DefinitionThis section has been translated automatically.
Autosomal-dominant disorder of anticoagulation with increase of prothrombin fragments 1 and 2 in plasma.
ClassificationThis section has been translated automatically.
A distinction is made:
- an antithrombin deficiency of type 1: activity and concentration are equally prevented.
- Type 2 antithrombin deficiency: the activity is reduced and the concentration normal or slightly increased.
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Occurrence/EpidemiologyThis section has been translated automatically.
The prevalence is 1 per 5000 in the population. Only heterozygous carriers are known.
EtiopathogenesisThis section has been translated automatically.
Antithrombin III is an important regulator protein of plasmatic coagulation by inhibiting the serine kinases of the intrinsic system. The effect on the individual factors varies. Antithrombin III exerts the strongest inhibitory effect on thrombin and factor Xa.
The concentration in plasma is 0.14-0.39 g/l. The activity is 70-120% of the norm. Even a reduction of the antithrombin III activity to about 50% is associated with an increased coagulatory activity, which in turn is associated with an increased risk of thromboembolic events.
Clinical featuresThis section has been translated automatically.
50% of feature carriers have already experienced thromboembolic complications before the age of 40. The thromboses mostly occur in the veins of the lower extremities. However, mesenteric and renal thromboses and thromboses of the vena cava also occur. Arterial thromboses have not been observed in cases of antithrombin deficiency.
Note(s)This section has been translated automatically.
In 1963 Egberg was the first to identify a disorder of AT-III as the cause of thrombophilia. 1983 the first specific mutation of antithrombin III was described. In the meantime, over 120 different mutations are known.
LiteratureThis section has been translated automatically.
- HA Neumann (2014) The coagulation system. ABW-Wissenschaftsverlag GmbH Berlin S. 223f.
Incoming links (1)Antithrombin iii deficiency acquired;
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