###Human: Which valve would be best for my mitral stenosis, biological or mechanical? ###Assistant: Hello. Yes, she is now a candidate for mitral valve replacement. However, you should make a note that valve replacement is not a complete solution. Firstly, at this age, a mechanical valve is better considering the durability of the valve. Bileaflet valve is the preferred one. Next, she has to be on regular blood thinners. Otherwise, there is a risk of valve dysfunction which may lead to a repeat surgery if blood is not adequately thinned.  Also, this heartbeat problem may not go even after valve replacement and has to be controlled on medicines. Even now she should be on beta blockers like Metoprolol, then Diltiazem to keep heart rate controlled, which are quite effective. I hope this helps you and get back if you have any doubts.