A treatment evaluator tool to monitor the real-world effectiveness of inhaled aztreonam lysine in cystic fibrosis

Abstract Background Studies are required that evaluate real-world outcomes of inhaled aztreonam lysine in patients with cystic fibrosis (CF). Methods Our treatment-evaluator tool assessed the effectiveness of inhaled aztreonam in routine practice in 117 CF patients across four time periods (6–12 (P2) and 0–6months (P1) pre-initiation, and 0–6 (T1) and 6–12months (T2) post-initiation). Outcomes were: changes in %-predicted forced expiratory volume in 1s (FEV 1 ), body-mass index (BMI), hospitalisation days and intravenous antibiotic usage. Results Median FEV 1 % predicted for each 6-month period was 38.9%, 34.6%, 37.1% and 36.5%; median change was −2.0% between P2 and P1, increasing to +0.6% (p Conclusions In patients with CF in routine practice, inhaled aztreonam lysine is associated with improved lung function and weight, and reduced hospitalisation and intravenous antibiotic use.