Effects of inhaled hypertonic (7%) saline on lung function test in preschool children with cystic fibrosis: Results of a crossover, randomized clinical trial

Background:This crossover, randomized, double-blind study (conducted over a 32-week period) was performed todetermine, in clinically stable Cystic fibrosis (CF) preschool children: the effects of 7% inhaled hypertonic saline onspirometry and interrupter resistance technique (Rint), and the possible side effects.Methods:Twelve CF children (6M, mean age ± SD: 5.7 ± 0.8 yrs) were enrolled and randomly assigned to receivehypertonic saline (HS-4 ml 7% sodium chloride), or normal saline (NS-0.9% sodium chloride) twice a day. After a16 weeks period, therapy was exchanged to allow all the patients enrolled in the study to carry out both treatments.Monitoring visits, spirometry (COSMED Quark PFT4 ergo) and Rint were scheduled at 0,4,16,20,32 weeks. At T0, spirometricmeasurements and Rint were performed immediately before and 30 min after the inhalation therapy. Salbutamol(400 mcg) was administered before the drug at each visit.Results:After a 16-weeks treatment with HS an improvement of FVC (p= 0.02) and a favorable trend of FEV1 wereregistered. A worsening of FEV1(p< 0.0001) and of FEF25-75 (p= 0.019) were found in NS group. No differences werefound in expiratory and inspiratory Rint in both groups. No serious adverse events occurred.Conclusions:Seven percent hypertonic saline therapy proved to be a useful and safe treatment in young CF childrenwith clinically stable conditions