It's the 5th anniversary of my On-X valve today, thought I'd pluck up the courage to post my first comment. Back in 2015 I was told I was going to need surgery to replace my bi-cuspid valve. Got the phone call to let me know the date - Friday 13th of November. Had my OHS in Oxford (UK), everything went really well. I used to be superstitious, not so much now, I get to celebrate the day. I have had a couple of little issues in the last few years, but the heart valve has been going strong. INR is pretty stable and I only have to have a blood test every 2 and half months now.