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Meta-Analysis
. 2015 Sep 26;2015(9):CD011530.
doi: 10.1002/14651858.CD011530.pub2.

Antibiotics for preventing lower respiratory tract infections in high-risk children aged 12 years and under

Igho J Onakpoya  1 , Gail Hayward, Carl J Heneghan
Affiliations
Meta-Analysis

Antibiotics for preventing lower respiratory tract infections in high-risk children aged 12 years and under

Igho J Onakpoya et al. Cochrane Database Syst Rev. .

Abstract

Background: Lower respiratory tract infections (LRTIs) in young children account for 1.4 million deaths annually worldwide. Antibiotics could be beneficial in preventing LRTIs in high-risk children, and may also help prevent school absenteeism and work days missed by children and/or carers. While it is well documented that the efficacy of antibiotic prophylaxis for RTIs decreases over time, there are no reviews that describe the use of antibiotic prophylaxis to prevent LRTIs in high-risk children aged 12 years and under.

Objectives: To assess the effectiveness and safety of antibiotic prophylaxis in the prevention of bacterial LRTIs in high-risk children aged 12 years and under.

Search methods: We searched the Cochrane Central Register of Controlled Trials (CENTRAL 2015, Issue 1) and the Database of Abstracts of Reviews of Effects (DARE), MEDLINE and MEDLINE In-Process (OvidSP) (1946 to 13 February 2015), EMBASE (OvidSP) (1974 to 12 February 2015), Science Citation Index Expanded (1945 to 13 February 2015) and Conference Proceedings Citation Index-Science (Web of Science Core Collection) (1990 to 13 February 2015). We searched for ongoing studies on ClinicalTrials.gov and the World Health Organization ICTRP. We handsearched the bibliographies of retrieved full texts of relevant studies.

Selection criteria: We included randomised controlled trials (RCTs) comparing oral or intravenous antibiotics versus placebo or no treatment to prevent infections in high-risk children aged 12 years and under. We used a combination of the Centers for Disease Control and Prevention (CDC), National Health Service (NHS), American Academy of Paediatrics (AAP) and National Institute for Health and Care Excellence (NICE) guidelines to define conditions at higher risk of complications. Our primary outcome was the incidence of bacterial lower respiratory infections. Secondary outcomes included clinical function, hospital admission, mortality, growth, use of secondary antibiotics, time off school or parental work, quality of life and adverse events.

Data collection and analysis: We extracted data using a customised data extraction sheet, assessed the risk of bias of included studies using the Cochrane 'Risk of bias' criteria, and used the GRADE criteria to rate the quality of the evidence. We used a random-effects model for meta-analysis. We presented the results narratively where we could not statistically combine data.

