The Disease Burden and Societal Costs of Hereditary Angioedema.

Background: According to the current treatment guidelines, the goals of treatment of patients with hereditary angioedema (HAE) are to achieve total control of the disease and to normalize patients' lives.

Objective: This study aims to establish the entire burden of HAE comprising disease control, treatment satisfaction, reductions in quality of life, and societal costs.

Methods: Adult patients with HAE under treatment at the Dutch national center of reference completed a cross-sectional survey in 2021. The survey consisted of different questionnaires: angioedema-specific questionnaires (4-week Angioedema Activity Score and Angioedema Control Test), quality of life questionnaires (Angioedema Quality of Life [AE-QoL] questionnaire and EQ-5D-5L), the Treatment Satisfaction Questionnaire for Medication (TSQM), and societal costs questionnaires (iMTA Medical Consumption Questionnaire and iMTA Productivity Cost Questionnaire).

Results: The response rate was 78% (69 of 88). The entire sample had a mean Angioedema Activity Score of 16.61, and 36% of participants had poorly controlled disease as expressed by the Angioedema Control Test. The mean quality of life in the entire sample was 30.99 as expressed by the AE-QoL and 0.873 as expressed by the EQ-5D-5L utility value. Utilities dropped by 0.320 points during an angioedema attack. TSQM scores ranged from 66.67 to 75.00 across its 4 domains. On average, total costs per year incurred €22,764, predominantly existing of HAE-medication costs. Total costs showed substantial variation between patients.

Conclusions: This study describes the entire burden of HAE among Dutch patients comprising disease control, quality of life, treatment satisfaction, and societal costs. These results can inform cost-effectiveness analyses that can aid reimbursement decisions for HAE treatments.