Post-authorization safety study of Clottafact(®) , a triply secured fibrinogen concentrate in congenital afibrinogenemia. A prospective observational study.

Background and ObjectivesA new fibrinogen concentrate Clottafact((R)) was developed according to European guidelines on plasma-derived products. A post-authorization safety study was set up in 2009 as part of the risk management plan. This was a non-interventional, prospective, non-comparative, multicenter study of the use of fibrinogen concentrate for congenital afibrinogenemia in real-life medical practice in France. Materials and MethodsThe analysis was descriptive and performed on 3 subgroups: prophylaxis vs. on-demand treatment, age (<6, <12 and 12) and severity of the deficiency. ResultsFourteen patients [1-78years] were included in 7 centres and followed for 1year. Twenty-one adverse drug reactions (ADRs) classically reported with fibrinogen (pallor, chills, cough, vomiting, headache, urticaria and erythematous rash) were reported in 5 of 14 patients. Two ADRs were serious: an anaphylactic shock and a subclavian venous thrombosis with a favourable outcome without sequelae. In the nine patients under prophylaxis, 365 of 367 infusions were considered as successful (995%) and 2 as failures. For the five patients treated on-demand, the efficacy was rated as excellent for 27 of 48 infusions and good for the 21 others. ConclusionThis study confirms that the benefit/risk balance for this fibrinogen concentrate is favourable.