Warfarin use
You may have test your INR levels weekly with a self administered blood test and call in your results. They get sent to your doctor who can advise you whether you need to adjust your dosage.
I am a surgeon who routinely prescribes warfarin and other anticoagulants after joint replacements. I suggest the following:
1) when using these drugs you will bleed more easily if injured whether from blunt trauma or penetrating injuries. Small cuts can easily be dealt with with pressure and rest and ice; bruises will be common and cosmetically displeasing. A major fall may cause a contusion with subsequent hematoma formation; if it is large it can be disabling or even become infected and/or require drainage.
2) Above all, do not climb heights or use a bosun's chair. A fall from a height may cause fatal bleeding if you strike your head or other parts of your body which can cause internal bleeding. A few years ago I was in the ER when a man came in having fallen off a ladder about 8 feet up. While smiling and conversive on arrival he was dead 1 hour later from a tamponade of his heart (bleeding into the sac around his heart which then constricts it and prevents it from doing its job). I saw this with my own eyes and in spite of measures to drain the heart sac immediately the bleeding could not be controlled.
I also happened to be in Sturgeon Bay last week when a boat sailed in after having sustained a knockdown during a white squall. The 1st mate was slammed down and sustained major bruising of her thigh. Had she been on a blood thinner this may well have caused a major problem although not life threatening.
3) If you are cruising for any period of time you will still need to have your blood protime checks, often daily or weekly at first to make sure your levels are therapeutic and just as important not too high so that you do not bleed; you will also have to watch what foods you eat as they affect the actions of coumadin. This however is not necessary if you are allowed to take an oral blood thinner such as Arixtra or others, but I don't know how this applies to heart valves and whether Coumadin is preferred.
4) Easy for me to say, but go with the best heart valve option; everything else beside loved ones is secondary