Antikoagulans Thrombophlebitis

Antikoagulans Thrombophlebitis

Lupus anticoagulant - Wikipedia Antikoagulans Thrombophlebitis Antikoagulans Thrombophlebitis The Lupus Anticoagulant - An Update


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Medical Director, Coagulation Laboratory. Lupus anticoagulants LA are a heterogeneous group of antibodies that cause a variety of clinical and laboratory effects. Many LA are discovered accidentally such as when a prolonged activated partial thromboplastin time APTT is found during a pre-operative evaluation. Often, Antikoagulans Thrombophlebitis are no clinical consequences other than the need to explain the reason for the long APTT.

A minority of Antikoagulans Thrombophlebitis with LA have a hypercoagulable state manifested by recurrent thromboses, multiple spontaneous miscarriages, migraine headaches, or stroke. Very rarely, Antikoagulans Thrombophlebitis, patients may have bleeding, Antikoagulans Thrombophlebitis.

LA have traditionally been classified as anti-phospholipid antibodies, but a more correct view is that they are antibodies directed against plasma proteins, which also bind to phospholipid surfaces. They Antikoagulans Thrombophlebitis usually IgG, IgM, or mixtures of both, Antikoagulans Thrombophlebitis, and frequently interfere with standard phospholipid-dependent coagulation tests. Importantly, the clotting test abnormalities caused by LA are in vitro phenomena; the antiphospholipid antibodies of the LA react with the Antikoagulans Thrombophlebitis preparations used to initiate clotting reactions.

In vivo clotting factor activities are not diminished and, except in extremely rare cases where there are specific antibodies directed against clotting factor Antikoagulans Thrombophlebitis, there is no danger of a bleeding diathesis.

It should also be recognized that most patients with Antikoagulans Thrombophlebitis do not have lupus erythematosus or other systemic autoimmune disorders. The exact etiology of LA is unclear. These antibodies are commonly found in asymptomatic elderly individuals.

A number of drugs, Antikoagulans Thrombophlebitis, most notably, procainamide, hydralazine, isoniazid, dilantin, phenothiazines, quinidine, and ACE inhibitors are known to induce LA. The majority of patients with drug-induced LA however, Antikoagulans Thrombophlebitis, have no systemic autoimmune disease or any other underlying disorder and have no clinical manifestations. Lupus anticoagulants and thrombosiS. Although only a minority of patients with LA present with recurrent episodes of thrombosis, LA are one of the most common acquired predisposing causes of thrombosis; they are associated with cerebral, deep venous, or renal vein thromboses, as well pulmonary emboli or arterial occlusions, particularly stroke.

There is also evidence that the type of recurrent thrombotic event, venous or arterial, tends to be persistent over time in the same patient. Lupus anticoagulants and Pregnancy. LA have clearly Antikoagulans Thrombophlebitis associated with an increased risk of fetal loss due to pre-eclampsia, placental abruption, intrauterine growth retardation, and stillbirth. Placental infarction has been suggested as the cause of the failure to carry to term but pathological analysis has not definitely supported this contention, Antikoagulans Thrombophlebitis.

Lupus anticoagulants and thrombocytopenia. An immune type thrombocytopenia has been observed in a small percentage of patients with LA; this may be due to reactions between antibodies and platelet membrane-associated phospholipids. No single test is definitive for a lupus anticoagulant. As a result, a variety of tests Antikoagulans Thrombophlebitis testing algorithms are used in an attempt to establish the diagnosis.

The typical screening test is a prolongation of the standard APTT that fails to correct when the patient's plasma is mixed with normal plasma, Antikoagulans Thrombophlebitis.

This suggests an inhibitor since normal plasma usually corrects any Antikoagulans Thrombophlebitis deficiency. However, this screening alone is inadequate to establish the presence of a LA because many affected patients, especially pregnant women, have normal APTT's. Conversely, occasional patients with a prolonged APTT that does not correct may have specific antibodies against individual clotting factors.

Thus, additional tests are needed both to establish and exclude the presence of a lupus anticoagulant. Standard clotting factor assays Antikoagulans Thrombophlebitis also be performed; they can differentiate LA from the more clinically dangerous specific antifactor antibodies such as anti-factor VIII antibody. All of the foregoing tests either directly measure antiphospholipid antibodies or manipulate the amount of active phospholipid available to initiate the clotting cascade.

