I just had a tooth extracted last week and ultimately I ended up going ahead with the 3 day bridge of Lovenox. Initially the plan was for me to reduce to 1/2 doses for the 3 days leading up to the procedure and then restart my coumadin after the procedure. Initially the plan was to bump my dose from 6mg to 8mg for the 3 days following the procedure. My cardio then decided that I should bridge just to be sure my valve was protected.
The fact that you have multiple valves I would want the protection. Im actually taking my 3rd (and last) Lovenox shot today. They are a no-brainer. The cost however is more painful than the needle by far !
My INR was 2.3ish when I started reducing my dose so I expect I was in the 1.5 range when I actually had the procedure. Bleeding was minimal, no issues at all in that respect. The fact that your doing all 4 at once probably is the best solution, this way you don't need to mess with your Coumadin multiple times.