Well, considering I came in on this late, and considering his age, Bill will probably stick with the massive regimen of meds and go strictly with his doctors' advice, but for anyone that is interested in treating/preventing blood clots naturally (as in no "rat poison"), nattokinase, which is extracted as a fermented substance from soybeans which works well (alone or in addition to other things) for that purpose (http://enzymeuniversity.com/artman/publish/article_140.shtml). (There's human research and usage also, just most you have to have an account to log-in and find the studies)

Glad he's doing better and hope he is on his road to recovery.

Steve