Comparison of two treatment regimens for eradication of Pseudomonas aeruginosa infection in children with cystic fibrosis

In patients with cystic fibrosis (CF), treatment of new Pseudomonas aeruginosa (Pa) infection postpones the occurrence of chronic infection, but the best eradication regimen is unknown .Aim of the studyCompare 2 Pa eradication regimens in children with new Pa infection.MethodsChildren with CF (0–18 years) and a new isolation of Pa from sputum, cough swab or BAL were randomized to treatment with tobramycin inhalation solution for 28 days (TIS) or inhaled sodiumcolistimethate (2 × 2 mill U/day) plus oral ciprofloxacin (30 mg/kg/day) for 3 months (CC). Airway cultures were taken for 6 consecutive months, then every 3 months. The primary outcome was Pa eradication at the end of treatment. Secondary outcome parameters were: time to Pa relapse from end of treatment, total and Pa specific IgG, FEV1, BMI and Pa status at 2 year follow-up.Results58 patients with new Pa isolation were randomized. Their median age was 9 years (IQR 4.7–13.1) and their median FEV1 98% predicted (IQR 87–107). Eighteen treatments concerned the first Pa isolation ‘ever’ (TIS: 8; CC: 10). For the remaining, median time since previous Pa was 19 months (IQR 9–41). Eradication at end of treatment was similar for both treatments: 26/29 CC and 23/29 in TOBI treated patients (p = 0.47). Median time to recurrence of Pa was 9 months (95% CI 0.0–19.0) for CC and 5 months (95% CI 1.7–8.3) for TIS (p = 0.608). After 1 year, the 2 groups did not differ in change in total and Pa specific IgG, FEV1 and BMI. After 2 years, 10% of patients had chronic Pa infection.ConclusionIn children with CF and new Pa infection, inhalation of TIS (28 days) or CC (3 months) resulted in similar eradication success at the end of treatment (80 and 90% respectively) and similar clinical evolution during the first 2 years of follow-up.