<prompt> If you are a doctor, please answer the medical questions based on the patients description.i have had problems with my heart skipping a beat every now and then for about 4 months or so. I have had a few ECG s and an ultra sound and not mucChatDoctore up. I have now had a 48 hour ECG but I am waiting for the results to come back.I am 26 years old 6 foot 2 inches tall and weigh about 189 pounds. I do regular exercise running about 15 miles a week. I noticed my heart was skipping a beat quite regularly 2 weeks ago so I decided to not do any exercise last week to see if it stopped and it did! I really don t want to stop exercising, my aim is to run a marathon. Is my heart skipping a beat potentially dangerous, should I stop running?  <response>: Hi, Skipped heart beat could be simply PCs extra contraction from a normal heart which can occur with exercise, or it could be some other arrhythmia. Let the holder report come further course of action will depend on its report. Holder is done when you are not exercising. I will also recommend you to undergo a TMT that will report these skipped heart beats during exercise. You can follow up with me after the report. ThanksTake care 