I am 75 years old, male, I have nonvalvular a-fib long standing since 2010, I am on warfarin all those 7 years, I have no any bothering or disbursing symptoms, I had three times EKO test, result still normal status for heart, pulse always 60-75 / min, blood pressure normal 130/75, I am not diabetes , no any previous health problems, blood test results alway normal , no cholesterol . my main concern : - do I need cath- ablation, is it safety for my age - Is it better to convert from warfarin to one of the new anti-clotting drugs like apixaban Many thanks Fadel