When LA are found incidentally in asymptomatic patients, no therapy may be necessary, Antikoagulans Thrombophlebitis. In patients with drug-induced LA, discontinuing the agent will usually cause any Antikoagulans Thrombophlebitis clotting tests to revert to normal in weeks. When thrombotic patients who need anticoagulation with heparin have long APTT's due to a lupus anticoagulant, monitoring the heparin can be accomplished Antikoagulans Thrombophlebitis using the anti-factor Xa activity assay, which is usually used for the monitoring of low molecular weight heparin, Antikoagulans Thrombophlebitis.

Several studies of small groups of non-randomized patients suggest that a combination of aspirin and prednisone or heparin alone may result in successful term pregnancy in women with recurrent fetal loss.

However, no randomized study has established the usefulness of either regimen. LA Antikoagulans Thrombophlebitis influence the recommendation for the duration or intensity of anticoagulant therapy in patients with thrombotic events, Antikoagulans Thrombophlebitis. If a LA, present initially, persists after a standard course of anticoagulation in a patient with thrombosis, continued anticoagulation is usually recommended for Antikoagulans Thrombophlebitis least three additional months when repeat testing for the LA is again performed.

If the LA disappears, Antikoagulans Thrombophlebitis, anticoagulation may be discontinued; if it remains, indefinite anticoagulation is usually recommended because of a high recurrent thrombotic risk, Antikoagulans Thrombophlebitis.

Higher intensity INR ranges of 2. Attempting to suppress any undefined underlying Antikoagulans Thrombophlebitis process with prednisone in patients with LA to lower thrombotic risk has not been shown to be effective and is currently not recommended.

Copies of previous Transfusion Medicine Update issues can be obtained from our web page: To be placed on our mailing list for a hard copy, please contact Deborah Small by e-mail: Lupus anticoagulants and thrombosiS Although only a minority of patients with LA present with recurrent episodes of thrombosis, LA are one of the most common acquired predisposing causes of thrombosis; they are associated with cerebral, deep venous, or renal vein thromboses, Antikoagulans Thrombophlebitis, as well pulmonary emboli or arterial occlusions, particularly stroke, Antikoagulans Thrombophlebitis.

Lupus anticoagulants and thrombocytopenia An immune type thrombocytopenia has been observed in a small percentage of patients with LA; this may be due to reactions between antibodies and platelet membrane-associated phospholipids. Laboratory Diagnosis No single test is definitive for a lupus anticoagulant.

Management When LA are found incidentally in asymptomatic patients, no therapy may be necessary.


Lupus Anticoagulant Syndrome - Symptoms, Treatment, Hereditary, Pregnancy

Oct 30, Author: In general, healthy subjects do not have a prolonged aPTT Antikoagulans Thrombophlebitis do not have lupus Antikoagulans Thrombophlebitis LA activity. LA activity is identified by in vitro prolongation of clotting time in coagulation assays, Antikoagulans Thrombophlebitis. In fulfillment of the first criteria, the aPTT is one of the most commonly used coagulation assays to screen for LA. However, sensitivity in standard commercial preparations varies.

Other authors argue that a single aPTT using a reagent that is not optimally sensitive may suffice to diagnose LA, provided that its positivity is documented on 2 separate occasions, Antikoagulans Thrombophlebitis. Regardless of the aPTT reagent used, interpretation of a prolonged aPTT in evaluation of LA activity must involve further tests to fulfill the aforementioned mentioned criteria to confirm the presence of LA.

This is based on evidence showing that no single test is sensitive Antikoagulans Thrombophlebitis detecting all LA. However, Antikoagulans Thrombophlebitis, the risk of false-positive results increases to an unacceptable level if more Antikoagulans Thrombophlebitis 2 screening tests are performed, Antikoagulans Thrombophlebitis.

A positive finding demonstrates persistence of a prolonged aPTT after the mixing study. In a hospitalized setting, the presence of heparin in the serum must be excluded prior to mixing and is usually done by performing a thrombin time TT, Antikoagulans Thrombophlebitis. However, less experience and literature is available on low molecular weight heparins LMWHfactor Xa inhibitors, or direct thrombin inhibitors. Elucidating the character of the inhibitor is the next step after Antikoagulans Thrombophlebitis its presence.

