Nebulized hypertonic saline for bronchiolitis: a randomized clinical trial

Nebulised hypertonic saline solution for acute bronchiolitis in infants

BACKGROUND

Airway oedema (swelling) and mucus plugging are the principal pathological features in infants with acute viral bronchiolitis. Nebulised hypertonic saline solution (≥ 3%) may reduce these pathological changes and decrease airway obstruction. This is an update of a review first published in 2008, and updated in 2010, 2013, and 2017.

OBJECTIVES

To assess the effects of nebulised hypertonic (≥ 3%) saline solution in infants with acute bronchiolitis.

SEARCH METHODS

We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, MEDLINE Epub Ahead of Print, In-Process & Other Non-Indexed Citations, Ovid MEDLINE Daily, Embase, CINAHL, LILACS, and Web of Science on 13 January 2022. We also searched the World Health Organization International Clinical Trials Registry Platform (WHO ICTRP) and ClinicalTrials.gov on 13 January 2022.

SELECTION CRITERIA

We included randomised controlled trials (RCTs) and quasi-RCTs using nebulised hypertonic saline alone or in conjunction with bronchodilators as an active intervention and nebulised 0.9% saline or standard treatment as a comparator in children under 24 months with acute bronchiolitis. The primary outcome for inpatient trials was length of hospital stay, and the primary outcome for outpatients or emergency department (ED) trials was rate of hospitalisation.

DATA COLLECTION AND ANALYSIS

Two review authors independently performed study selection, data extraction, and assessment of risk of bias in included studies. We conducted random-effects model meta-analyses using Review Manager 5. We used mean difference (MD), risk ratio (RR), and their 95% confidence intervals (CI) as effect size metrics.

MAIN RESULTS

We included six new trials (N = 1010) in this update, bringing the total number of included trials to 34, involving 5205 infants with acute bronchiolitis, of whom 2727 infants received hypertonic saline. Eleven trials await classification due to insufficient data for eligibility assessment. All included trials were randomised, parallel-group, controlled trials, of which 30 were double-blinded. Twelve trials were conducted in Asia, five in North America, one in South America, seven in Europe, and nine in Mediterranean and Middle East regions. The concentration of hypertonic saline was defined as 3% in all but six trials, in which 5% to 7% saline was used. Nine trials had no funding, and five trials were funded by sources from government or academic agencies. The remaining 20 trials did not provide funding sources. Hospitalised infants treated with nebulised hypertonic saline may have a shorter mean length of hospital stay compared to those treated with nebulised normal (0.9%) saline or standard care (mean difference (MD) -0.40 days, 95% confidence interval (CI) -0.69 to -0.11; 21 trials, 2479 infants; low-certainty evidence). Infants who received hypertonic saline may also have lower postinhalation clinical scores than infants who received normal saline in the first three days of treatment (day 1: MD -0.64, 95% CI -1.08 to -0.21; 10 trials (1 outpatient, 1 ED, 8 inpatient trials), 893 infants; day 2: MD -1.07, 95% CI -1.60 to -0.53; 10 trials (1 outpatient, 1 ED, 8 inpatient trials), 907 infants; day 3: MD -0.89, 95% CI -1.44 to -0.34; 10 trials (1 outpatient, 9 inpatient trials), 785 infants; low-certainty evidence). Nebulised hypertonic saline may reduce the risk of hospitalisation by 13% compared with nebulised normal saline amongst infants who were outpatients and those treated in the ED (risk ratio (RR) 0.87, 95% CI 0.78 to 0.97; 8 trials, 1760 infants; low-certainty evidence). However, hypertonic saline may not reduce the risk of readmission to hospital up to 28 days after discharge (RR 0.83, 95% CI 0.55 to 1.25; 6 trials, 1084 infants; low-certainty evidence). We are uncertain whether infants who received hypertonic saline have a lower number of days to resolution of wheezing compared to those who received normal saline (MD -1.16 days, 95% CI -1.43 to -0.89; 2 trials, 205 infants; very low-certainty evidence), cough (MD -0.87 days, 95% CI -1.31 to -0.44; 3 trials, 363 infants; very low-certainty evidence), and pulmonary moist crackles (MD -1.30 days, 95% CI -2.28 to -0.32; 2 trials, 205 infants; very low-certainty evidence). Twenty-seven trials presented safety data: 14 trials (1624 infants; 767 treated with hypertonic saline, of which 735 (96%) co-administered with bronchodilators) did not report any adverse events, and 13 trials (2792 infants; 1479 treated with hypertonic saline, of which 416 (28%) co-administered with bronchodilators and 1063 (72%) hypertonic saline alone) reported at least one adverse event such as worsening cough, agitation, bronchospasm, bradycardia, desaturation, vomiting and diarrhoea, most of which were mild and resolved spontaneously (low-certainty evidence).

AUTHORS' CONCLUSIONS

Nebulised hypertonic saline may modestly reduce length of stay amongst infants hospitalised with acute bronchiolitis and may slightly improve clinical severity score. Treatment with nebulised hypertonic saline may also reduce the risk of hospitalisation amongst outpatients and ED patients. Nebulised hypertonic saline seems to be a safe treatment in infants with bronchiolitis with only minor and spontaneously resolved adverse events, especially when administered in conjunction with a bronchodilator. The certainty of the evidence was low to very low for all outcomes, mainly due to inconsistency and risk of bias.

UPDATE - 2022 Italian guidelines on the management of bronchiolitis in infants

Bronchiolitis is an acute respiratory illness that is the leading cause of hospitalization in young children. This document aims to update the consensus document published in 2014 to provide guidance on the current best practices for managing bronchiolitis in infants. The document addresses care in both hospitals and primary care. The diagnosis of bronchiolitis is based on the clinical history and physical examination. The mainstays of management are largely supportive, consisting of fluid management and respiratory support. Evidence suggests no benefit with the use of salbutamol, glucocorticosteroids and antibiotics with potential risk of harm. Because of the lack of effective treatment, the reduction of morbidity must rely on preventive measures. De-implementation of non-evidence-based interventions is a major goal, and educational interventions for clinicians should be carried out to promote high-value care of infants with bronchiolitis. Well-prepared implementation strategies to standardize care and improve the quality of care are needed to promote adherence to guidelines and discourage non-evidence-based attitudes. In parallel, parents' education will help reduce patient pressure and contribute to inappropriate prescriptions. Infants with pre-existing risk factors (i.e., prematurity, bronchopulmonary dysplasia, congenital heart diseases, immunodeficiency, neuromuscular diseases, cystic fibrosis, Down syndrome) present a significant risk of severe bronchiolitis and should be carefully assessed. This revised document, based on international and national scientific evidence, reinforces the current recommendations and integrates the recent advances for optimal care and prevention of acute bronchiolitis.

3% nebulized hypertonic saline versus normal saline for infants with acute bronchiolitis: A systematic review and meta-analysis of randomized controlled trials

BACKGROUND

This study evaluated the efficacy and safety of 3% nebulized hypertonic saline (NHS) in infants with acute bronchiolitis (AB).

METHODS

We systematically searched the PUBMED, EMBASE, Cochrane Library, China National Knowledge Infrastructure Database, WANFANG, and VIP databases from inception to June 1, 2022. We included randomized controlled trials comparing NHS with 0.9% saline. Outcomes included the length of hospital stay (LOS), rate of hospitalization (ROH), clinical severity score (CSS), rate of readmission, respiratory distress assessment instrument, and adverse events. RevMan V5.4 software was used for statistical analysis.

RESULTS

A total of 27 trials involving 3495 infants were included in this study. Compared to normal saline, infants received 3% NHS showed better outcomes in LOS reduction (MD = -0.60, 95% CI [-1.04, -0.17], I2 = 92%, P = .007), ROH decrease (OR = 0.74, 95% CI [0.59, 0.91], I2 = 0%, P = .005), CSS improvement at day 1 (MD = -0.79, 95% CI [-1.23, -0.34], I2 = 74%, P < .001), day 2 (MD = -1.26, 95% CI [-2.02, -0.49], I2 = 91%, P = .001), and day 3 and over (MD = -1.27, 95% CI [-1.92, -0.61], I2 = 79%, P < .001), and respiratory distress assessment instrument enhancement (MD = -0.60, 95% CI [-0.95, -0.26], I2 = 0%, P < .001). No significant adverse events related to 3% NHS were observed.

CONCLUSION

This study showed that 3% NHS was better than 0.9% normal saline in reducing LOS, decreasing ROH, improving CSS, and in enhancing the severity of respiratory distress. Further studies are needed to validate these findings.

