I had a St. Jude valve put in 6 mos. ago.  Since then I have had loss of vision in one half of one eye at least every 2 weeks.  Also, my inr is all over the board.  Now, they tell me the valve is leaking from the center, judging from a tee and echo.  Is this common?
Hello, I have gone through your query. Thanks for using Chat Doctor. Your complaint of loss of vision is no way related to central leak of valve. As you mentioned that is your INR is properly controlled, then you should try to find out other causes of temporary loss of vision like Ties(transient ischemic attacks) affecting brain arteries. Yes central leak if mild should not cause any worry to you, as mild leaks impose no burden on heart. My best wishes Chat Doctor.