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The European Epidemiologic Registry of Cystic Fibrosis began collecting longitudinal data on European cystic fibrosis patients in 1994. A cross-sectional analysis was performed to identify the factors associated with low values of % predicted forced expiratory volume in one second (FEV1) upon patient enrollment. Data from 7,010 patients aged &gt; or =6 yrs were included. Clinical conditions, microbiological isolates and medications reported at enrollment or within the following 180 days were analysed for age-specific associations. Factors associated with FEV1 that were lower by &gt;10% of pred values were: lower weight for age percentiles, haemoptysis, pneumothorax, pulmonary symptoms at presentation, Pseudomonas aeruginosa, Burkholderia cepacia, oral corticosteroids, nonsteroid anti-inflammatory drugs, dornase alfa, oxygen and assisted ventilation and, in patients &gt;12 yrs old only, use of airway clearance techniques, inhaled bronchodilators, oral nutritional supplements, pancreatic enzymes and insulin or oral hypoglycaemics. Slightly impaired lung function (5-10%) was associated with: diabetes (&gt; or = 18-yrs-old), gastro-oesophageal reflux, allergic bronchopulmonary aspergillosis, asthma-like symptoms, portal hypertension, Aspergillus spp. and Candida spp. Sex, Haemophilus influenzae and Staphylococcus aureus were not associated with impaired pulmonary status. Regular exercise (especially in older patients) and nasal polyposis were associated with slightly better FEV1. The results confirm those of previous studies and suggest selective prescribing in sicker patients.

Factors associated with poor pulmonary function: cross-sectional analysis of data from the ERCF