chest, it may be due to irregular, rapid heart beat
e. "arrythmia." if that is the case, the ekg will only show the abnormality if it is hooked up at the exact moment the symptoms occur, i.e. When the abnormal rhythm is present. (prolonged monitoring, with devices worn at home, can be used to try to capture the rhythm when symptoms of palpitations occur.).