Clinical communication preferences in cystic fibrosis and strategies to optimize care.

BACKGROUND: The importance of optimizing communication between clinicians and individuals and families living with cystic fibrosis (CF) about daily care, adherence, and related psychosocial concerns is well documented. The purpose of this study was to gain an understanding of interpersonal communication experiences and preferences among individuals and families living with CF as they engage with the clinical team. The study also aimed to reveal opportunities for enhancing future interpersonal communication practices. METHODS: Five U.S. CF care centers participated in the following activities: (a) On-site observation of clinic interactions during outpatient visits; (b) On-site 1:1 interviews with individuals living with CF, their family members, and CF clinicians; (d) Focus groups conducted in person with CF care team members; (d) Focus groups conducted virtually with adults and family members with CF. Content analysis of transcripts and constant comparative methods were used to identify emergent themes. RESULTS: Four themes related to participants' needs and preferences for clinic interactions emerged during analysis: (a) eliciting psychosocial concerns, (b) addressing childhood development and transitions, (c) negotiating agendas and sharing decisions, and (d) educating to enhance CF conversations. CONCLUSION: CF clinicians and individuals and families living with CF expressed the need for resources and training to engage in better conversations with each other. Participants identified areas of high priority, including working together around social, psychological, and economic challenges, preparation for transition to adulthood, and sustaining daily care. Findings point to the value of developing advanced communication skills that foster trust-building, negotiating agendas, active listening, and collaborative goal-setting.

Aminoglycoside resistance of Pseudomonas aeruginosa in cystic fibrosis results from convergent evolution in the mexZ gene.

RATIONALE: Aminoglycoside (AG) resistance of Pseudomonas aeruginosa in cystic fibrosis (CF) is associated with poorer clinical outcomes and is usually due to overexpression of the efflux pump MexXY. MexXY is regulated by mexZ, one of the most commonly mutated genes in CF P. aeruginosa isolates. Little is known about the evolutionary relationship between AG resistance, MexXY expression and mexZ mutations. OBJECTIVES: To test the hypothesis that AG resistance in P. aeruginosa develops in parallel with higher MexXY expression and mexZ mutations. METHODS: CF P. aeruginosa isolates were compared for chronically infected (CI) adults, CI children and children with new infection. MEASUREMENTS: One P. aeruginosa isolate from each patient was analysed for mexZ mutations, mexY mRNA expression and amikacin resistance. MAIN RESULTS: 56 patients with CF were enrolled: 21 children with new P. aeruginosa infection, 18 CI children and 17 CI adults. Amikacin resistance and mexY mRNA expression were higher in cohorts with longer P. aeruginosa infection. The prevalence of non-conservative mexZ mutations was 0%, 33% and 65% in children with new infection, CI children and CI adults, respectively. The same trend was seen in the ratio of non-conservative to non-synonymous mexZ mutations. Of isolates with non-conservative mexZ mutations, 59% were amikacin-resistant compared with 18% of isolates with non-synonymous mutations. The doubling rate of amikacin resistance and non-conservative mexZ mutations was approximately 5 years. CONCLUSIONS: P. aeruginosa mexZ mutations undergo positive selection resulting in increased mexY mRNA expression and amikacin resistance and likely play a role in bacterial adaption in the CF lung.

Evolution of Pseudomonas aeruginosa type III secretion in cystic fibrosis: a paradigm of chronic infection.

Pseudomonas aeruginosa (PA) from acute and chronic (eg, cystic fibrosis (CF)) infections differ in several respects, but they can worsen prognosis in each context. Factors that facilitate conversion from an acute to chronic phenotype are poorly understood. T3 secretion proteins are virulence factors associated with poorer outcomes in acute infections, but little is known about their role in CF. We wished to characterize T3 secretion in CF PA isolates and to examine its role in clinical outcomes. A total of 114 CF subjects were divided into 3 cohorts: 1st infected individuals, CI children, and adults. Serial respiratory cultures were analyzed for T3 secretion. Serial spirometry and exacerbation data were collected prospectively. In 1st infection, 45.2% +/- 9.1% of PA isolates secreted T3 proteins compared with 29.1% +/- 4.2% and 11.5% +/- 3.0% in CI children and CI adults, respectively (P < 0.001). An inverse correlation was observed between duration of PA infection and percent T3 positive isolates (r = -0.32, P < 0.001). Overall, no association was observed between T3 secretion and pulmonary outcomes, but in the subgroup of subjects who had at least 1 T3 positive organism, T3 secretion was inversely correlated with the forced expiratory volume in 1 s (FEV(1)) decline (r = -0.35, P = 0.02). In 1st infection, 82% of cultures grew either all or no T3-positive organisms. In these patients, T3 secretion was associated with a greater risk of subsequent PA isolation (P < 0.001). In CF, PA T3 secretion decreases with residence time in lung, may predict FEV(1) decline in patients who have detectable T3 organisms, and may facilitate persistence after 1st infection.