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1.

Thrombophilia due to activated protein C resistance

Factor V Leiden thrombophilia is characterized by a poor anticoagulant response to activated protein C (APC) and an increased risk for venous thromboembolism (VTE). Deep venous thrombosis (DVT) is the most common VTE, with the legs being the most common site. Thrombosis in unusual locations is less common. Evidence suggests that a heterozygous factor V Leiden mutation has at most a modest effect on recurrence risk after initial treatment of a first VTE. Heterozygosity for factor V Leiden is associated with a two- to threefold increase in relative risk for pregnancy loss, and possibly other pregnancy complications such as preeclampsia, fetal growth retardation, and placental abruption. The clinical expression of factor V Leiden thrombophilia is influenced by: The number of factor V Leiden alleles (heterozygotes have a slightly increased risk for venous thrombosis; homozygotes have a much greater thrombotic risk); Coexisting genetic thrombophilic disorders, which have a supra-additive effect on overall thrombotic risk; Acquired thrombophilic disorders: antiphospholipid antibodies, hyperhomocysteinemia, high factor VIII levels, malignancy; and Circumstantial risk factors: travel, central venous catheters, pregnancy, oral contraceptive use, hormone replacement therapy (HRT), selective estrogen receptor modulators (SERMs), organ transplantation, advancing age, and surgery. [from GeneReviews]

MedGen UID:
396074
Concept ID:
C1861171
Disease or Syndrome
2.

Resistance to activated protein C

Poor anticoagulant response to activated protein C. A plasma is termed 'APC resistant' when the addition of exogenous APC fails to prolong its clotting time in an activated partial thromboplastin time assay. [from HPO]

MedGen UID:
109068
Concept ID:
C0600433
Disease or Syndrome

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