Trina:
Where are you going for INR tests? (BTW, congrats on having had your surgery at St. Luke's -- the 5th best in the United States, according to U.S. News & World Reports.)
My sister is on warfarin for 3-6 months, thanks to a clot following varicose vein surgery.
They put her on 7.5mg X 7, which I thought might be a little high. First INR, on my INRatio 2 days after initiating therapy, was 1.7. Three days later it was 2.9, which was good. (Nancy said the nurse thought it a "little" high. I told her 2.0-3.0 was usual range for clots.)
Then she developed a bladder infection and had to go on antibiotics. First antibiotic was deep-sized after culture showed bacteria wasn't responsive to that Rx. So she was put on Bactrim. I told her that her INR would really increase.
You bet it did. Her INR on Monday, Aug. 3, was 7.0. So her doctor (guess family doctor) said to skip 2 doses, and restart on Wednesday at 5.0mg, and come back on Monday, Aug. 10, for another INR. I think her doctor is bringing in her cardiovascular surgeon on these instructions.
I agreed that skipping only 2 days was probably appropriate and restarting at a lower dose was OK.
Her doctor doesn't have a finger-stick monitor, so she has to have lab draws. She now understands why I cherish my INRatio!
So -- in light that she only held for 2 days, then went back to a lower dose (mind you, she doesn't have a mechanical), it appears that your doctors may not understand anticoagulation therapy as well as her doctors seem to so far.
Have you checked around Houston for a Coumadin clinic?
Check out these clinics in Houston at the Anticoagulation Forum's website:
http://www.acforum.org/clinics_southwest.htm#TX
Depending on where you live in the Houston area, you may want to look at one in a suburb.