Sherry,
This is to answer your question about therapeutic INR's. Supplement to Chest, January, 2001 is the "bible" for anticoagulation - concensus statement on multiple topics. DuPont (manufacturer of Coumadin) is also a wonderful reference and can be reached through the internet. Dupont provides educational materials free of charge generally and produces a trifold "Guidelines for the initiation, monitoring and clinical use of antithrombotic therapy in venous and arterial disease" - fantastic reference pocket card. Basically post MI and mechanical valve are target INR of 3 (2.5-3.5) and everything else target INR of 2.5 (2.0-3.0). Bernie