Thrombocytopenia during avacopan administration: A case report.
Int J Rheum Dis
; 26(8): 1603-1607, 2023 Aug.
Article
de En
| MEDLINE
| ID: mdl-36880594
ABSTRACT
Avacopan is a novel C5a receptor antagonist recently approved for the treatment of microscopic polyangiitis and granulomatosis with polyangiitis. To our knowledge, thrombocytopenia induced by avacopan has not been reported. We report a case of a 78-year-old man with microscopic polyangiitis who developed rapidly progressive glomerulonephritis (RPGN) and vasculitis neuropathy. After developing RPGN, he was treated with prednisolone, which was ineffective. As the dosage of corticosteroids was decreased, he developed impaired dorsiflexion of the left ankle, tingling and numbness in his feet, consistent with vasculitis neuropathy. After a 3-day administration of methylprednisolone, we started avacopan and prednisolone 20 mg/d to reduce the corticosteroid dosage. One week after starting avacopan, platelet counts began to decrease, eventually leading to the cessation of the drug. The possibility of thrombotic microangiopathy and heparin-induced thrombocytopenia was considered unlikely given the clinical course and laboratory studies. After 3 weeks of avacopan cessation, platelet counts began to increase, suggesting avacopan as the most probable cause of thrombocytopenia. Our case highlights the importance of postmarketing surveillance of avacopan to identify its adverse events that were not reported in clinical trials to ensure its safe use. Clinicians should carefully monitor platelet counts when using avacopan.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Thrombopénie
/
Granulomatose avec polyangéite
/
Vascularites associées aux anticorps anti-cytoplasme des neutrophiles
/
Polyangéite microscopique
Type d'étude:
Prognostic_studies
Limites:
Aged
/
Humans
/
Male
Langue:
En
Journal:
Int J Rheum Dis
Sujet du journal:
REUMATOLOGIA
Année:
2023
Type de document:
Article
Pays d'affiliation:
Japon