Afibrinogenemia: congenital
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Very rare: 1 to 2 cases per million. Autosomal recessive transmission.
The severity of clinical manifestations is variable depending on whether it is a - or hypofibrinogenemia or dysfibrigenemia:
- bleeding at the fall of the umbilical cord in 85 % of cases
- intracranial hemorrhage
- frequent epistaxis, mucosal bleeding, post-traumatic hematomas
- hemarthroses
- sometimes no clinical symptoms.
Diagnosis: strongly abnormal clotting tests (APTT, INR) and dosage of fibrinogen.
Anesthetic implications:
administer fibrinogen (30-100 mg/kg) in order to obtain a blood level greater than 100 mg/100 ml: one usually needs 30 mg/kg to increase the fibrinogen concentration up to 100 mg/100 ml; if no fibrinogen is available, fresh frozen plasma may be used instead. Dynamic monitoring of coagulation (thromboelastography: ROTEM® ); it is useful to administer an antifibrinolytic (tranexamic acid: 25 mg/kg/6 h orally or 10mg/kg/6 h IV). Warning: 20 to 30 % of those patients have a paradoxal thrombophilia and must be closely monitored in the postoperative period (risk of thromboembolic event ?).
References :
Updated June 2019