Acute bronchiolitis in Switzerland - Current management and comparison over the last two decades

BACKGROUND

Although international guidelines and Cochrane reviews emphasize that therapies do not alter the natural course of acute viral bronchiolitis (AVB), they are still prescribed frequently. This survey evaluated self-reported management of AVB by Swiss pediatricians in 2019 and compared it with previous surveys.

METHODS

We performed a cross-sectional online survey of all board-certified pediatricians in Switzerland in November 2019 and compared the reported use of therapies with that reported in the 2001 and 2006 surveys. We used multivariable ordered logistic regression to assess factors associated with reported prescription of bronchodilators, corticosteroids, antibiotics, and physiotherapy.

RESULTS

Among 1618 contacted board-certified pediatricians, 884 returned the questionnaires (55% response rate). After exclusions were applied, 679 were included in the final analysis. Pediatricians working in primary care reported using therapeutics more frequently than those working in a hospital setting, either always or sometimes: bronchodilators 53% versus 38%, corticosteroids 37% versus 23%, and antibiotics 39% versus 22%. The opposite occurred with physiotherapy: 53% reported prescribing it in hospital and 44% in primary care. There was an overall decrease in the prescription of therapeutics and interventions for AVB from 2001 to 2019. The proportion who reported "always" prescribing corticosteroids decreased from 71% to 2% in primary care, and of those "always" prescribing bronchodilators from 55% to 1% in hospitals.

CONCLUSION

Although we observed a significant decrease since 2001, more effort is required to reduce the use of unnecessary therapies in children with AVB.

Clinical course and cost assessment of infants with a first episode of acute bronchiolitis presenting to the emergency department: Data from the GUERANDE clinical trial

INTRODUCTION

Bronchiolitis is the leading cause of hospitalization for infants but its economic burden is not well documented. Our objective was to describe the clinical evolution and to assess the 1-month cost of a first episode of acute bronchiolitis presenting to the emergency department (ED).

METHODS

Our study was an epidemiologic analysis and a cost study of the cohort drawn from the clinical trial GUERANDE, conducted in 24 French pediatric EDs. Infants of 6 weeks to 12 months of age presenting at pediatric EDs with a first episode of bronchiolitis were eligible. The costs considered were collected from a societal viewpoint, according to the recommendations of the French National Health Authority.

RESULTS

A total of 777 infants were included with a median age of 4 months. A total of 57% were hospitalized during the month following the first consultation in the ED, including 28 (3.6%) in an intensive care unit. The mean length of stay was 4.2 days (SD = 3.7). The average time to relief of all symptoms was 13 days (SD = 7). Average total cost per patient was €1919 (95% confidence interval: 1756-2138) from a societal perspective, mostly due to hospitalization cost. The estimated annual cost of bronchiolitis in infants was evaluated to be between €160 and €273 million in France.

DISCUSSION

Bronchiolitis represent a high cost for the health care system and broadly for society, with hospitalizations costs being the main cost driver. Thus significant investments should be made to develop innovative therapies, to reduce the number of hospitalizations and length of stay.

Exploring the appropriate dose of nebulized hypertonic saline for bronchiolitis: a dose-response meta-analysis

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.

The cost-effectiveness of hypertonic saline inhalations for infant bronchiolitis

BACKGROUND

Pharmacological treatment for bronchiolitis is primarily supportive because bronchodilators, steroids, and antibiotics, show little benefit. Clinical studies have suggested that nebulized 3% hypertonic solution is useful for infants with bronchiolitis. This study aims to evaluate the cost-effectiveness of the HS inhalations in infant bronchiolitis in a tropical country.

METHODS

Decision tree analysis was used to calculate the expected costs and QALYs. All cost and use of resources were collected directly from medical invoices of 193 patient hospitalized with diagnosis of bronchiolitis in tertiary centers, of Rionegro, Colombia. The utility values applied to QALYs calculations were collected from the literature. The economic analysis was carried out from a societal perspective.

RESULTS

The model showed that nebulized 3% hypertonic solution, was associated with lower total cost than controls (US $200vs US $240 average cost per patient), and higher QALYs (0.92 vs 0.91 average per patient); showing dominance. A position of dominance negates the need to calculate an incremental cost-effectiveness ratio.

CONCLUSION

The nebulized 3% hypertonic solution was cost-effective in the inpatient treatment of infant bronchiolitis. Our study provides evidence that should be used by decision-makers to improve clinical practice guidelines and should be replicated to validate their results in other tropical countries.

A Systematic Review of Clinical Practice Guidelines for the Diagnosis and Management of Bronchiolitis

BACKGROUND

Bronchiolitis is the leading cause of hospital admission for respiratory disease among infants aged <1 year. Clinical practice guidelines can benefit patients by reducing the performance of unnecessary tests, hospital admissions, and treatment with lack of a supportive evidence base. This review aimed to identify current clinical practice guidelines worldwide, appraise their methodological quality, and discuss variability across guidelines for the diagnosis and management of bronchiolitis.

METHODS

A systematic literature review of electronic databases EMBASE, Global Health, and Medline was performed. Manual searches of the gray literature, national pediatric society websites, and guideline-focused databases were performed, and select international experts were contacted to identify additional guidelines. The Appraisal of Guidelines for Research and Evaluation assessment tool was used by 2 independent reviewers to appraise each guideline.

RESULTS

Thirty-two clinical practice guidelines met the selection criteria. Quality assessment revealed significant shortcomings in a number of guidelines, including lack of systematic processes in formulating guidelines, failure to state conflicts of interest, and lack of consultation with families of affected children. There was widespread agreement about a number of aspects, such as avoidance of the use of unnecessary diagnostic tests, risk factors for severe disease, indicators for hospital admission, discharge criteria, and nosocomial infection control. However, there was variability, even within areas of consensus, over specific recommendations, such as variable thresholds for oxygen therapy. Guidelines showed significant variability in recommendations for the pharmacological management of bronchiolitis, with conflicting recommendations over whether use of nebulized epinephrine, hypertonic saline, or bronchodilators should be routinely trialled.

CONCLUSIONS

Future guidelines should aim to be compliant with international standards for clinical guidelines to improve their quality and clarity and to promote their adoption into practice. Variable recommendations between guidelines may reflect the evolving evidence base for bronchiolitis management, and platforms should be created to understand this variability and promote evidence-based recommendations.

Exploring the efficacy of using hypertonic saline for nebulizing treatment in children with bronchiolitis: a meta-analysis of randomized controlled trials

BACKGROUND

Inhaled hypertonic saline (HS) has shown benefit in decreasing airway edema in acute bronchiolitis which is the most common lower respiratory infection resulting in dyspnea among infants under 2 years old. The aim of this systematic review and meta-analysis was to evaluate the efficacy and safety of HS in the implementation of treatment with nebulized HS among children with bronchiolitis.

METHODS

A systematic literature search was conducted using Cochrane Library, PubMed, EMBASE and Airiti Library (Chinese Database) for randomized controlled trials from inception to July 2019. We calculated pooled risk ratios (RR), mean difference (MD) and 95% CI using RevMan 5.3 for meta-analysis.

RESULTS

There were 4186 children from 32 publications included. Compared to the control group, the HS group exhibited significant reduction of severity of respiratory distress, included studies used the Clinical Severity Score (n = 8; MD, - 0.71; 95% CI, - 1.15 to - 0.27; I2 = 73%) and full stop after Respiratory Distress Assessment Instrument (n = 5; MD, - 0.60; 95% CI, - 0.95 to - 0.26; I2 = 0%) for evaluation respectively. Further, the HS group decreased the length of hospital stay 0.54 days (n = 20; MD, - 0.54; 95% CI, - 0.86 to - 0.23; I2 = 81%).

CONCLUSIONS

We conclude that nebulization with 3% saline solution is effective in decreasing the length of hospital stay and the severity of symptoms as compared with 0.9% saline solution among children with acute bronchiolitis. Further rigorous randomized controlled trials with large sample size are needed.

Identifying and managing bronchiolitis

Bronchiolitis is a common viral illness that affects the lower respiratory tract of infants and young children. The disease is characterized by wheezing and increased mucus production and can range from mild to severe in terms of respiratory distress. This article reviews the epidemiology, clinical presentation, and treatment of bronchiolitis.

Nebulised normal saline in moderate acute bronchiolitis and pneumonia in a low- to middle-income country: a randomised trial in Papua New Guinea

BACKGROUND

Acute lower respiratory tract infections are the commonest cause of hospitalisation in young children and supportive care remains the cornerstone of management. A randomised open trial was undertaken at the Port Moresby General Hospital Children's Emergency Department (CED) to determine whether nebulised normal saline had beneficial effects.

