Assessment of disease activity and quality of life in patients with recurrent bradykinin-mediated versus mast cell-mediated angioedema

Abstract

Objective: Recurrent Angioedema (RAE) is characterized by sudden swelling of mucosal surfaces or deep dermis and is either mast cell-(MMAE) or bradykinin-mediated (BMAE). How patients with BMAE and MMAE differ in terms of disease activity and impact remains largely unknown. Here, we determined validity, reliability, and sensitivity to change of Turkish versions of angioedema activity score (AAS) and quality of life questionnaire (AE-QoL) and used both instruments to investigate and compare patients with BMAE and MMAE. Methods: Turkish versions of AAS28 and AE-QoL were applied to 94 patients with RAE (18-72 years). Patients' global self-assessment of QoL (PGA-QoL), disease activity (PGA-DA-VRS, PatGA-DA-VAS), and 12-Item-Short Form Survey were used at week 4 (visit 2), and week 8 (visit 3). De-mographic characteristics, clinical features, and AAS28 and AE-QoL values were compared be-tween 31 patients with BMAE and 63 patients with MMAE. Results: Turkish AAS28 and AE-QoL showed excellent internal consistency, high reproducibility and known-groups validity. Compared to patients with MMAE, BMAE patients were younger (34.6 +/- 10.7 vs. 40.7 +/- 13.3 years), had longer disease duration (236 +/- 178 vs. 51 +/- 78 months), high prevalence of family history (63% vs 14%), longer duration of attacks (65 +/- 20 vs. 40 +/- 25 h), and they were more commonly affected by upper airway angioedema (70% vs 23%). Disease activity (AAS28) was lower (29.3 +/- 24.6 vs 55.2 +/- 52.9), but AE-QoL was higher (44.2 +/- 16.1 vs 34.5 +/- 22.5) in BMAE patients as compared to MMAE patients. Conclusions: Patients with BMAE and MMAE have distinct disease characteristics. Recurrent bradykinin-mediated angioedema impacts quality of life more than mast cell-mediated angioe-dema. The discriminating characteristics of patients with BMAE and MMAE may help to improve the diagnosis and management of patients with RAE.