History
- Symptoms of factor V deficiency include the following:
- Bleeding into the skin
- Excessive bruising with minor injuries
- Nosebleeds
- Bleeding gums
- Excessive menstrual bleeding and prolonged or excessive loss of blood with surgery or trauma
- Bleeding in mucosal tracts (gastrointestinal, urinary)
- Hemarthrosis and flexion contracture
- Bleeding during delivery and postpartum
- Intracerebral hemorrhages
- Pulmonary hemorrhage
- The severity of bleeding symptoms is only partially related to the degree of factor V deficiency in plasma from immeasurable plasma levels.
Physical
The most common physical findings of factor V deficiency are ecchymoses, bleeding from mucosal surfaces, and pallor secondary to blood loss. Petechiae are uncommon because platelet numbers and function are not affected.
Causes
Factor V deficiency is caused by a large number of genetic abnormalities. The deficiency is a rare bleeding disorder whose genetic bases have been characterized in only a limited number of cases. The inheritance of factor V deficiency is autosomal recessive, with varying expressivity in the heterozygote; however, other modes of inheritance have been described. Heterozygotes have lowered levels of factor V but probably never bleed abnormally.
Consanguinity has been observed in families with factor V deficiency, related to its autosomal recessive inheritance. Heterozygous deficiency states are generally unrecognized because of a lack of significant clotting time prolongation or bleeding risk.
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