For LA, demonstrating how its activity specifically depends on phospholipid concentration is key. This can be done in 2 ways, Antikoagulans Thrombophlebitis. The first method involves accentuating prolonged coagulation by reducing the amount of phospholipid, as is done in the tissue thromboplastin inhibition TTI test and the dilute aPTT test. The second and more sensitive method is to neutralize the inhibitor activity by increasing the Antikoagulans Thrombophlebitis of phospholipid, as is done in the platelet neutralization procedure PNP or the rabbit brain neutralization procedure RBNP.

The Antikoagulans Thrombophlebitis recommends the use of hexagonal phase phospholipids to increase phospholipid concentrations because studies have shown LA inhibitors are able to differentiate between lamellar and hexagonal phospholipid configurations. After confirming phospholipid dependence, the coexistence of a specific factor inhibitor, specifically factor VIII inhibitor, is excluded with an inhibitor assay. Although this occurrence is rare, failure to exclude such may result in catastrophic bleeding.

Patients who receive a positive result while being evaluated for antiphospholipid antibody Antikoagulans Thrombophlebitis APS must have repeat LA testing after 12 weeks to establish Antikoagulans Thrombophlebitis diagnosis according to current criteria. Studies suggest that when LA is detected at 2 separate time intervals 12 weeks apart, Antikoagulans Thrombophlebitis, a statistically significant association can be shown with prior thromboembolic events and fetal loss.

The specimen is blood, Antikoagulans Thrombophlebitis. No specific patient preparation is needed. Optimally, Antikoagulans Thrombophlebitis, the sample should not be collected after a meal because lipemia varicosity dekompensierter interfere with photometric measurements of clot formation, Antikoagulans Thrombophlebitis.

Moreover, the sample should not be drawn from an Antikoagulans Thrombophlebitis with a heparinized catheter or a heparin lock. Blood is drawn into a light blue top tube containing nM 3. The tube has a specified filling volume to ensure sample collection in 9: Samples should be tested Antikoagulans Thrombophlebitis 4 hours of specimen collection.

Sending the sample on ice will activate clotting and may result in falsely shortened clotting times. This is accomplished by centrifugation at g for 15 min at room temperature. Most institutions, including the ISTH, recommend centrifuging twice to ensure the absence of platelet-factor-4, which can potentially activate clotting prematurely, Antikoagulans Thrombophlebitis.

LA is an antibody that prolongs phospholipid dependent coagulation tests in vitro. The existence of this antibody was first demonstrated in by Conley Eine frühzeitige Diagnose von Krampfadern Hartmann when they observed prolongation of lipid dependent coagulation tests in patients with systemic lupus erythematosus SLE.

Although the initial reports of the clinical manifestations of patients with circulating LA described bleeding tendencies, subsequent studies showed that bleeding only manifested when other hemostatic defects were present. InHughes described in full detail a syndrome of thromboses or recurrent pregnancy losses occurring in patients with laboratory evidence of antibodies against anionic phospholipids.

As such, he termed the syndrome as anticardiolipin syndrome. This was later renamed Antikoagulans Thrombophlebitis antiphospholipid antibody syndrome APS when it became apparent that LA can be present in these patients and was also directed at these phospholipids. Gharavi et al later described induction of antiphospholipid antibodies with immunization with Betaglycoprotein-1 B2GP1. High titers of these antibodies have also been linked to thrombosis and fetal wastage.

Three major antibodies have thus been linked to the clinical syndrome of APS and an international consensus statement on diagnostic criteria was proposed in and revised in and again in The updated international consensus statement on classification criteria for definite APS diagnosis requires one Antikoagulans Thrombophlebitis the following clinical criteria and one of the Antikoagulans Thrombophlebitis criteria to be met: Between LA and anticardiolipin, the former has been shown to be more specific and predictive for the occurrence of thromboses and pregnancy morbidity.

A meta-analysis of the risk of venous thrombosis in patients with antiphospholipid antibodies without a previous thrombotic episode or an underlying autoimmune disorder showed that the mean odds ratio was 11 for LA and 3. No contraindications are noted; however, the ISTH discourages nonspecific testing in asymptomatic individuals not otherwise described above. Perhaps the single most Antikoagulans Thrombophlebitis variable in the detection of LA activity is the preparation of platelet poor plasma.

With the exception of the clotting time, the sensitivity of all other screening tests is inversely proportional to the residual platelets in the plasma tested.

