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Unlabelled: Acquisition of Pseudomonas aeruginosa is known as a negative prognostic factor in patients with cystic fibrosis. We started a pilot study to evaluate Ps. aeruginosa gene expression directly from the sputum of infected patients. Total RNA was purified from 15 sputum samples collected from 10 patients, and the expression levels of five genes from Ps. aeruginosa were measured by RT-qPCR. Expression of algD, algR, antB, lasB and pqsA genes was determined in sputa that contained Ps. aeruginosa cells. The resultant data provided an overview of the expression of these genes in CF patients. Except for the correlation between algD expression and the mucoid phenotype, the gene expression profile could not be associated with the clinical status of patients. However, beyond the heterogeneity of the Ps. aeruginosa phenotype in sputum, we observed a correlation between the expression of antB and pqsA and a low level of lasB transcripts., Significance and Impact of the Study: Pseudomonas aeruginosa infection leads to high morbidity and mortality in cystic fibrosis patients. The identification of Ps. aeruginosa-assigned factors is important to eradicate the colonization. We started a pilot study to evaluate the gene expression of Ps. aeruginosa directly from the sputum of infected patients. Preliminary results suggest that beyond the heterogeneity of the Ps. aeruginosa phenotype in sputum, we observe a correlation between the expression of antB and pqsA and a low level of lasB transcripts. This approach could shed some light on the behaviour of Ps. aeruginosa during pulmonary infection and may reveal some important elements for optimizing therapy., (© 2015 The Society for Applied Microbiology.)

Background: Consensus guidelines recommend early treatment to eradicate newly acquired Pseudomonas aeruginosa (Pa) infection in cystic fibrosis (CF) patients although there is no single preferred regimen. Aztreonam for inhalation solution (AZLI) significantly reduces sputum Pa density in CF patients with chronic Pa infection and has been well tolerated in the pediatric population. This single-arm, open-label Aztreonam Lysine for Pseudomonas Infection Eradication (ALPINE) study was conducted to evaluate the safety and efficacy of a 28-day treatment course of AZLI to eradicate newly acquired Pa infection in pediatric CF patients., Methods: CF patients (3 months to <18 years) with new onset Pa infection were treated with AZLI 75 mg 3 times daily for 28 days. New onset Pa infection was defined as first lifetime Pa-positive respiratory tract culture (throat swab, sputum) or Pa-positive culture after a ≥2-year history of Pa-negative cultures (≥ 2 cultures/year). Sputum or throat swab cultures were collected at study entry (baseline) and at weeks 4 (end of treatment), 8, 16, and 28. Primary endpoint was the percentage of patients with cultures negative for Pa at all post-treatment time points., Results: A total of 105 pediatric CF patients enrolled (3 months to <2 years, n=24; 2 to <6 years, n=25; 6 to <18 years, n=56). Of the 101 patients who completed treatment, 89.1% (n=90) were free of Pa at the end of treatment and 75.2% (n=76) were free of Pa 4 weeks after the end of treatment. Of the 79 patients evaluable for the primary endpoint, 58.2% were free of Pa at all post-treatment time points., Conclusions: AZLI was effective and well tolerated in eradicating Pa from newly infected pediatric patients with CF. These eradication rates are consistent with success rates reported in the literature for various antibiotic regimens, including other inhaled antibiotics studied for eradication. ClinicalTrials.gov: NCT01375049., (Copyright © 2014. Published by Elsevier B.V.)

The prerequisite to monitor gene expression is the selection of reference genes for normalization of RT-qPCR results. Using 13 sputum samples collected from 9 CF patients, we demonstrated that PA2875 and PA3340 are better reference genes than the previously used clpX and oprL genes., (Copyright © 2013 Elsevier Ltd. All rights reserved.)

Background: We aimed to evaluate the use of central catheters introduced by a peripheral vein (PICC) in children with CF., Methods: A descriptive study in patients in whom a PICC (Beckton Dickinson) was inserted., Results: 24 children aged (median (range) 10.2 years (0.3-17.3) undergoing 44 procedures were included. PICC was successfully inserted in 93.2% (41/44) of cases. Total procedure duration was (median (range)) 32.5 (10-105) minutes. The operators encountered few difficulties, median (range) 2 (1-10) (1 (absence) to 10 (maximal)); median (range) 1 (1 to 5) attempt per child). No major side effects or infections were observed. PICC obstruction in 5 (12%) cases was successfully unblocked in 4 cases (urokinase). The catheter was functional throughout the antibiotic course in 40/41 cases. A final Doppler scan (30 cases) showed total permeability of the central veins in all cases. Satisfaction index of the operators and the patients were high: median (range) 9.5 (1-10) and 8.0 (6-10) (scale: 1 (worse) to 10 (best)), respectively., Conclusion: PICCs are simple to use, and may be safely inserted in the ward. Such catheters are well tolerated, may increase the well-being of children with CF and prove an effective means by which to deliver IV therapy in this population.