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Thanks to bednobs,rowanwitch,Sqad,slaney & karenmac60.
slaney is correct on how the dosage is taken, & I discussed cardioversion with the heart consultant who was not happy to do it his reason being that it needed to be done in the very early stages, but I think its more like my age was against me (77), he also says that often it is done & you still have to take warfarin.
Thanks Sqad for your encouragement.