METHODS

Children <2 years of age presenting with a clinical diagnosis of moderate acute bronchiolitis or moderate pneumonia were randomised to receive standard care alone or with nebulised normal saline administered hourly. The outcomes were the difference in respiratory distress scores (RDS) and oxygen saturation between 0 and 4 hours, and admission rates.

RESULTS

A total of 199 patients participated; 100 patients were randomised to normal saline and 99 to standard care. At 4 hours there was a significant difference in the change of the respiratory distress scores: mean RDS reduced by 3.41 (95% CI 3.0-3.8) in the normal saline group, and for the standard group, the RDS reduced by 1.96 (95% CI 1.5-2.4, p < 0.0001). In those receiving normal saline oxygen saturation measured by pulse oximetry (SpO₂) increased by a mean of 7% (95% CI 6.0-7.9) to 90.7% at 4 hours. For those receiving standard care, the SpO₂ increased by a mean of 4% (95% CI 2.8-5.2) to 87.5% at 4 hours (p < 0.001). Of 100 patients, 58 (58%) in the normal saline group and 24 of 99 (24.2%) in the standard arm were discharged from the Children's Emergency Department (p < 0.001).

CONCLUSIONS

This study supports the use of nebulised normal saline in the treatment of moderate acute bronchiolitis or pneumonia in an emergency department setting in a low- to middle-income country.

ABBREVIATIONS

ALRI, acute lower respiratory infection; CED, Children's Emergency Department; NaCl, sodium chloride; PMGH, Port Moresby General Hospital; PNG, Papua New Guinea; RDS, respiratory distress score; SpO₂, oxygen saturation by pulse oximetry.

Nebulized hypertonic saline 3% for 1 versus 3 days in hospitalized bronchiolitis: a blinded non-inferiority randomized controlled trial

Background

The use and optimal duration of treatment with nebulized hypertonic saline (HS) in infants hospitalized for acute bronchiolitis is unclear. The objective was to compare the efficacy of 1 versus 3 days of nebulized 3% HS at 72 h of treatment. We conducted a blinded non-inferiority randomized controlled trial including infants aged less than 12 months old, hospitalized for a moderate bronchiolitis.

Methods

Nebulisations of 3% HS for 1 day were followed by either the continuation of 3% HS (HS3d group) or switched to 0.9% normal isotonic saline (HS1d group) for 2 days Randomization was performed according to a predefined list with a 1:1 ratio, obtained with a random generator number with blocks.. Main outcome was mean Wang clinical severity score (CSS) after 72 h of treatment.

Results

One hundred sixteen infants (HS1d n = 59 and HS3d n = 57), were included over two epidemic seasons from 2014 to 2016, but recruitement did not reach the planned sample size. The difference for the Wang CSS score in the HS3d vs HS1d group was 0.71 [IC 90% 0.1; 1.3], above the precluded value of 0.4 set in the protocol defining the non-inferiority of shorter treatment duration. Clinical remission was more rapidly obtained in the HS3d than in HS1d (2.3 ± 1.6 vs 2.9 ± 1.4 days, p = 0.04), with a non-significant tendency for less need of nutritional support and supplemental oxygen in HS3d group. Clinical worsening and treatment intolerance were similar in the 2 groups.

Conclusions

Despite being underpowered, results seem not to be in favour of reducing the duration of nebulised HS treatment from 3 to 1 day in acute moderate bronchiolitis.

Trial registration

Clinical trials NCT 02538458, October 2014.

Practice variation in the management of children hospitalized with bronchiolitis: A Canadian perspective

Objectives

To describe variations in the monitoring, treatment, and discharge of children hospitalized with bronchiolitis among physicians across Canadian paediatric teaching hospitals.

Methods

We conducted an electronic survey of paediatricians with experience in the management of inpatient bronchiolitis at 20 Canadian paediatric teaching hospitals. Only physicians who worked a minimum of 6 weeks on their hospital inpatient unit in the 2015 calendar year were eligible to participate in the study. The questionnaire explored the monitoring, treatment, and discharge of children with bronchiolitis. Central tendency (mean) and dispersion (SD) statistics were produced for continuous variables and frequency distributions for categorical variables.

Results

A total of 142 respondents were included in the analysis. 45.1% reported the routine use of continuous oxygen saturation monitoring. 27.5% used a higher cut-off for oxygen supplementation of 92% and 12.7% use a lower cut-off of 88%. 29.6% routinely used deep nasal suctioning. Seventy-three per cent reported using nebulized therapies. 55.6% reported having preprinted order sheets or guidelines for management of inpatient bronchiolitis at their institutions and 28.2% reported having specific discharge criteria. The length of time required to be off oxygen prior to discharge varied (31% at 12 hours, 27.5% at 24 hours, and 24.6% after the last sleep period without oxygen).

Conclusion

There is significant practice variation in the monitoring, treatment, and discharge of children hospitalized with bronchiolitis within and between Canadian paediatric teaching hospitals. Future research is needed to establish best practices, effective knowledge translation, and implementation strategies to standardize care and decrease length of stay.

Efficacy of 3% hypertonic saline in bronchiolitis: A meta-analysis

A meta-analysis was performed to analyze the efficacy of 3% hypertonic saline (HS) in bronchiolitis. Pubmed and MEDLINE databases were searched for relevant articles. A total of 2 authors selected the articles according to the inclusion criteria and then data were carefully extracted. Weighted mean difference (WMD) with 95% confidence interval (95% CI) values were used to pool continuous data, including length of stay and clinical severity score (CSS). Relative risk (RR) with 95% CI was calculated to determine the association between 3% HS and re-admission. The pooled data revealed that infants treated with 3% HS exhibited shorter durations of hospitalization compared with those treated with normal saline (NS; WMD=-0.43; 95% CI=-0.70, -0.15). Subgroup analysis examining the combination of HS or NS with additional medication demonstrated that 3% HS with epinephrine significantly decreased the length of hospital stay, with a WMD=-0.62 (95% CI=-0.90, -0.33). The results indicated a lower CSS score in the 3% HS group compared with the NS group (SMD=-0.80; 95% CI=-1.06, -0.54). The pooled outcome indicated a beneficial effect of 3% HS on decreasing re-admission rates compared with NS (RR=0.93; 95% CI=0.70, 1.23). No potential publication bias was observed (Begg's, P=0.133; Egger's, P=0.576). In conclusion, 3% HS was demonstrated to be a more successful therapy compared with NS for infants with bronchiolitis.

A pilot study of heated and humidified low flow oxygen therapy: An assessment in infants with mild and moderate bronchiolitis (HHOT AIR study)

BACKGROUND

Heated and humidified high flow nasal cannula oxygen therapy has been used in children with severe bronchiolitis. No data exists in children with mild to moderate bronchiolitis requiring lower flows of heated and humidified oxygen therapy.

METHODS

We conducted a prospective, randomized pilot study of standard dry oxygen (control) versus heated and humidified low flow nasal cannula (HHLFNC), <4 liters per minute (LPM) oxygen, (treatment) in healthy children ≤24 months old with bronchiolitis. Clinical assessments were made using Respiratory Distress Assessment Instrument (RDAI), respiratory rate (RR), and oxygen saturation.

RESULTS

Thirty-two children were enrolled (16 participants in each group). There was no significant difference in mean RDAI over time between groups. There was a significant difference in mean RDAI over time within control group, at hour 12, and treatment group, at hour 1, compared to baseline. RDAI in the treatment group was overall lower over time compared to control group. There was no significant difference in mean RR over time between or within groups, between mean length of stay and duration of oxygen requirement. Subgroup analyses showed lower RDAI in subjects that had RSV infection, male gender, and non-black race.

CONCLUSIONS

The use of HHLFNC oxygen therapy may provide more comfort and may result in more rapid improvements in RDAI compared to standard dry oxygen therapy over time. HHFLNC is safe and well tolerated compared to standard dry oxygen. Larger studies are needed to assess the clinical efficacy of HHLFNC oxygen therapy.

