Summary
Immediate anticoagulant treatment is essential to reduce morbidity and mortality in
patients with acute venous thromboembolism (VTE). Currently, rapid anticoagulation
can only be achieved with parenteral anticoagulants, such as heparin or low-molecular-weight
heparin (LMWH).Weight-adjusted LMWH is the treatment of choice, because it produces
predictable anticoagulation and does not require coagulation monitoring. If heparin
is used, the activated partial thromboplastin time must be monitored and the heparin
dose adjusted to ensure a therapeutic level of anticoagulation. Heparin is recommended
for patients with renal impairment and for those at high risk of bleeding. The selective
factor Xa inhibitor fondaparinux is a recently introduced alternative to heparin or
LMWH for initial VTE treatment. Heparin, LMWH, or fondaparinux should be given for
at least five to seven days. Vitamin K antagonists should be initiated on the first
day, or as soon as possible, in patients who are candidates for an oral anticoagulant.
An oral anticoagulant agent to be used without laboratory monitoring for both acute
and long-term treatment of VTE remains an unsolved clinical need in the treatment
of VTE.
Keywords
Venous thromboembolism - deep vein thrombosis - pulmonary embolism - heparin - low-molecular-weight
heparin - anticoagulants