Resumen

PATINO-PEREIRA, Elieth; VALVERDE- MUNOZ, Kathia; GRANADOS-ALFARO, Paola  y  SANTAMARIA-QUESADA, Carlos. Congenital factor VII deficiency. Acta méd. costarric [online]. 2023, vol.65, n.2, pp.92-96. ISSN 0001-6002.  http://dx.doi.org/10.51481/amc.v65i2.1302.

Factor VII congenital deficiency is one of the most common congenital deficiencies of the blood system, with a worldwide prevalence of 1:300,000- 1:500,000. Here we describe a male patient, born by C section, with the family history of death at 4 days old of a sibling caused by intracranial hemorrhage, who presented bleeding at the umbilical cord site at 14 days old, even after falling of the cord. The initial assessment included laboratory tests with coagulation times revealing prolonged prothrombin time, with normal partial thromboplastin time as well as fibrinogen. The bleeding and the prolonged prothrombin time persisted despite the administration of vitamin K in three doses as well as fresh frozen plasma. Congenital defect of factor VII was suspected and later confirmed by measuring the factor. At the age of 2 months and 10 days, molecular studies based on next-generation massive sequencing (NGS) were performed. The analysis exhibited two heterozygous variants: F7, intron 5, c.430+1G>A y F7, intron 8, c.805+1G>A. Currently the patient is receiving prophylaxis 5 days per week with recombinant factor VII 200 µg/ day intravenous (280 µg/kg) with no recurrent bleeding.

Palabras clave : factor VII deficiency; intracranial hemorrhage; prothrombin time; genetic inheritance.

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