I am a 71y male, active , working medical professional, with Hx of Htn & carbamatic mechanical aortic valve in 2000 for AI. Non Eluding Stent in Nov. 2009. Although published INR range is b/w 2-3 for patients on triple anti-thrombotic therapy of 75mg clopidogrel, 80mg asprin & warfarin,I've also heard that INR of 1.5 - 2 is also acceptable. Kindly verify, confirm, advise, forward relevant studies/trials PDFs.Thank you for your timely response and effort.