Conversation: The conversation between human and AI assistant.
[|Human|] I have recently taken up cycling (4 weeks ago) and do between 15-25 miles per day, I do not have any problems while exercising. I have noticed over the last two weeks that my heart feels like it is fluttering while i am resting, probably a bit worse after eating
[|AI|]  Hi, Welcome. This is Chat Doctor. Fluttering of heart could be abnormal arrhythmia (Atrial Flutter or Fibrillation) or could be normal sinus arrhythmia (variation in heart rate with respiration). So for diagnosis, you need to do ECG at the time of these fluttering. If its duration are short, we put a 24 hr ECG monitoring called Holder Monitor. Also do a 2D Echo to see for any associated cardiac abnormality, if any. Thanks