Hereditary and Acquired Hypercoagulability Treatment & Management
- Author: Paul Schick, MD; Chief Editor: Srikanth Nagalla, MBBS, MS, FACP more...
The goal of this article is not to review the management of thrombotic episodes, which is described in Deep Venous Thrombosis and Pulmonary Embolism. Management of specific prothrombotic disorders is detailed in the following Medscape reviews:
However, indications for anticoagulation to prevent thromboembolism in patients at risk should be considered (ie, primary anticoagulation or prophylaxis). Indications for primary prophylaxis include the following:
Certain orthopedic disorders
Primary prophylaxis in patients with thrombophilia during pregnancy is controversial. Patients with thrombophilia, a history of thrombosis, and other risk factors could be considered for prophylactic anticoagulation, especially during the first 6 weeks postpartum, when the risk of thrombosis is greatest. Anticoagulation should be strongly considered during pregnancy and in the postpartum period in patients with lupus anticoagulants.
A multicenter study of 2554 patients revealed that after a first unprovoked venous thromboembolism (VTE), men have a 2.2-fold higher risk of recurrent VTE than do women; this risk remained 1.8-fold higher in men after adjustment for previous hormone-associated VTE in women. In patients with a first provoked VTE, risk of recurrence does not differ between men and women, with or without adjustment for hormone-associated VTE. This information might be useful when deciding on whether long-term anticoagulation is indicated.
Patients who have a venous thrombotic event or pulmonary embolus should be anticoagulated (secondary anticoagulation). Warfarin, heparin, and low molecular weight heparin (LMWH) have been used to manage venous thrombosis and pulmonary embolism. The direct oral anticoagulants (direct thrombin and direct Xa inhibitors) have become widely used for the treatment of VTE.
The decision to institute long-term or extended anticoagulation is complex, and it should be based on evidence of recurrent thrombosis and the assessment of all risk factors. The benefits of anticoagulation must outweigh the risk of bleeding, especially in elderly patients.
Some organizations recommend that patients with lupus anticoagulants be treated more aggressively. For example, the American College of Chest Physicians recommends 12 months of anticoagulation and consideration of long-term anticoagulation after a single thrombotic event in patients with antiphospholipid syndrome.
Recommendations conflict on the optimal international normalized ratio (INR) level in patients with lupus anticoagulants who are on warfarin. In most cases, an INR of 2.0 to 3.0 is adequate. However, a higher INR might be desirable in patients with severe recurrent thromboembolic disease.
The risk of thrombosis should outweigh the risk of bleeding, especially in older patients, when deciding on anticoagulation.
Thrombin Inhibitors and Factor Xa Inhibitors
Direct factor Xa inhibitors (rivaroxaban, apixaban and edoxaban) and direct thrombin inhibitors (dabigatran), especially oral agents, have been developed as alternatives to warfarin. They have been approved for use in VTE prophylaxis, VTE treatment, and stroke prevention in non-valvular atrial fibrillation. In patients with heparin-induced thrombocytopenia, fondaparinux, a long-acting anti-Xa agent, is thought to have advantages over the short-acting antithrombin agents argatroban and bivalirudin.
Direct oral anticoagulants have several possible advantages over warfarin, including the following:
No or limited interaction with other drugs and diet
Metabolic half-lives that allow for once- or twice-daily dosing
No need to monitor due to predictable pharmacokinetics
Possibly less bleeding complications
However, continued evaluation of the value of direct oral anticoagulants in complex thrombotic syndromes (eg, antiphospholipid antibody syndrome) and cancer patients is important before these agents are widely used in these complex cases.
Considerable efforts have recently been made to evaluate the role of oral and parenteral thrombin inhibitors and Xa inhibitors in preventing and managing thrombosis. The value of combining these agents with traditional warfarin and heparin therapy has been assessed. Disparate clinical settings such as patients with cancer, elderly patients, pregnancy, coronary artery disease, and surgical patients were studied. Although these studies have provided new information, many of them concluded that more information was needed to safely use new and standard anticoagulation therapy to provide optimal thrombosis prevention and management. these agents.[26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36]
Hospital formularies will be challenged to appropriately use and manage these new medications. The introduction of new-generation anti-Xa and direct thrombin inhibitors in patients receiving antiplatelet therapy was associated with a dramatic increase in major bleeding events.
A hematologist experienced in the diagnosis and management of thrombophilias and hypercoagulable disorders should be consulted. Equally important is that the laboratory evaluations for thrombophilia are carried out in laboratories with extensive experience with these tests.
Monitoring of Anticoagulation and Management of Bleeding
Unfractionated heparin therapy is monitored by measuring aPTT. Warfarin therapy is monitored by measuring PT (INR). The therapeutic ranges for heparin and warfarin are well established. However, the therapeutic ranges of direct thrombin and direct Xa inhibitors are not known.
