Well @gloaming and I posted at the same time with very different perspectives. Both have validity. I have a lot of respect for @gloaming but I have also seen my mother on Coumadin and what happens with falls, as well as micro bleeds in the brain. I carefully managed her INR with the clinic. There are newer anticoagulants, obviously. It is truly a risk/benefit decision.

If your father can monitor at home and assess the frequency and duration of afib, then short term anticoagulation may be a possibility. He can ask a doctor about this. Again, I recommend "The Afib Cure" though I think the title is a bit misleading.