[Warfarin desensitization. A case report]

Rev Alerg Mex. Jan-Mar 2021;68(1):80-83. doi: 10.29262/ram.v68i1.855.
[Article in Spanish]

Abstract

Background: Warfarin is an oral anticoagulant which is widely used in the prevention and treatment of thromboembolic events, to which multiple adverse effects are attributed; nevertheless, descriptions of hypersensitivity reactions to this medication are rare.

Case report: A 59-year-old patient with a history of mesenteric thrombosis, who had previously received long-term treatment with warfarin. Upon discontinuation of the medication, the patient experienced a recurrence of thrombosis at a hepatosplenic level, with a subsequent hypersensitivity reaction upon administration of the coumarin. It was decided that treatment with warfarin should be continued as it was considered the best therapeutic option, which is why a rapid desensitization protocol was carried out.

Conclusion: Hypersensitivity reactions to warfarin are rare; we propose the option of a desensitization protocol for patients who require this medication as long as the clinical benefit is considered greater than the reaction.

Antecedentes: La warfarina es un anticoagulante oral ampliamente utilizado en la prevención y tratamiento de patologías tromboembólicas, a la cual se le atribuyen múltiples efectos adversos; no obstante, las descripciones de reacciones de hipersensibilidad son infrecuentes con este medicamento. Caso clínico: Paciente de 59 años, con antecedente de trombosis mesentérica, quien previamente recibió tratamiento prolongado con warfarina. Al suspender el medicamento, el paciente presentó recurrencia de trombosis a nivel hepatoesplénico y al reiniciar el cumarínico mostró reacción de hipersensibilidad. Se decidió continuar el tratamiento con warfarina por considerar que se trataba de la mejor opción terapéutica, motivo por el cual se realizó protocolo de desensibilización rápida. Conclusión: Las reacciones de hipersensibilidad con warfarina son infrecuentes; planteamos la opción de protocolo de desensibilización en pacientes que ameriten este medicamento cuando se considere mayor el beneficio clínico.

Keywords: Allergy; Desensitization; Hypersensitivity; Warfarin.

Publication types

  • English Abstract