For over a year I have had issues with my heart not beating at regular pase. This lasts for short periods about 5-20 minutes each and it happens about 3-7 times a day. During these periods I can feel a tension in the heart, almost as if it is tightening and it gets hearder to breathe. What is interesting to note is that I run 4-5 times a week and I can workout without difficulties breathing. Blood pressure and heartrate is normal when not having the irregular beats.