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Blood, 1 May 2002, Vol. 99, No. 9, pp. 3102-3110
HOW I TREAT
How we diagnose and treat deep vein thrombosis
Jack Hirsh and
Agnes Y. Y. Lee
From the Henderson Research Centre, and the Department
of Medicine, McMaster University, Hamilton, Ontario, Canada
Making a diagnosis of deep vein thrombosis (DVT) requires both
clinical assessment and objective testing because the clinical features
are nonspecific and investigations can be either falsely positive or
negative. The initial step in the diagnostic process is to stratify
patients into high-, intermediate-, or low-risk categories using a
validated clinical model. When the clinical probability is intermediate
or high and the venous ultrasound result is positive, acute symptomatic
DVT is confirmed. Similarly, when the probability is low and the
ultrasound result is normal, DVT is ruled out. A low clinical
probability combined with a negative D-dimer result can also be used to
rule out DVT, thereby obviating the need for ultrasonography. In
contrast, when the clinical assessment is discordant with the results
of objective testing, serial venous ultrasonography or venography is
required to confirm or refute a diagnosis of DVT. Once a patient is
diagnosed with an acute DVT, low-molecular-weight heparin (LMWH) is the
agent of choice for initial therapy and oral anticoagulant therapy is
the standard for long-term secondary prophylaxis. Therapy should
continue for at least 3 months; the decision to continue treatment
beyond 3 months is made by weighing the risks of recurrent thrombosis
and anticoagulant-related bleeding, and is influenced by patient
preference. Screening for associated thrombophilia is not indicated
routinely, but should be performed in selected patients whose clinical
features suggest an underlying hypercoagulable state. Several new
anticoagulants with theoretical advantages over existing agents are
undergoing evaluation in phase 3 studies in patients with venous thromboembolism.

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