Nonmagnetic Hypertonic Saline-Based Implant for Breast Cancer Postsurgical Recurrence Prevention by Magnetic Field/pH-Driven Thermochemotherapy

Magnetic-mediated hyperthermia (MMT) is emerging as one of the promising techniques, which could synergistically treat cancer along with current treatment techniques such as chemotherapy and radiotherapy and trigger on-demand release of therapeutic macromolecules. However, the low specific absorption rate and potential in vivo toxicity of magnetic nanomaterials as the MMT mediators restrict the new advancements in MMT treatment. Herein, for the first trial, the unique inductive heating property of hypertonic saline (HTS), a clinically applied solution exhibiting several physiological effects under alternative magnetic field (AMF), was systematically investigated. Though without magnetic property, due to the dipolar polarization under the electromagnetic radiation, HTS can induce enough high and rapid temperature increase upon exposure under AMF. Based on such an observation, PEG-based HTS hydrogel was fabricated for the inhibition of unwanted diffusion of ions so as to ensure the ideal temperature rise at the targeted region for a longer time. Furthermore, an anticancer drug (doxorubicin) was also incorporated into the hydrogel to achieve the magnetic field/pH stimuli-responsive drug-sustainable release as well as synergistic thermochemotherapy. The potential application of the drug-loaded HTS-PEG-injectable hydrogel for breast cancer postsurgical recurrence prevention is demonstrated. Significant in vivo suppression of two kinds of breast cancer models was achieved by the hybrid hydrogel system. This work explores a new biomedical use of clinical HTS and a promising cancer treatment protocol based on HTS-PEG hydrogel for magnetic hyperthermia combined with stimuli-responsive chemotherapy for breast cancer postsurgical recurrence prevention.

Australasian bronchiolitis guideline

AIM

Bronchiolitis is the most common lower respiratory tract disorder in infants aged less than 12 months, and research has demonstrated that there is substantial variation in practice patterns despite treatment being well defined. In order to align and improve the consistency of the management of bronchiolitis, an evidence-based guideline was developed for the Australasian population.

METHODS

The guideline development committee included representation from emergency and paediatric specialty medical and nursing personnel in addition to geographical representation across Australia and New Zealand - rural, remote and metropolitan. Formulation of the guideline included identification of population, intervention, comparator, outcomes and time questions and was associated with an extensive literature search from 2000 to 2015. Evidence was summarised and graded using the National Health and Medical Research Council and Grading of Recommendations Assessment, Development and Evaluation methodology, and consensus within the guideline group was sought using nominal group technique principles to formulate the clinical practice recommendations. The guideline was reviewed and endorsed by key paediatric health bodies.

RESULTS

The guideline consists of a usable clinical interface for bedside functionality supported by evidence summary and tables. The Grading of Recommendations Assessment, Development and Evaluation and National Health and Medical Research Council processes provided a systematic and transparent process to review and assess the literature, resulting in a guideline that is relevant to the management of bronchiolitis in the Australasian setting.

CONCLUSION

This is the first robust Australasian acute paediatric guideline and provides clear guidance for the management of the vast majority of patients seen in Australasian emergency departments and general paediatric wards with bronchiolitis.

Hypertonic Saline in Bronchiolitis and Type I Error: A Trial Sequential Analysis

: media-1vid110.1542/5799873875001PEDS-VA_2018-1144Video Abstract BACKGROUND AND OBJECTIVES: Meta-analyses of nebulized hypertonic saline (HS) for acute viral bronchiolitis have yielded disparate conclusions. Trial sequential analysis (TSA) is a novel method designed to account for potential sources of error in conventional meta-analysis. We sought to use TSA to determine if the existing literature base is sufficient to draw firm conclusions about the effectiveness of HS in bronchiolitis.

METHODS

We used the cohort of studies identified in previously published conventional meta-analyses. Included studies were those in which authors compared treatment with HS versus normal saline (or supportive care) in children with bronchiolitis to reduce hospital length of stay (LOS) or hospitalizations. TSA results are used to provide a required information size and monitoring boundaries for statistical significance.

RESULTS

For the LOS outcome, 17 studies including 1866 patients analyzed in which authors used conventional meta-analysis reveal a statistically significant benefit (mean difference = -0.41 days; 95% confidence interval = -0.07 to -0.75); however, TSA suggests that those conclusions are premature because of failure to reach the adequate information size of 2665 individuals. For the risk of hospitalization outcome, 8 studies including 1728 patients analyzed in which authors used conventional meta-analysis reveal a reduction in the relative risk of hospitalization (relative risk = 0.86; 95% confidence interval = 0.76 to 0.98); however, TSA suggests these conclusions are premature because of failure to reach the adequate information size of 4770. Both LOS and hospitalization results from conventional meta-analysis would be considered potentially false-positives by TSA.

CONCLUSIONS

TSA reveals that concluding benefit from HS for children with bronchiolitis potentially represents type I error.

Impact of hypertonic saline on hospitalization rate in infants with acute bronchiolitis: A meta-analysis

AIM

This meta-analysis aimed to assess the efficacy of nebulized hypertonic saline (HS) on the rate of hospitalization in infants with acute bronchiolitis in the Emergency Department (ED) setting.

METHOD

We searched PubMed, Virtual Health Library-BVS and Cochrane CENTRAL from inception until January 31, 2018. We selected randomized trials that compared nebulized HS with normal saline (NS) or standard care in children up to 24 months of age with acute bronchiolitis in the ED setting. We conducted random-effects meta-analyses to estimate the risk ratio (RR) and 95% confidence interval (CI).

RESULTS

A total of 293 records were screened and 8 trials involving 1708 patients were included. The meta-analysis showed a 16% reduction in the risk of hospitalization among patients treated with HS compared to NS (risk ratio [RR]: 0.84, 95% confidence interval [CI]: 0.71-0.98, P = 0.03). A significant effect of HS in reducing the risk of hospitalization was found only in the subgroup analyses of trials in which HS was mixed with bronchodilators, multiple doses (≥3) were given, and risk of bias was low.

CONCLUSIONS

Nebulized hypertonic saline may potentially reduce the risk of hospitalization in infants with acute bronchiolitis in the ED setting. Quality of evidence is moderate due to substantial clinical heterogeneity between studies and large multicenter trials are still warranted.

Improving Evidence Based Bronchiolitis Care

Bronchiolitis is the number one cause of hospitalization in infants during the first year of life. Clinical guidelines recommend primarily supportive care and discourage use of pharmacotherapies and diagnostics. However, there continues to be widespread use of non-recommended therapies and variation in the use of therapeutic interventions among hospitals in the United States. Here we review evidence-based management of this common disease in order to optimize resource utilization, decrease healthcare costs, and decrease unnecessary hospitalization. Current evidence does not support the routine use of chest radiographs, viral testing or laboratory evaluation in children with bronchiolitis. In addition, routine administration of bronchodilators, including albuterol and nebulized epinephrine, corticosteroids and hypertonic saline are not recommended for infants and children with bronchiolitis. Intravenous or nasogastric hydration and nutritional support, supplemental oxygen, and respiratory support are recommended. Standardization of bronchiolitis care with evidence based institutional clinical pathways spanning ED to inpatient care can help optimize resource utilization while simultaneously improving care of bronchiolitis and reducing hospital length of stays and costs.

Nebulized hypertonic saline in infants hospitalized with moderately severe bronchiolitis due to RSV infection: A multicenter randomized controlled trial

INTRODUCTION

The efficacy of nebulized hypertonic saline (HS) therapy for shortening hospital length of stay (LOS) or improving bronchiolitic symptoms remains controversial. Most studies enrolled small numbers of subjects and did not consider the role of respiratory syncytial virus (RSV), the most common cause of acute bronchiolitis. Our aim was to evaluate the efficacy and safety of nebulized HS therapy for acute bronchiolitis due to RSV in moderately ill hospitalized infants.

MATERIALS AND METHODS

This was an open-label, multicenter, randomized controlled trial comparing a nebulized HS treatment group with a normal saline (NS) group. The subjects, 128 infants with bronchiolitis due to RSV, were admitted to five hospitals in Tokyo, Japan. Three-percent HS or NS was administered via bronchodilator four times daily post-admission. The primary outcome was LOS, defined as the time until the patients fulfilled the discharge criteria, namely, absence of fever, no need for supplemental oxygen, and adequate feeding. Survival analysis was conducted in accordance with the intention-to-treat principle.

RESULTS

The baseline characteristics were similar between the two groups. There was no significant overall difference in LOS between the groups (4.81 ± 2.14 days in HS vs 4.61 ± 2.18 days in NS; P = 0.60). Survival analysis by log-rank test also showed no significance (P = 0.62). Multivariate adjustment did not significantly alter the results. The treatment was well-tolerated, with no adverse effects attributable to the use of HS.

CONCLUSIONS

Nebulized HS therapy did not significantly reduce LOS among infants with bronchiolitis due to RSV.

