Summary
The optimal duration of oral anticoagulant therapy following proximal deep vein thrombosis
(DVT) in the lower limbs remains controversial. To compare the risk benefit tradeoffs
for different treatment durations (6 to 24 weeks) we constructed a Markov-based decision
analysis model which explicitly balances the time-dependent declining risk of recurrent
thrombosis and pulmonary embolism against the risk of major hemorrhagic complications.
Specifically, we determined the threshold below which the risk of recurrent DVT exceeds
the risk of major hemorrhage if anticoagulant therapy is discontinued, and above which
the benefits provided by oral anticoagulants are outweighed by their risk.
Our model shows that for patients with a low hemorrhagic risk (0.5%/month), the benefit
yielded by oral anticoagulants breaks off beyond the 4th month of therapy, while patients
with moderate (1%/month) to high (2%/month) bleeding risk will no longer benefit from
the therapy after 3 or 2.5 months, respectively.
In conclusion, our model supports the validity of the usually recommended duration
of 3 months of oral anticoagulation after proximal vein thrombosis in the lower limbs,
but suggests that this duration should be modulated between 2.5 and 4 months depending
upon individual bleeding risk. Since clinical trials can hardly handle the complexity
of the addressed issue, such a model may prove very helpful in daily clinical practice.
