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What should be done when on anticoagulant acenocoumarin for mitral valve replacement and INR keeps fluctuating?

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Internal Medicine Specialist
Practicing since : 2006
Answered : 161 Questions
I have had MVR about 20yrs ago and have maintained INR AT 2.5 TO 3.0, with Acitrom 1mg and 2mg alternate day since a month the INR IS fluctuating and goes to 5.5 and if I miss about 3mg it goes to 1.5 or so Diet has been the same Pl advise
Posted Sun, 19 Jan 2014 in Hypertension and Heart Disease
Answered by Dr. Hardik Thakker 58 minutes later
Brief Answer: brand/compliance/ interaction/ genetic polymorphis Detailed Answer: Dear patient. Greetings from health care magic!!! I am Dr Thakker and shall be answering your question. You are on anticoagulant acenocoumarin for the mitral valve replacement. since your INR has been fluctuating of late we would consider the following: 1) Have you changed the brand of medicine? The bioavailability of different brands differs slightly. I would suggest you stick to same brand as before. 2) Have you been compliant? I would suggest you take the medicine at 7 pm every day so that you don't miss out on the dose. 3) Have you consumed a lot of green leafy vegetables this month? They contain a plant form of vitamin k which will interfere with action of acenocoumain. 4) Have you taken any other medicine like phenytoin/ rifampicin/ cimetidine? these affect the enzymes which metabolize the drug acenocoumatin in your body and affect the INR. 5) Genetic polymorphism: I would recommend you to perform CYP2c9 and VKOR isoenzyme study. You may be having an enzyme isoform which metabolizes acenocoumarin slowly. I hope this helps you out. Please reply to the above questions. If you have any more questions, please do not hesitate to write back to me. Yours sincerely, Dr Thakker.
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