Hypertonic saline inhalations in bronchiolitis-A cumulative meta-analysis

We undertook a cumulative meta-analysis for the efficacy of hypertonic saline (HS) compared to normal saline (NS) inhalations or no inhalations as controls in bronchiolitis. We performed literature searches from PubMed, Scopus, and by hand search until 20 June 2017. We accepted published randomized controlled trials of HS inhalations in children with bronchiolitis aged <24 months. We evaluated the differences between treatment group with HS and control group without HS inhalations for the length-of-stay in hospital (LOS) by cumulative mean difference (MD) and in hospitalization rate by cumulative risk ratio (RR). We identified 18 studies including 2102 children treated in hospital, and the cumulative MD in LOS was -0.471 days (95% confidence interval [CI] -0.765 to -0.177, Higgins heterogeneity test [I² ] 72.9%). The cumulative MD reduced in more recently published papers. In studies with the upper age limit of 12 months, the cumulative MD was -0.408 days (95%CI -0.733 to -0.083) without any important heterogeneity (I²  = 0%). If only studies with a very low risk of bias were included, the cumulative MD was 0.034 (95%CI -0.361 to 0.293) without any important heterogeneity (I²  = 0%). We identified eight studies including 1834 children in the outpatient setting, and the cumulative risk ratio for hospitalization was 0.771 (95%CI 0.619-0.959, I² 55.8%). In conclusion, HS inhalations offered only limited clinical benefits, though the differences between HS and control groups were statistically significant. The heterogeneity between the studies was substantial. Further studies are warranted with consistent definitions of bronchiolitis and comparable research frames.

The cost-effectiveness of hypertonic saline inhalations for infant bronchiolitis: a decision analysis

BACKGROUND

This study evaluated the cost-effectiveness of hypertonic saline (HS) inhalations for infant bronchiolitis, compared to normal saline inhalations or standard treatment without inhalations as controls.

METHODS

The decision tree in the decision analysis was used to calculate the expected costs. Actual cost data were obtained from our retrospective case-control study on bronchiolitis treatment. The effectiveness of treatment, based on the hospitalization rate of those admitted to the emergency department and the length of stay (LOS) of those who were hospitalized, was collected from previous studies. For the effectiveness estimations, we made a meta-analysis summarizing the results of the meta-analysis of the Cochrane review in 2013 and the results of 10 studies published after it.

RESULTS

The mean hospitalization rate was 24.7% in the HS inhalation group and 32.6% in the control group [risk ratio: 0.80, 95% confidence interval (CI) 0.67-0.96] and the mean LOS was 3.736 (HS group) and 4.292 (controls) days (mean difference: - 0.55 days, 95% CI - 0.96 to - 0.15), respectively. The expected costs per patient, when both inpatients and outpatients were included, were €816 ($1111) in the HS inhalation group and €962 ($1310) in the control group. The expected costs per hospitalization, when only inpatients were included, were €2600 ($3540) in the HS inhalation group and €2890 ($3935) in the control group.

CONCLUSIONS

HS inhalations slightly reduced the expected hospitalization costs of infant bronchiolitis. However, the low effectiveness, rather than the cost, is the factor that will limit the use of HS inhalations in infant bronchiolitis.

Does nebulized hypertonic saline shorten hospitalization in young children with acute viral wheezing?

BACKGROUND

Although previous studies have shown benefits of nebulized hypertonic saline (HS) for improving airway clearance and shortening hospitalization in infants with bronchiolitis, prospective blinded studies in preschool children with acute viral wheezing are limited.

OBJECTIVES

To determine nebulized 3% HS efficacy in young children admitted with acute viral wheezing.

METHODS

This double-blind, randomized controlled trial was conducted in children aged 6 months to 5 years admitted with acute viral wheezing from July 1st to December 31st 2016. Patients were randomized to receive inhalation of 2.5 mg salbutamol dissolved in either 3% HS or normal saline (NS). Clinical data, asthma clinical severity score, and length of hospital stay (LOS) were recorded.

RESULTS

A total of 47 patients were enrolled (22 in HS and 25 in NS) without significant differences in demographic data and baseline clinical scores. Median LOS and median time of oxygen therapy were significantly shorter in HS than NS group: 48 versus 72 h, P = 0.021 and 36 versus 72 h, P = 0.025, respectively. HS patients had significantly improved asthma clinical severity scores, respiratory rates and oxygen saturation at 12 h compared to NS group (P-value 0.042, 0.032, and 0.043). There were no adverse events.

CONCLUSION

In children under 5 years admitted with acute viral wheezing, nebulized hypertonic saline/salbutamol significantly shortened hospital stay length, time of oxygen therapy, and improved asthma clinical severity score faster than normal saline/salbutamol.

Nebulised hypertonic saline solution for acute bronchiolitis in infants

BACKGROUND

Airway oedema (swelling) and mucus plugging are the principal pathological features in infants with acute viral bronchiolitis. Nebulised hypertonic saline solution (≥ 3%) may reduce these pathological changes and decrease airway obstruction. This is an update of a review first published in 2008, and previously updated in 2010 and 2013.

OBJECTIVES

To assess the effects of nebulised hypertonic (≥ 3%) saline solution in infants with acute bronchiolitis.

SEARCH METHODS

We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, MEDLINE Epub Ahead of Print, In-Process & Other Non-Indexed Citations, Ovid MEDLINE Daily, Embase, CINAHL, LILACS, and Web of Science on 11 August 2017. We also searched the World Health Organization International Clinical Trials Registry Platform (WHO ICTRP) and ClinicalTrials.gov on 8 April 2017.

SELECTION CRITERIA

We included randomised controlled trials and quasi-randomised controlled trials using nebulised hypertonic saline alone or in conjunction with bronchodilators as an active intervention and nebulised 0.9% saline, or standard treatment as a comparator in children under 24 months with acute bronchiolitis. The primary outcome for inpatient trials was length of hospital stay, and the primary outcome for outpatients or emergency department trials was rate of hospitalisation.

DATA COLLECTION AND ANALYSIS

Two review authors independently performed study selection, data extraction, and assessment of risk of bias in included studies. We conducted random-effects model meta-analyses using Review Manager 5. We used mean difference (MD), risk ratio (RR), and their 95% confidence intervals (CI) as effect size metrics.

MAIN RESULTS

We identified 26 new trials in this update, of which 9 await classification due to insufficient data for eligibility assessment, and 17 trials (N = 3105) met the inclusion criteria. We included a total of 28 trials involving 4195 infants with acute bronchiolitis, of whom 2222 infants received hypertonic saline.Hospitalised infants treated with nebulised hypertonic saline had a statistically significant shorter mean length of hospital stay compared to those treated with nebulised 0.9% saline (MD -0.41 days, 95% CI -0.75 to -0.07; P = 0.02, I² = 79%; 17 trials; 1867 infants) (GRADE quality of evidence: low). Infants who received hypertonic saline also had statistically significant lower post-inhalation clinical scores than infants who received 0.9% saline in the first three days of treatment (day 1: MD -0.77, 95% CI -1.18 to -0.36, P < 0.001; day 2: MD -1.28, 95% CI -1.91 to -0.65, P < 0.001; day 3: MD -1.43, 95% CI -1.82 to -1.04, P < 0.001) (GRADE quality of evidence: low).Nebulised hypertonic saline reduced the risk of hospitalisation by 14% compared with nebulised 0.9% saline among infants who were outpatients and those treated in the emergency department (RR 0.86, 95% CI 0.76 to 0.98; P = 0.02, I² = 7%; 8 trials; 1723 infants) (GRADE quality of evidence: moderate).Twenty-four trials presented safety data: 13 trials (1363 infants, 703 treated with hypertonic saline) did not report any adverse events, and 11 trials (2360 infants, 1265 treated with hypertonic saline) reported at least one adverse event, most of which were mild and resolved spontaneously.

AUTHORS' CONCLUSIONS

Nebulised hypertonic saline may modestly reduce length of stay among infants hospitalised with acute bronchiolitis and improve clinical severity score. Treatment with nebulised hypertonic saline may also reduce the risk of hospitalisation among outpatients and emergency department patients. However, we assessed the quality of the evidence as low to moderate.

Network Meta-Analysis Comparing the Efficacy of Therapeutic Treatments for Bronchiolitis in Children

BACKGROUND

This study aims to compare placebo (PBO) and 7 therapeutic regimens-namely, bronchodilator agents (BAs), hypertonic saline (HS), BA ± HS, corticosteroids (CS), epinephrine (EP), EP ± CS, and EP ± HS-to determine the optimal bronchiolitis treatment.

METHODS

We plotted networks using the curative outcome of several studies and specified the relations among the experiments by using mean difference, standardized mean difference, and corresponding 95% credible interval. The surface under the cumulative ranking curve (SUCRA) was used to separately rank each therapy on clinical severity score (CSS) and length of hospital stay (LHS).

RESULTS

This network meta-analysis included 40 articles from 1995 to 2016 concerning the treatment of bronchiolitis in children. All 7 therapeutic regimens displayed no significant difference to PBO with regard to CSS in our study. Among the 7 therapies, BA performed better than CS. As for LHS, EP and EP ± HS had an advantage over PBO. Moreover, EP and EP ± HS were also more efficient than BA. The SUCRA results showed that EP ± CS is most effective, and EP ± HS is second most effective with regard to CSS. With regard to LHS, EP ± HS ranked first, EP ± CS ranked second, and EP ranked third.