In general, LMWHs are administered without routine laboratory monitoring because the dosage effects are fairly consistent. The most common method for monitoring LMWH is a chromogenic assay for anti–factor Xa activity. This assay does not accurately estimate risk for bleeding or whether anticoagulation is sufficient to prevent thrombosis.
In practice, monitoring of LMWH is complicated by several factors. The formulations available for clinical use vary in their composition and relative amounts of anti–factor IIa and anti–factor Xa activity. The optimal anti–factor Xa levels vary among these preparations. Thus, the physician must understand the characteristics of the LMWH being prescribed.
The peak plasma concentrations are achieved at periods of about 4 hours following subcutaneous administration, and this is the time at which blood is usually drawn for monitoring. However, because of different dosage regimens (once or twice daily) and the possibility of different clearance rates, there is no perfect method for the optimum timing of monitoring or determination of desired target levels.
Moreover, standardization of the chromogenic assay for anti–factor Xa activity from different providers and in different laboratories is not yet ideal. Although high doses of LMWH are considered to pose a greater risk of bleeding, no correlation has been shown between anti–factor Xa activity levels and actual incidence of bleeding in patients. Likewise, the assay has limited predictive value for predicting antithrombotic efficiency.
Guidelines for monitoring of LMWH have been issued by the American College of Chest Physicians and the British Committee for Standards in Haematology. Both organizations indicate that routine monitoring is unnecessary for most patients. However, monitoring to be ascertain that no excess heparin accumulates in the blood should be conducted in patient subgroups such as the following:
Overweight and underweight individuals
Patients with reduced creatinine clearance
Patients undergoing prolonged therapy (eg, for cancer)
Pregnant women (especially in the third trimester)
Monitoring thrombin inhibitors
The Ecarin clotting time (ECT), activated clotting time, and activated factor X tests have been used to monitor antithrombin agent therapy. The Ecarin clotting time is thought to be the most reliable test, but further clinical experience with this assay would be important to establish a more complete track record. Unfortunately, the Ecarin clotting time is not available at most medical centers.
Reversal of anticoagulation
A major consideration in the administration of anticoagulants is the reversal of anticoagulation in patients who bleed. All currently available anticoagulants carry similar risks of serious bleeding episodes. Unfractionated heparin is readily reversible with protamine, but protamine carries some risk of hypotensive and anaphylactic reactions. Warfarin can be reversed in a short time by the administration of fresh frozen plasma, but reversal with vitamin K can take several hours.
Protamine has limited ability to reverse bleeding due to LMWH. Reversal agents such as low molecular weight protamines and cationic concatemeric peptides are under investigation but have not yet entered clinical use.
No antidote for factor Xa inhibitors (eg, fondaparinux, rivaroxaban) is currently available. The long half-lives of LMWH and fondaparinux and the possibility of continued release into the circulation from the site of subcutaneous injection further complicates the reversal process.
Likewise, no antidotes are available for lepirudin, bivalirudin, and argatroban, or for the oral direct thrombin inhibitors that are currently in clinical trials.
Recombinant factor VIIa has been proposed as a reversal agent for patients who bleed while undergoing anticoagulation. However, as yet there have been no controlled studies to determine its efficacy. Thrombosis may be a significant risk of recombinant factor VIIa therapy.
In summary, it has been proposed that monitoring LMWH and direct thrombin inhibitors is not necessary since their effects are predictable. This recommendation is in part due to the lack of reliability or unavailability of the tests for monitoring LMWH and thrombin inhibitors. For example, factor Xa levels are not reliable for determining whether the level of anticoagulation is sufficient to prevent thrombosis, as well as not reliable for predicting the risk for bleeding.
The inadequacy of monitoring tests and the fact that antidotes are not available places patients who bleed at considerable risk, especially because some of the LMWH and thrombin inhibitors have a long half-life. The reversal of bleeding due to LMWH and thrombin inhibitors, especially if the agent has a long half-life, has been difficult.
Recent developments in monitoring thrombin and Xa inhibitors and in developing antidotes
There has been progress in developing antidotes to direct thrombin and factor Xa inhibitors. Idarucizumab, a humanized monoclonal antibody that binds to and inactivates dabigatran, has received expedited approval from the US Food and Drug Administration (FDA).
Andexanet alfa is a genetically engineered factor Xa molecule that has no procoagulant activity but can bind with and neutralize both direct factor Xa inhibitors (eg, rivaroxaban, apixaban, edoxaban) and the factor Xa inhibitors that act through antithrombin (LMWHs and fondaparinux). A phase 3b–4 study of andexanet for treatment of acute major bleeding in patients receiving a factor Xa inhibitor is currently recruiting participants.
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|Condition||Prevalence in General Population (%)||Relative Risk of VTE (%)||Relative Risk of Recurrent VTE (%)|
|Factor V Leiden
|Protein C deficiency
|Protein S deficiency
|VTE = Venous thromboembolism|