[Clinical facets of hereditary angioedema among Swiss patients]

Hereditary angioedema (HAE) is a rare, autosomal dominant disease due to functional deficiency of C1-esterase inhibitor (C1-INH). In this observational study anamnestic, clinical and treatment data from forty patients were retrospectively analysed. Thirty nine of the patients suffered from type I of HAE and one patient from type II. Between first manifestation of the disease and correct diagnosis a median time lag of 10 years was observed. Two C1-INH deficient individuals had no symptoms so far; 36 patients suffered from recurrent, self-limiting abdominal attacks (convulsion, vomiting and diarrhea); 32 patients presented with edema of the (sub-) cutis. Thirty percent of swelling attacks involved the upper respiratory tract and two larynx attacks needed intubation. Hormonal changes in 25% of the female patients were associated with an aggravation of the attacks. Long-term therapy was established in 19 patients; treatment of acute attacks was performed in 10 patients and 11 patients needed no therapy.