CONCLUSIONS

We recommend EP ± CS and EP ± HS as the first choice for bronchiolitis treatment in children because of their outstanding performance with regard to CSS and LHS.

Humidified high-flow nasal cannula oxygen in bronchiolitis reduces need for invasive ventilation but not intensive care admission

AIM

To describe the changes to paediatric intensive care unit (PICU) admission patterns and ventilation requirements for children with bronchiolitis following the introduction of humidified high-flow nasal cannula oxygen outside the PICU.

METHODS

Retrospective study comparing patients <24 months of age with a discharge diagnosis of bronchiolitis admitted to the PICU. A comparison was made between those before humidified high-flow nasal cannula oxygen use (year 2008) to those immediately following the introduction of humidified high-flow nasal cannula oxygen use (year 2011) and those following further consolidation of humidified high-flow nasal cannula oxygen use outside the PICU (year 2013).

RESULTS

Humidified high-flow nasal cannula oxygen use up to 1 L/kg/min in the hospital did not reduce PICU admission. Intubation rates were reduced from 22.2% in 2008 to 7.8% in 2013. There was a non-significant trend towards decreased length of stay in the PICU while hospital length of stay showed a significant decrease following the introduction of humidified high-flow nasal cannula oxygen. Age <6 months and respiratory syncytial virus bronchiolitis were associated with an increased chance of failing humidified high-flow nasal cannula oxygen therapy.

CONCLUSION

Humidified high-flow nasal cannula oxygen utilised outside of the PICU in our institution for children with bronchiolitis did not reduce admission rates or length of stay to the PICU but was associated with a decreasing need for invasive ventilation and reduced hospital length of stay.

Real-life comparison of three general paediatric wards showed similar outcomes for children with bronchiolitis despite different treatment regimens

AIM

This study evaluated the effectiveness of three different treatments for bronchiolitis in a tertiary paediatric facility.

METHODS

Patients with bronchiolitis who were younger than two years of age and were randomly allocated to three general wards at Schneider Children's Medical Center, Israel, after admission were included. Different treatment protocols in the wards were retrospectively compared.

RESULTS

The study comprised 286 children. The clinical and laboratory parameters on admission were similar between the wards. In Ward C where nebulised hypertonic saline was infrequently administered (6.7%), the mean number of days with oxygen saturation under 92% and the meanlength of hospital stay (1.8 and 3.8 days) were significantly lower than Ward A (2.8 and 5.3 days) and Ward B, (2.9 and 4.7 days) where nebulised hypertonic saline was given more frequently (38.7%-74.7%). Multivariate analysis indicated that low saturation on admission, leukocytosis and use of nebulised hypertonic saline or adrenalin were independent predictors of a longer period of desaturation and hospital stay.

CONCLUSION

Different treatment protocols for bronchiolitis were used in three paediatric wards in this real-life study. No treatment regimen proved superior. Inhalations of hypertonic saline or adrenaline were associated with a longer hospital stay.

Effect of Nebulized Hypertonic Saline Treatment in Emergency Departments on the Hospitalization Rate for Acute Bronchiolitis: A Randomized Clinical Trial

IMPORTANCE

Acute bronchiolitis is the leading cause of hospitalization among infants. Previous studies, underpowered to examine hospital admission, have found a limited benefit of nebulized hypertonic saline (HS) treatment in the pediatric emergency department (ED).

OBJECTIVE

To examine whether HS nebulization treatment would decrease the hospital admission rate among infants with a first episode of acute bronchiolitis.

DESIGN, SETTING, AND PARTICIPANTS

The Efficacy of 3% Hypertonic Saline in Acute Viral Bronchiolitis (GUERANDE) study was a multicenter, double-blind randomized clinical trial on 2 parallel groups conducted during 2 bronchiolitis seasons (October through March) from October 15, 2012, through April 15, 2014, at 24 French pediatric EDs. Among the 2445 infants (6 weeks to 12 months of age) assessed for inclusion, 777 with a first episode of acute bronchiolitis with respiratory distress and no chronic medical condition were included.

INTERVENTIONS

Two 20-minute nebulization treatments of 4 mL of HS, 3%, or 4 mL of normal saline (NS), 0.9%, given 20 minutes apart.

MAIN OUTCOMES AND MEASURES

Hospital admission rate in the 24 hours after enrollment.

RESULTS

Of the 777 infants included in the study (median age, 3 months; interquartile range, 2-5 months; 468 [60.2%] male), 385 (49.5%) were randomized to the HS group and 387 (49.8%) to the NS group (5 patients did not receive treatment). By 24 hours, 185 of 385 infants (48.1%) in the HS group were admitted compared with 202 of 387 infants (52.2%) in the NS group. The risk difference for hospitalizations was not significant according to the mixed-effects regression model (adjusted risk difference, -3.2%; 95% CI, -8.7% to 2.2%; P = .25). The mean (SD) Respiratory Distress Assessment Instrument score improvement was greater in the HS group (-3.1 [3.2]) than in the NS group (-2.4 [3.3]) (adjusted difference, -0.7; 95% CI, -1.2 to -0.2; P = .006) and similarly for the Respiratory Assessment Change Score. Mild adverse events, such as worsening of cough, occurred more frequently among children in the HS group (35 of 392 [8.9%]) than among those in the NS group (15 of 384 [3.9%]) (risk difference, 5.0%; 95% CI, 1.6%-8.4%; P = .005), with no serious adverse events.

CONCLUSIONS AND RELEVANCE

Nebulized HS treatment did not significantly reduce the rate of hospital admissions among infants with a first episode of acute moderate to severe bronchiolitis who were admitted to the pediatric ED relative to NS, but mild adverse events were more frequent in the HS group.

TRIAL REGISTRATION

clinicaltrials.gov Identifier: NCT01777347.

The role of mucoactive agents in the mechanically ventilated patient: a review of the literature

INTRODUCTION

The management of airway secretions in the mechanically ventilated patient is a routine task throughout all intensive care units. The current treatment strategies are primarily based on anecdotal experiences rather than statistical evidence. Areas covered: This review article evaluates the data from published trials surrounding mucoactive agents and their use in the critically ill patient population. We completed an extensive search through PUBMED and CINAHL via EBSCO, along with the Cochran library to find all trials using mucoactive agents in the critically ill patient population. Expert commentary: Overall, the role of mucoactive agents in the intensive care unit is a field within pulmonary critical care that is in need of evidence-based recommendations. We feel that there is great opportunity for investigators to evaluate different mucoactive therapies in this patient population and to determine their effect on clinical outcomes.

Viral bronchiolitis

Viral bronchiolitis is a common clinical syndrome affecting infants and young children. Concern about its associated morbidity and cost has led to a large body of research that has been summarised in systematic reviews and integrated into clinical practice guidelines in several countries. The evidence and guideline recommendations consistently support a clinical diagnosis with the limited role for diagnostic testing for children presenting with the typical clinical syndrome of viral upper respiratory infection progressing to the lower respiratory tract. Management is largely supportive, focusing on maintaining oxygenation and hydration of the patient. Evidence suggests no benefit from bronchodilator or corticosteroid use in infants with a first episode of bronchiolitis. Evidence for other treatments such as hypertonic saline is evolving but not clearly defined yet. For infants with severe disease, the insufficient available data suggest a role for high-flow nasal cannula and continuous positive airway pressure use in a monitored setting to prevent respiratory failure.

Viral Lower Respiratory Tract Infections

Lower respiratory tract infections in children are often viral in origin. Unfortunately in this time of significant antimicrobial resistance of infectious organisms, especially bacteria, there is still a tendency for clinicians to manage a child who coughs with antibiotics. In addition, the World Health Organization (WHO) has defined “pneumonia” as a condition that only occurs in children who have “fast breathing or chest wall indrawing”. That would delineate upper respiratory tract infections from those in the lower airway. However, in addition to pneumonia another important entity exists in the lower respiratory tract that is almost always viral in origin. This condition is acute viral bronchiolitis. The concept of “acute lower respiratory tract infection” (ALRTI) has emerged and it is becoming increasing evident from a number of studies that the infectious base of both acute pneumonia (AP) and acute bronchiolitis in children has a mixed etiology of microorganisms. Therefore, whilst certain clinical phenotypes do not require antibiotics the actual microbial etiology is much less distinct.

Bronchiolitis of Infancy Discharge Study (BIDS): a multicentre, parallel-group, double-blind, randomised controlled, equivalence trial with economic evaluation

BACKGROUND

There are no randomised trials of peripheral capillary oxygen saturation (SpO2) targets in acute respiratory infection. Two national guidelines recommended different targets for the management of acute viral bronchiolitis.

