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Review
. 2018 Sep 17;9(9):CD009530.
doi: 10.1002/14651858.CD009530.pub4.

Bronchoscopy-guided antimicrobial therapy for cystic fibrosis

Affiliations
Review

Bronchoscopy-guided antimicrobial therapy for cystic fibrosis

Kamini Jain et al. Cochrane Database Syst Rev. .

Update in

Abstract

Background: Early diagnosis and treatment of lower respiratory tract infections are the mainstay of management of lung disease in cystic fibrosis. When sputum samples are unavailable, treatment relies mainly on cultures from oropharyngeal specimens; however, there are concerns regarding the sensitivity of these to identify lower respiratory organisms.Bronchoscopy and related procedures (including bronchoalveolar lavage) though invasive, allow the collection of lower respiratory specimens from non-sputum producers. Cultures of bronchoscopic specimens provide a higher yield of organisms compared to those from oropharyngeal specimens. Regular use of bronchoscopy and related procedures may help in a more accurate diagnosis of lower respiratory tract infections and guide the selection of antimicrobials, which may lead to clinical benefits.This is an update of a previous review.

Objectives: To evaluate the use of bronchoscopy-guided antimicrobial therapy in the management of lung infection in adults and children with cystic fibrosis.

Search methods: We searched the Cochrane Cystic Fibrosis Trials Register, compiled from electronic database searches and handsearching of journals and conference abstract books. Date of latest search: 30 August 2018.We also searched three registries of ongoing studies and the reference lists of relevant articles and reviews. Date of latest search: 10 April 2018.

Selection criteria: We included randomized controlled studies including people of any age with cystic fibrosis, comparing outcomes following therapies guided by the results of bronchoscopy (and related procedures) with outcomes following therapies guided by the results of any other type of sampling (including cultures from sputum, throat swab and cough swab).

Data collection and analysis: Two review authors independently selected studies, assessed their risk of bias and extracted data. We contacted study investigators for further information. The quality of the evidence was assessed using the GRADE criteria.

Main results: The search identified 11 studies, but we only included one study enrolling infants with cystic fibrosis under six months of age and diagnosed through newborn screening (170 enrolled); participants were followed until they were five years old (data from 157 children). The study compared outcomes following therapy directed by bronchoalveolar lavage for pulmonary exacerbations with standard treatment based on clinical features and oropharyngeal cultures.We considered this study to have a low risk of bias; however, the statistical power to detect a significant difference in the prevalence of Pseudomonas aeruginosa was limited due to the prevalence (of Pseudomonas aeruginosa isolation in bronchoalveolar lavage samples at five years age) being much lower in both the groups compared to that which was expected and which was used for the power calculation. The sample size was adequate to detect a difference in high-resolution computed tomography scoring. The quality of evidence for the key parameters was graded as low except high-resolution computed tomography scoring and cost of care analysis, which were graded as moderate quality.At five years of age, there was no clear benefit of bronchoalveolar lavage-directed therapy on lung function z scores or nutritional parameters. Evaluation of total and component high-resolution computed tomography scores showed no significant difference in evidence of structural lung disease in the two groups.In addition, this study did not show any difference between the number of isolates of Pseudomonas aeruginosa per child per year diagnosed in the bronchoalveolar lavage-directed therapy group compared to the standard therapy group. The eradication rate following one or two courses of eradication treatment was comparable in the two groups, as were the number of pulmonary exacerbations. However, the number of hospitalizations was significantly higher in the bronchoalveolar lavage-directed therapy group, but the mean duration of hospitalizations was significantly less compared to the standard therapy group.Mild adverse events were reported in a proportion of participants, but these were generally well-tolerated. The most common adverse event reported was transient worsening of cough after 29% of procedures. Significant clinical deterioration was documented during or within 24 hours of bronchoalveolar lavage in 4.8% of procedures.

Authors' conclusions: This review, limited to a single, well-designed randomized controlled study, shows no clear evidence to support the routine use of bronchoalveolar lavage for the diagnosis and management of pulmonary infection in pre-school children with cystic fibrosis compared to the standard practice of providing treatment based on results of oropharyngeal culture and clinical symptoms. No evidence was available for adult and adolescent populations.

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Conflict of interest statement

Kamini Jain declares no known potential conflict of interest.

Claire Wainwright has received research grants from the NHMRC, GlaxoSmithKline and Novo Nordisk Pharmaceuticals P/L. Her institution has received income on a per patient basis from pharmaceutical studies (Vertex Pharmaceuticals Inc., Boehringer‐Ingelheim & Ablynx NV). Dr Wainwright has been a consultant on the Vertex Physician Pediatric CF Advisory Board and the Vertex Innovation Awards (VIA) Grants Committee and is currently on the board of the International Advisory Board Vertex Pharmaceuticals P/L. She has received travel and accommodation expenses from Vertex Pharmaceuticals Inc and Novartis Pharmaceuticals. Payments for all items listed above have been made into an institutional consultancy fund account.

Alan R Smyth declares relevant activities of membership of consultancies for Vertex and PTC, and lectures paid for by PTC, Vertex, Teva, Novartis.

Figures

1
1
Study flow diagram.
2
2
Risk of bias graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
1.1
1.1. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 1 Z score FEV1.
1.2
1.2. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 2 Z score FVC.
1.3
1.3. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 3 Total CF‐CT score (Brody‐II).
1.4
1.4. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 4 Individual CF‐CT scores (at 5 years).
1.5
1.5. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 5 Z score for weight.
1.6
1.6. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 6 Z score BMI.
1.7
1.7. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 7 Positive P aeruginosa isolates per patient per year.
1.8
1.8. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 8 Prevalence of P aeruginosa in BAL at 5 years age.
1.9
1.9. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 9 Sensitivity analysis ‐ Prevalence of P aeruginosa in BAL at 5 years age (40% vs 5%).
1.10
1.10. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 10 Sensitivity analysis ‐ Prevalence of P aeruginosa in BAL at 5 years age (5% vs 40%).
1.11
1.11. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 11 Clearance of P aeruginosa after 1 or 2 eradication treatments.
1.12
1.12. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 12 Age at first acquisition of P aeruginosa infection.
1.13
1.13. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 13 Number of hospital admissions per patient per year.
1.14
1.14. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 14 Number of hospitalizations per person per year due to non‐P aeruginosa exacerbations.
1.15
1.15. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 15 Duration of hospital admissions due to non‐P aeruginosa exacerbations.
1.16
1.16. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 16 Days as hospital inpatient per patient per year.
1.17
1.17. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 17 Total cost of care per participant (Australian Dollars).
1.18
1.18. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 18 Mean hospital admissions cost per patient.
1.19
1.19. Analysis
Comparison 1 BAL‐directed therapy versus standard therapy, Outcome 19 Number of pulmonary exacerbations (requiring oral or intravenous antibiotics) per patient per year.

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References

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References to other published versions of this review

Jain 2013
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