canon - For all but the most serious cases, afib is temporary. Mine was. I had a few bouts of afib during the first month post-op, but haven't had any since. (I would know of any, too, because my pacemaker would record it if it happened.) That sort of behavior is very common.
I don't have a mech valve, but I changed to an electric shaver after my surgery because it was easier for me to stand up and shave if I could have one hand partially free to hold onto things to balance myself. When I used a blade razor, I needed my other hand to deal with the shaving cream and such. Also, I got a bit lazy. The electric is faster. If I'm going out in the evening, I just shave a second time. The only drawback is in the summer humidity the electric shaver drags on the skin and if you're not careful you can get "shaver-burn."