Idiopatic angioedema treated with dapsone.

Area of Science:

• Allergy and Immunology
• Dermatology
• Internal Medicine

Background:

• Idiopathic angioedema presents diagnostic and therapeutic challenges, with conventional treatments like antihistamines and corticosteroids often proving ineffective.
• Identifying causative agents is crucial, but many cases remain idiopathic, necessitating exploration of alternative therapeutic regimens.

Observation:

• A 48-year-old male experienced recurrent severe angioedema affecting the lips, tongue, and throat, with laryngeal edema noted on fiberoptic examination.
• Extensive allergy testing and laboratory investigations, including autoimmune markers and complement studies, were negative, ruling out common causes and hereditary angioedema.
• Initial treatment with antihistamines and corticosteroids yielded no improvement, prompting the initiation of dapsone therapy.

Findings:

• The patient demonstrated significant clinical improvement with daily dapsone (50 mg), leading to the successful withdrawal of antihistamines and corticosteroids.
• No adverse events or hematologic abnormalities were observed during the treatment period and subsequent follow-up.
• Dapsone therapy resulted in complete resolution of angioedema episodes for over a year.

Implications:

• Dapsone represents a promising alternative therapeutic option for patients with severe idiopathic angioedema refractory to standard treatments.
• This case underscores the importance of considering novel therapeutic strategies for challenging angioedema cases.
• Further research into the efficacy and safety of dapsone in idiopathic angioedema is warranted.