Characteristics of individuals with alpha-1 antitrypsin deficiency from Northern and Southern European countries: EARCO international registry

Alpha-1 antitrypsin deficiency (AATD) is characterised by low serum levels of alpha-1 antitrypsin (AAT) and predisposes to the development of pulmonary emphysema and liver disease [1]. This deficiency is considered a rare condition and its prevalence ranges from one in 2400 to one in 6000 individuals in Western European countries [2]. Due to its low prevalence, large observational prospective registries are needed to collect information about the clinical characteristics and prognosis of the individuals affected.