Do you repeat images in patients with venous thrombosis to inform decision about duration of anticoagulation?

The short answer is "no". I do reimage many people near the end of the 3-6 months of treatment, but it doesn't really change my mind about duration of treatment in most instances. I use repeat imaging to help me understand how much of the clot resolved and thus, determine what their new baseline is. This can be very helpful if future imaging shows a thrombosis (so we know chronic vs. new).

Occasionally, I will use repeat imaging to try to determine if a clot was acute vs. chronic (if it is gone ...

Great reminder about the difference between PROGNOSTIC vs. PREDICTIVE factors. Just because the risk for the event can be high does not mean we should administer treatment (which, as in this case, causes more adverse events without affecting outcomes of disease). Too often treatments are given based on prognostic factors only.