arrithimas

My husband has had Arrhythmia for about a year and a half. It started out and would come when ever. He has had a electrophesiaologist study done and is on beta blockers only when it occurs. The studys didn't pin point where his heart was misfiring and they said there was no reason why it is going on. About 3 months now it comes for 2 weeks and then it is gone for 2 weeks. Why the pattern? His Arrhythmia  is like his heart skips a beat. I can put my head on his chest and hear it. It sound like it stops for a split second. Have you every heard of the pattern 2 weeks on 2 weeks off? Thanks, Linda