Hi, Thanks for writing to Health Care Magic, I am Dr Asad Riaz, I have closely read your question and I understand your concerns, I will hereby guide you regarding your health related problem. Atrial fibrillation can be due to many reason n one of dangerous condition.. HTN, IHD, electrolytes abnormalities etc can cause atrial fibrillation.. atrial fibrillation is condition in which heart beat faster than normal n irregular n result Dec CO n this lead to feature of hui perfusion , SOB, pain ... if I were my pateint I would like to ask history how often it occurs n when mostly n do detail exam, listen heart beat n chest to see is there any pilaty Edma indicate heart failure n ten run some test like s/e Bcs these can cause , echo to look for heart function n diameter Bcs atrial dilation can lead to atrial fibrillation , holter monitoring Bcs it can record A-fiib which occur some tym n mah miss in simple ECG .. after it I ll tr it with rate / rhythm controlling medicine depending upon the situation ... I hope this answered your question, if you have more feel free to ask. Regards. Dr.Asad Riaz. General and Family Physician..