OBJECTIVES

To compare the American Academy of Pediatrics guideline target of SpO2 ≥ 90% with the Scottish Intercollegiate Guidelines Network target of SpO2 ≥ 94%.

DESIGN

A multicentre, parallel-group, double-blind, randomised controlled, equivalence trial with economic evaluation.

SETTING

Eight paediatric hospital departments in the UK.

PARTICIPANTS

Infants > 6 weeks and ≤ 12 months of age (corrected for prematurity) with physician-diagnosed bronchiolitis admitted to hospital from a paediatric emergency assessment area. Follow-up for 6 months by standardised telephone contacts.

INTERVENTION

Infants were randomised to a target oxygen saturation of ≥ 94% (standard care) or ≥ 90% (modified care) displayed by a pulse saturation oximeter (Masimo Corporation Limited, CA, USA).

ROUTINE CARE

All infants received routine care in addition to the study intervention. Infants were eligible for discharge when they exhibited a SpO2 of ≥ 94% in room air for 4 hours including a period of sleep and were also feeding adequately (≥ 75% usual volume).

PRIMARY OUTCOME

A total of 615 infants were recruited, of whom 308 were allocated to the standard care group and 307 to the modified care group. The primary outcome was time to cough resolution. There was equivalence at the prespecified variance of ± 2 days [time to cough resolution: standard care group, 15 days; modified care group, 15 days; median difference 1 day (benefit modified), 95% confidence interval (CI) -1 to 2 days].

SECONDARY RESULTS

Return to adequate feeding occurred sooner in infants in the modified care group than in those in the standard care group (19.5 vs. 24.1 hours). This difference was non-equivalent [median difference 2.7 hours (95% CI -0.3 to 7.0 hours) versus prespecified ± 4 hours; post-hoc hazard ratio 1.22 (95% CI 1.04 to 1.44 (p-value = 0.015)]. Parent perspective of the time taken to return to normal was not equivalent, being 12 days in the standard care group compared with 11 days in the modified care group [median difference 1.0 day (95% CI 0.0 to 3.0 days) versus prespecified ± 2 days; post-hoc hazard ratio 1.19 (95% CI 1.00 to 1.41); p-value = 0.043]. At 28 days, SpO2 was equivalent [mean difference 0.11% (95% CI -0.35% to 0.57%), within the 1% prespecified]. The modified care group (55.6%) required oxygen less than the standard care group (73.1%), and for a shorter period (5.7 hours vs. 27.6 hours). Infants in the modified care group were fit for discharge (30.2 hours vs. 44.2 hours, hazard ratio 1.46, 95% CI 1.23 to 1.73; p-value < 0.001) and were discharged (40.9 hours vs. 50.9 hours; hazard ratio 1.28, 95% CI 1.06 to 1.50; p-value < 0.003) sooner than those in the standard care group. There were 35 serious adverse events in the standard care group, compared with 25 in the modified care group. Eight infants in the standard care group and 12 in the modified care group were admitted to a high-dependency unit. By 28 days, 23 infants had been readmitted to hospital in the standard care group and 12 infants in the modified care group. Parents of infants in the modified care group did not experience higher levels of anxiety and, by 14 days, had lost 28% fewer hours to usual activities. NHS costs were £290 lower in the modified care group than in the standard care group, with additional societal costs also being lower in the modified care group.

CONCLUSIONS

Management of infants to a SpO2 target of ≥ 90% is as clinically effective as ≥ 94%, gives rise to no additional safety concerns, and appears to be cost-effective. Future work could focus on the safety and effectiveness of using intermittent oxygen saturation monitoring in secondary care, and to consider what are safe and effective oxygen saturation targets for children with bronchiolitis managed in primary care.

TRIAL REGISTRATION

This trial is registered as ISRCTN28405428.

FUNDING

This project was funded by the NIHR Health Technology Assessment programme. Masimo Corporation Limited, CA, USA, kindly provided oxygen saturation monitors with standard and altered algorithms.

A randomized trial of nebulized 3% hypertonic saline with salbutamol in the treatment of acute bronchiolitis in hospitalized infants

OBJECTIVE

Acute bronchiolitis is a common disorder of infants that often results in hospitalization. Apart from supportive care, no therapy has been shown to influence the course of the disease, except for a possible effect of nebulized hypertonic saline (HS). To determine whether this does have beneficial effects on length of stay in hospital or on severity scores, we undertook a double-blind, randomized, controlled trial in a pediatric department of a Portuguese hospital.

METHODS

Previously healthy infants, younger than 12 months, hospitalized with mild-to-moderate acute viral bronchiolitis were randomized to receive either nebulized 3% (hypertonic, HS) or 0.9% (normal, NS) saline during their entire hospital stay. Primary endpoints were: length of hospital stay and severity scores on each day of hospitalization. Need for supplemental oxygen, further add-on medications and adverse effects were also analyzed.

RESULTS

Sixty-eight patients completed the study (HS: 33; NS: 35). The median length of hospital stay did not differ between groups: HS: 5.6 ± 2.3 days; NS: 5.4 ± 2.1 days (P = 0.747). We found no difference between groups in severity scores from day 1 to day 4. There were no differences in need for supplemental oxygen or add-on medications. Patients in HS group had significantly more cough (46% vs. 20%, P = 0.025) and rhinorrhoe (58% vs. 31%, P = 0.30).

CONCLUSION

This study does not support the use of nebulized HS over NS in therapy of hospitalized children with mild-to-moderate acute viral bronchiolitis.

Duration of Hospitalization in Association with Type of Inhalation Therapy Used in the Management of Children with Nonsevere, Acute Bronchiolitis

BACKGROUND

Acute bronchiolitis is one of the main respiratory emergencies in young children. Although supportive therapy is recommended, substantial inconsistency in the clinical usage of inhaled treatments has been reported. In the present study, we evaluated the association between different types of nebulized therapies in clinical practice and the length of stay (LOS) of young children hospitalized with nonsevere bronchiolitis.

METHODS

Medical records of 195 patients with bronchiolitis, without evidence of pneumonia or congenital/chronic respiratory conditions, were stratified with respect to the type of inhalation therapy received: nebulized albuterol (Group 1, n = 53), nebulized albuterol with 3% saline (Group 2, n = 38), nebulized 3% saline alone (Group 3, n = 33), or no inhaled treatment (Group 4, n = 71). Duration of hospital stay was reported with respect to the type of inhalation therapy received after controlling for variability in patient age (months), oxygen saturation, respiratory score, and use of other treatments (antibiotics, oxygen supplementation, and/or corticosteroids). LOS is presented in terms of mean and 95% confidence interval (95% CI).

RESULTS

The groups were similar except for differences in the mean level of oxygen saturation, respiratory score, and corticosteroid use. Children in Group 4 had the lowest mean respiratory score due to a lesser prevalence of wheezing and/or retractions than in other groups. The LOS for children in Groups 1 and 4 was shorter (43.2 hours, 95% CI 34.9-51.3, and 44.1 hours, 95% CI 37.3-51.0, respectively) than in Groups 2 and 3 (72 hours, 95% CI 62.1-81.6, and 65.1 hours, 95% CI 54.7-75.6, respectively) (p < 0.02). The mean LOS in each group did not change significantly after adjustment for covariants.

CONCLUSION

Prolonged hospitalization of children younger than 2 years with acute, nonsevere bronchiolitis is associated with administration of nebulized 3% saline, independent of age, clinical presentation of disease, or inclusion of other treatments in their management.

Hypertonic Saline for the Treatment of Bronchiolitis in Infants and Young Children: A Critical Review of the Literature

Bronchiolitis, an infection of the lower respiratory tract, is the leading cause of infant and child hospitalization in the United States. Therapeutic options for management of bronchiolitis are limited. Hypertonic saline inhalation therapy has been studied in numerous clinical trials with mixed results. In 2014, the American Academy of Pediatrics (AAP) published updated guidelines on the diagnosis and management of bronchiolitis, which include new recommendations on the use of hypertonic saline. We reviewed all published clinical trials mentioned in the 2014 AAP guidelines, as well as additional trials published since the guidelines, and critically evaluated each trial to determine efficacy, safety, and expectations of hypertonic saline inhalation therapy. A total of 2682 infants were studied over the course of 22 clinical trials. Nine trials were carried out in the outpatient/clinic/emergency department and 13 in the inpatient setting. We agree with the AAP guidelines regarding the recommendation to use nebulized hypertonic saline for infants hospitalized with bronchiolitis, with the expectation of reducing bronchiolitis scores and length of stay when it is expected to last more than 72 hours. However, we also believe there might be an advantage for hypertonic saline in reducing admission rates from the emergency department, based on close examination of the results of recent trials. This review also highlights important gaps in the available literature that need to be addressed in order to define the role of inhaled hypertonic saline therapy.