Platelet poor plasma with significant residual platelets may demonstrate shortened clotting times on freezing and thawing due to inadvertent platelet neutralization effect. Interpretation of LA testing results can be difficult because of prolonged baseline clotting times while the international normalized ratio INR is therapeutic. If determination of LA activity is an indication to continue vitamin K antagonist VKA therapy, some authors attest brief discontinuation of a VKA for diagnostic procedures is not a high-risk option in most instances.

If the INR is 1. Evaluating for LA Antikoagulans Thrombophlebitis proximity to an acute thrombotic event can be problematic for two reasons. First, Antikoagulans Thrombophlebitis, most patients are anticoagulated either by therapeutic doses of heparin or VKAs.

Second, acute phase reactants like factor VIII may be increased during and also interfere with interpretation of results. The ITSH advises caution in interpretation of results under these circumstances, Antikoagulans Thrombophlebitis. Update of the guidelines for lupus anticoagulant detection. Activated partial thromboplastin time reagent sensitivity to the presence of the lupus anticoagulant, Antikoagulans Thrombophlebitis.

Arch Pathol Lab Med. The diagnosis Antikoagulans Thrombophlebitis lupus anticoagulants by the activated partial thromboplastin time--the central role of phosphatidyl serine. International consensus statement on an update of the classification criteria for definite antiphospholipid syndrome APS.

Kaolin clotting time Antikoagulans Thrombophlebitis dilute Russell's viper venom time distinguish between prothrombin-dependent and beta 2-glycoprotein I-dependent antiphospholipid antibodies.

Guidelines on the investigation and management of antiphospholipid syndrome. Human hybridoma lupus anticoagulants distinguish between lamellar and hexagonal phase lipid systems.

Simultaneous occurrence of lupus anticoagulant and factor VIII inhibitors. Relationship of antiphospholipid Antikoagulans Thrombophlebitis to pregnancy loss in patients with systemic lupus erythematosus: The relationship of antiphospholipid antibodies to thromboembolic disease in systemic lupus erythematosus: Studies on the initiation of blood coagulation, Antikoagulans Thrombophlebitis, III.

The clotting properties of canine platelet-free plasma. Acquired inhibitors of blood coagulation. Thrombosis Antikoagulans Thrombophlebitis systemic lupus erythematosus despite circulating anticoagulants. J Lab Clin Med. Intrauterine death and circulating anticoagulant "antithromboplastin". Thrombosis, abortion, cerebral disease, and the lupus anticoagulant. Induction of antiphospholipid autoantibodies by immunization with beta 2 glycoprotein I apolipoprotein H. Am J Reprod Immunol.

Association of anti-beta 2 glycoprotein I antibodies with lupus-type circulating anticoagulant and thrombosis in systemic lupus erythematosus. International consensus statement on preliminary classification criteria for definite antiphospholipid syndrome: Recent guidelines and recommendations for laboratory detection of lupus anticoagulants. Commonalities and contrasts in recent guidelines for lupus anticoagulant detection. Int J Lab Hematol, Antikoagulans Thrombophlebitis.

Meta-analysis of the risk of venous thrombosis in individuals with antiphospholipid antibodies without underlying autoimmune disease or previous thrombosis. Brey RL, Escalante A, Antikoagulans Thrombophlebitis. Neurological manifestations of antiphospholipid antibody syndrome. Determining the effect of freezing on coagulation testing: False-positive Antikoagulans Thrombophlebitis anticoagulant in patients receiving rivaroxaban: Sign Up It's Free!

If you log out, you will be required to enter your username sekstafag trophischen Geschwüren password the next time you visit. Share Email Print Feedback Close. Full-infant age, d — seconds. Full-term infant age, 6 d to 3 mo — seconds. Older than 3 months and adults — seconds.

Interpretation LA activity is identified by in vitro prolongation of clotting time in coagulation assays. Evidence of inhibitory activity through a mixing study, Antikoagulans Thrombophlebitis. Demonstration of phospholipid-dependence of the inhibitor. Exclusion of a coexisting specific coagulation factor inhibitor. Collection and Panels The specimen is blood. Fill the tube to the indicated optimum amount and never under the minimum amount, allowing Antikoagulans Thrombophlebitis of ratio of blood to anticoagulant, Antikoagulans Thrombophlebitis.

Gently mix the sample to distribute the anticoagulant throughout the sample and prevent premature clotting. Never combine two under filled tubes to make one tube.


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