Nebulized hypertonic saline (HS) has gathered increasing attention in bronchiolitis. This study aims to evaluate the relationship between the dose of nebulized HS and the effects on bronchiolitis. Five electronic databases—PubMed, EMBASE, Cochrane Central Register of Controlled Trials, ClinicalTrials.gov, and ISRCTN—were searched until May 2021. Randomized controlled trials (RCTs) that investigated the effect of HS on bronchiolitis were included. A total of 35 RCTs met the eligibility criteria. HS nebulization may shorten the length of stay (LOS) in hospital (mean difference −0.47, 95% CI −0.71 to –0.23) and improve the 24-hour, 48-hour, and 72-hour Clinical Severe Score (CSS) in children with bronchiolitis. The results showed that there was no significant difference between 3% HS and the higher doses (>3%) of HS in LOS and 24-hour CSS. Although the dose–response meta-analysis found that there may be a linear relationship between different doses and effects, the slope of the linear model changed with different included studies. Besides, HS nebulization could reduce the rate of hospitalization of children with bronchiolitis (risk ratio 0.88, 95% CI 0.78 to 0.98), while the trial sequential analysis indicated the evidence may be insufficient and potentially false positive. This study showed that nebulized HS is an effective and safe therapy for bronchiolitis. More studies are necessary to be conducted to evaluate the effects of different doses of HS on bronchiolitis.
- respiration disorders
- respiratory tract diseases
- lung diseases
- pulmonary disease
- chronic obstructive
Data availability statement
All data relevant to the study are included in the article or uploaded as supplementary information.
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Contributors JL is responsible for concept and design, data searching, inclusion and exclusion of studies, data analysis, and draft of the manuscript. YZ and AS are responsible for data extraction, assessment of methodological quality, and data analysis. LY is responsible for data searching and assessment of methodological quality. JD is responsible for the assessment of methodological quality and revision of articles. All authors read and approved the final manuscript.
Funding The authors thank the Youth Program of the National Natural Science Foundation of China (No. 81700017).
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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