Latest options for treatment of bronchiolitis in infants

Bronchiolitis is the most frequent pathology associated with lower respiratory tract infection in newborns and young infants. The treatment of bronchiolitis is essentially supportive therapy for respiratory distress, hypoxia and dehydration. To date, no specific antiviral drug is used on a routine basis for the treatment of RSV infections. Currently, the only antiviral drug approved for the infection is ribavirin; however, its use is limited due to adverse side effects and the risks it poses to healthcare providers. Moreover, several drugs have been routinely administered for years in infants with acute RSV bronchiolitis, even if their efficacy is often not confirmed by clinical evidence, and studies on emerging antiviral drugs are still ongoing. In the present paper we review the recent literature about the drugs used during acute bronchiolitis and we summarize the main recommendations of national and international guidelines and the latest options for the treatment of bronchiolitis.

Recent advances in paediatric respiratory medicine

This review highlights important advances in paediatric respiratory medicine since 2014, excluding cystic fibrosis. It focuses mainly on the more common conditions, bronchopulmonary dysplasia, bronchiolitis and preschool wheezing, asthma, pneumonia and sleep, and highlights some of the rarer conditions such as primary ciliary dyskinesia and interstitial lung disease (ILD).

Medication Repurposing in Pediatric Patients: Teaching Old Drugs New Tricks

OBJECTIVES

Gaps in pediatric therapeutics often result in off-label use and specifically, novel uses for existing medications, termed "drug repurposing." Drug Information (DI) queries to a Pediatric Medication Resource Center of a large metropolitan pediatric hospital in New York and inherent difficulties in retrieving evidence-based information prompted a review of current medication repurposing for pediatric patients. The objective included characterization of innovative off-label use of medications Food and Drug Administration (FDA)-approved for 1 or more indications to treat a totally different disorder or indication in pediatric patients.

METHODS

A systematic literature review was conducted to retrieve publications describing repurposed medications in pediatric patients. Excluded was FDA-approved indications used off-label in pediatric patients (e.g., different dose), preclinical data, adult use only, and experimental use. Evidence quality was classified using a modified American Academy of Neurology Level of Evidence. Results were analyzed using χ(2) at p < 0.05.

RESULTS

Over 2000 references were retrieved and reviewed. A total of 101 medications repurposed for novel off-label uses for pediatric patients were identified: 38 for neonates, 74 for children, and 52 for adolescents. Neonates and infants were least likely to receive a medication for a repurposed use. Strong or intermediate evidence existed in 80.2% of cases. The evidence was weak in 19.8%. No significant relationship was observed between the pediatric age group and strength of the literature. Most repurposed uses pertained to generic or widely used medications. Less than 5% of medications were first marketed after 2011.

CONCLUSIONS

While not exhaustive, the present study represents the most comprehensive listing of novel uses exclusive to pediatric patients. Further research is needed to identify the frequency of repurposed uses. The valuable DI role of pharmacists in assessing repurposed uses is of expanding and increasing importance to ensure such uses are evidence-based.

3% Hypertonic Saline Versus Normal Saline in Inpatient Bronchiolitis: A Randomized Controlled Trial

BACKGROUND AND OBJECTIVES

Bronchiolitis, the most common reason for hospitalization in children younger than 1 year in the United States, has no proven therapies effective beyond supportive care. We aimed to investigate the effect of nebulized 3% hypertonic saline (HS) compared with nebulized normal saline (NS) on length of stay (LOS) in infants hospitalized with bronchiolitis.

METHODS

We conducted a prospective, randomized, double-blind, controlled trial in an urban tertiary care children's hospital in 227 infants younger than 12 months old admitted with a diagnosis of bronchiolitis (190 completed the study); 113 infants were randomized to HS (93 completed the study), and 114 to NS (97 completed the study). Subjects received 4 mL nebulized 3% HS or 4 mL 0.9% NS every 4 hours from enrollment until hospital discharge. The primary outcome was median LOS. Secondary outcomes were total adverse events, subdivided as clinical worsening and readmissions.

RESULTS

Patient characteristics were similar in groups. In intention-to-treat analysis, median LOS (interquartile range) of HS and NS groups was 2.1 (1.2-4.6) vs 2.1 days (1.2-3.8), respectively, P = .73. We confirmed findings with per-protocol analysis, HS and NS groups with 2.0 (1.3-3.3) and 2.0 days (1.2-3.0), respectively, P = .96. Seven-day readmission rate for HS and NS groups were 4.3% and 3.1%, respectively, P = .77. Clinical worsening events were similar between groups (9% vs 8%, P = .97).

CONCLUSIONS

Among infants admitted to the hospital with bronchiolitis, treatment with nebulized 3% HS compared with NS had no difference in LOS or 7-day readmission rates.

Hypertonic saline (HS) for acute bronchiolitis: Systematic review and meta-analysis

BACKGROUND

Acute bronchiolitis is the commonest cause of hospitalisation in infancy. Currently management consists of supportive care and oxygen. A Cochrane review concluded that, "nebulised 3 % saline may significantly reduce the length of hospital stay". We conducted a systematic review of controlled trials of nebulised hypertonic saline (HS) for infants hospitalised with primary acute bronchiolitis.

METHODS

Searches to January 2015 involved: Cochrane Central Register of Controlled Trials; Ovid MEDLINE; Embase; Google Scholar; Web of Science; and, a variety of trials registers. We hand searched Chest, Paediatrics and Journal of Paediatrics on 14 January 2015. Reference lists of eligible trial publications were checked. Randomised or quasi-randomised trials which compared HS versus either normal saline (+/- adjunct treatment) or no treatment were included. Eligible studies involved children less than 2 years old hospitalised due to the first episode of acute bronchiolitis. Two reviewers extracted data to calculate mean differences (MD) and 95 % Confidence Intervals (CIs) for length of hospital stay (LoS-primary outcome), Clinical Severity Score (CSS) and Serious Adverse Events (SAEs). Meta-analysis was undertaken using a fixed effect model, supplemented with additional sensitivity analyses. We investigated statistical heterogeneity using I(2). Risk of bias, within and between studies, was assessed using the Cochrane tool, an outcome reporting bias checklist and a funnel plot.

RESULTS

Fifteen trials were included in the systematic review (n = 1922), HS reduced mean LoS by 0.36, (95 % CI 0.50 to 0.22) days, but with considerable heterogeneity (I(2) = 78 %) and sensitivity to alternative analysis methods. A reduction in CSS was observed where assessed [n = 516; MD -1.36, CI -1.52, -1.20]. One trial reported one possible intervention related SAE, no other studies described intervention related SAEs.

CONCLUSIONS

There is disparity between the overall combined effect on LoS as compared with the negative results from the largest and most precise trials. Together with high levels of heterogeneity, this means that neither individual trials nor pooled estimates provide a firm evidence-base for routine use of HS in inpatient acute bronchiolitis.

Epinephrine Improves the Efficacy of Nebulized Hypertonic Saline in Moderate Bronchiolitis: A Randomised Clinical Trial

Background and Aims

There is no evidence that the epinephrine-3% hypertonic saline combination is more effective than 3% hypertonic saline alone for treating infants hospitalized with acute bronchiolitis. We evaluated the efficacy of nebulized epinephrine in 3% hypertonic saline.

Patients and Methods

We performed a randomized, double-blind, placebo-controlled clinical trial in 208 infants hospitalized with acute moderate bronchiolitis. Infants were randomly assigned to receive nebulized 3% hypertonic saline with either 3 mL of epinephrine or 3 mL of placebo, administered every four hours. The primary outcome measure was the length of hospital stay.

Results

A total of 185 infants were analyzed: 94 in the epinephrine plus 3% hypertonic saline group and 91 in the placebo plus 3% hypertonic saline group. Baseline demographic and clinical characteristics were similar in both groups. Length of hospital stay was significantly reduced in the epinephrine group as compared with the placebo group (3.94 ±1.88 days vs. 4.82 ±2.30 days, P = 0.011). Disease severity also decreased significantly earlier in the epinephrine group (P = 0.029 and P = 0.036 on days 3 and 5, respectively).

Conclusions

In our setting, nebulized epinephrine in 3% hypertonic saline significantly shortens hospital stay in hospitalized infants with acute moderate bronchiolitis compared to 3% hypertonic saline alone, and improves the clinical scores of severity from the third day of treatment, but not before.

Trial Registration

EudraCT 2009-016042-57