Main results: We included 10 RCTs of high-risk children using antibiotics (azithromycin, ciprofloxacin, co-trimoxazole, isoniazid, oral penicillin V or vancomycin) to prevent LRTIs. Three studies included HIV-infected children (n = 1345), four cystic fibrosis (n = 429) and one each sickle cell disease (n = 219), cancer (n = 160) and low birth weight neonates with underlying respiratory disorders (n = 40). The study duration ranged from seven days to three years. The quality of the evidence from studies including children with HIV infection, cystic fibrosis or cancer was moderate. Due to inadequate data, we were unable to rate the quality of the evidence for two studies: one in children with sickle cell disease (low risk of bias), and another in low birth weight neonates with underlying respiratory disorders (high risk of bias).In HIV-infected children receiving continuous isoniazid prophylaxis, there was no significant difference in the incidence of pulmonary tuberculosis (risk ratio (RR) 0.64, 95% confidence interval (CI) 0.32 to 1.29, I(2) statistic = 47%, P value = 0.21). There was no significant effect on mortality with co-trimoxazole or isoniazid prophylaxis (RR 0.82, 0.46 to 1.46, I(2) statistic = 76%, P value = 0.58); however, analysis of one study that used co-trimoxazole showed a significant reduction in mortality (RR 0.67, 95% CI 0.53 to 0.85, P value = 0.001). There was a significant decrease in the rates of hospital admission per child-year of follow-up with co-trimoxazole prophylaxis in one study (P value = 0.01). There was no evidence of increased adverse events due to antibiotic prophylaxis (RR 1.10, 95% CI 0.75 to 1.64, I(2) statistic = 22%, P value = 0.28); however, there was scant reporting of antibiotic resistance - the one study that did assess this found no increase.In two studies of children with cystic fibrosis receiving ciprofloxacin prophylaxis, there was no significant difference in Pseudomonas infections (RR 0.76, 0.44 to 1.31, I(2) statistic = 0%, P value = 0.33). In two studies assessing the benefit of azithromycin prophylaxis, there was a significant reduction in the frequency of pulmonary exacerbations (RR 0.60, 95% CI 0.48 to 0.76, I(2) statistic = 0%, P value < 0.0001). The effect of antibiotic prophylaxis on growth in children with cystic fibrosis was inconsistent across the studies. There was an increased risk of emergence of pathogenic strains with either azithromycin or ciprofloxacin prophylaxis in two studies reporting this outcome. There was no significant difference in the quality of life (one study). In three studies, there was no significant increase in the frequency of adverse events with prophylaxis with azithromycin (two studies) or ciprofloxacin (one study). There was no evidence of increased antibiotic resistance in two studies.In the one study of children with sickle cell disease, a significantly lesser proportion of children with pneumococcal septicaemia was reported with penicillin V prophylaxis (P value = 0.0025).In the one study of children with cancer there was a significant decrease in Pneumocystis carinii pneumonia with trimethoprim-sulfamethoxazole prophylaxis (RR 0.03, 95% CI 0.00 to 0.47, P value < 0.01). There was no significant increase in the frequency of adverse events with antibiotic prophylaxis.In low birth weight children with underlying respiratory disorders, there was no significant difference in the proportion of children with pulmonary infection with vancomycin prophylaxis (P value = 0.18).No included studies reported time off school or carer time off work.

Authors' conclusions: There is inconclusive evidence that antibiotic prophylaxis in certain groups of high-risk children can reduce pneumonia, exacerbations, hospital admission and mortality in certain conditions. However, limitations in the evidence base mean more clinical trials assessing the effectiveness of antibiotics for preventing LRTIs in children at high risk should be conducted. Specifically, clinical trials assessing the effectiveness of antibiotics for preventing LRTIs in congenital heart disease, metabolic disease, endocrine and renal disorders, neurological disease or prematurity should be a priority.

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Conflict of interest statement

Igho J Onakpoya has no interest to disclose. Gail Hayward has no interest to disclose. Carl J Heneghan receives payment for running educational courses at the University of Oxford and University of Oxford ISIS consulting services for external teaching and training. He also receives royalties for books (Evidence Based Toolkit series by Blackwell BMJ Books).

Figures

1
1
Study flow diagram.
2
2
'Risk of bias' summary: review authors' judgements about each risk of bias item for each included study.
1.1
1.1. Analysis
Comparison 1 Incidence of bacterial lower respiratory infection, Outcome 1 HIV‐infected children.
1.2
1.2. Analysis
Comparison 1 Incidence of bacterial lower respiratory infection, Outcome 2 Pseudomonas infection in cystic fibrosis.
1.3
1.3. Analysis
Comparison 1 Incidence of bacterial lower respiratory infection, Outcome 3 Pneumocystis carinii pneumonia.
2.1
2.1. Analysis
Comparison 2 Clinical function, Outcome 1 FEV1.
2.2
2.2. Analysis
Comparison 2 Clinical function, Outcome 2 Episodes of pulmonary exacerbation.
3.1
3.1. Analysis
Comparison 3 Effect of antibiotic prophylaxis on survival, Outcome 1 Mortality in HIV‐infected children.
4.1
4.1. Analysis
Comparison 4 Antibiotic prophylaxis and adverse events, Outcome 1 Incidence of adverse events.
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