This study aimed to investigate the nature and effect of exacerbations in patients with a 1 -antitrypsin deficiency and to assess the impact of exacerbations on health status. Furthermore, the relationship of exacerbations to changes in lung function and health status was investigated.In total, 265 patients with severe deficiency (PiZ phenotype) were assessed over 12 months and a subgroup of 87 patients was studied for 3 yrs. Exacerbations were recorded and patients underwent full lung function testing and health status measurement.Exacerbations occurred in 142 patients (54%) over 12 months, with a median duration of 14 days (interquartile range 7-21). Health status was significantly worse in patients with exacerbations, especially those with frequent exacerbations. Neither the presence nor the frequency of exacerbations showed a relationship to decline in forced expiratory volume in one second, but the number of exacerbations was weakly associated with decline in gas transfer of the lung for carbon monoxide. Despite lung function decline, health status did not change significantly over 3 yrs.In conclusion, exacerbations occur commonly in patients with a 1 -antitrypsin deficiency and are associated with worse health status. Exacerbations were associated with a decline in the gas transfer of the lung for carbon monoxide over time, but show no relationship to changes in forced expiratory volume in one second. Despite lung function decline, patients do not show a progressive loss in health status.
Alpha-1-antitrypsin deficiency is associated with variable development of airflow obstruction and emphysema. Index patients have greater airflow obstruction than subjects detected by screening, but it is unclear if this reflects smoking differences and/or ascertainment bias, or is due to additional genetic factors. In this study 72 sibling pairs with alpha-1-antitrypsin deficiency were compared using lung function measurements and HRCT chest. Tag single nucleotide polymorphisms to cover all common variation in four genes involved in relevant inflammatory pathways (Tumour necrosis factor alpha, Transforming growth Factor beta, Surfactant protein B and Vitamin D binding protein) were genotyped using TaqMan technology and compared between pairs for their frequency and relationship to lung function. 63.5% of non-index siblings had airflow obstruction and 59.5% an FEV(1) < 80% predicted. Index siblings had lower FEV(1) and FEV(1)/FVC ratio, a higher incidence of emphysema (all P
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