Acitrom Dosage

Hi,

My mother has recently undergone a PBMV surgery. Before the surgery she used to take acitrom 1mg & 2 mg on alternate days. At the time of surgery, doctor changed the dosage to daily 2mg of acitrom and adviced a PT INR after 1 week. After that week, PT INR showed 1.9, and doctor suggested to continue the 2mg doce daily for 1 month.

Now, after 1 month when we had a PT INR, it resulted in value of 5.4. Then immediately doctor advised to stop the acitrom for 2 days and asked us to repeat PT INR.

After 2 days of stopping the acitrom 2mg dose, the PT INR value reduced drastically and showed a value of 1.4.

We are really worried about this fluctuation of PT INR values.

The problem is that, we got appointment of the doctor only after 2 days, and now we have no clue on whether to stop taking of the ACITROM for another 2 days [because the PT INR shows 1.4  for stopping ACITROM 2mg only 2 days and we are really concerned that if we stop for another 2 days, PT INR might even come down further].

Now, if we have to take the ACITROM for these 2 days, what dosage do we need to take?
What dosage is safe to take for these 2 days considering the PT INR value of 1.4 at present?

Any expert suggestions would be very helpful and thankful.