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I've been wrestling with the problem for several years.
Have you had to take anti-coagulants all that time? I'm on Digoxin to regulate the heart rate which actually went back to normal the day after I started it, which tells me it didn't really have anything to do with it. According to the website of the folks who make the Digoxin, it takes about a month for it to work. I'm also taking 5mgs of Warfarin (generic Coumadin) so any pooling blood won't form clots and give me a stroke (I almost had one in the doc's office when he said that!)
The cardio guy is going to do some research to see if I really need to stay on the Warfarin. I haven't developed any side effects from either meds so that's good.