Childhood asthma hospitalizations in the United States, 2000-2009

Non-invasive positive pressure ventilation for acute asthma in children

BACKGROUND

Asthma is one of the most common reasons for hospital admission among children, with significant economic burden and impact on quality of life. Non-invasive positive pressure ventilation (NPPV) is increasingly used in the care of children with acute asthma, although the evidence supporting it is weak, and clinical guidelines do not offer any recommendations on its routine use. However, NPPV might be an effective way to improve outcomes for some children with asthma. A previous review did not demonstrate a clear benefit, but was limited by few studies with small sample sizes. This is an update of the previous review.

OBJECTIVES

To assess the benefits and harms of NPPV as an add-on therapy to usual care (e.g. bronchodilators and corticosteroids) in children (< 18 years) with acute asthma.

SEARCH METHODS

We searched the Cochrane Airways Group Specialised Register, CENTRAL, MEDLINE, and Embase. We also conducted a search of ClinicalTrials.gov and the WHO ICTRP. We searched all databases from their inception to March 2023, with no restrictions on language of publication.

SELECTION CRITERIA

We included randomised clinical trials (RCTs) assessing NPPV as add-on therapy to usual care versus usual care for children hospitalised for acute asthma exacerbations.

DATA COLLECTION AND ANALYSIS

We used standard Cochrane methods.

MAIN RESULTS

We included three RCTs randomising 60 children with acute asthma to NPPV and 60 children to control. All included trials assessed the effects of bilevel positive airway pressure (BiPAP) for acute asthma in a paediatric intensive care unit (PICU) setting. None of the trials used continuous positive airway pressure (CPAP). The controls received standard care. The median age of children ranged from three to six years, and asthma severity ranged from moderate to severe. Our primary outcome measures were all-cause mortality, serious adverse events, and asthma symptom score. Secondary outcomes were non-serious adverse events, health-related quality of life, arterial blood gases and pH, pneumonia, cost, and PICU length of stay. None of the trials reported any deaths or serious adverse events (except one trial that reported intubation rate). Two trials reported asthma symptom score, each demonstrating reductions in asthma symptoms in the BiPAP group. In one trial, the asthma symptom score was (mean difference (MD) -2.50, 95% confidence interval (CI) -4.70 to -0.30, P = 0.03; 19 children) lower in the BiPAP group. In the other trial, a cross-over trial, BiPAP was associated with a lower mean asthma symptom score (MD -3.7; 16 children; very low certainty evidence) before cross-over, but investigators did not report a standard deviation, and it could not be estimated from the first phase of the trial before cross-over. The reduction in both trials was above our predefined minimal important difference. Overall, NPPV with standard care may reduce asthma symptom score compared to standard care alone, but the evidence is very uncertain. The only reported serious adverse event was intubation rate in one trial. The trial had an intubation rate of 40% and showed that BiPAP may result in a large reduction in intubation rate (risk ratio 0.47, 95% CI 0.23 to 0.95; 78 children), but the evidence is very uncertain. Post hoc analysis showed that BiPAP may result in a slight decrease in length of PICU stay (MD -0.87 day, 95% CI -1.52 to -0.22; 100 children), but the evidence is very uncertain. Meta-analysis or Trial Sequential Analysis was not possible because of insufficient reporting and different scoring systems. All three trials had high risk of bias with serious imprecision of results, leading to very low certainty of evidence.

AUTHORS' CONCLUSIONS

The currently available evidence for NNPV is uncertain. NPPV may lead to an improvement in asthma symptom score, decreased intubation rate, and slightly shorter PICU stay; however, the evidence is of very low certainty. Larger RCTs with low risk of bias are warranted.

OnetoMap Meta-Data: Healthcare Analytics Through Research

INTRODUCTION

Big Data has revolutionized healthcare research through the three Vs: volume, veracity, and variety. This study introduces the OnetoMap meta-data repository, a centralized inventory developed in collaboration with the University of South Florida's Department of Surgery.

METHODS

The repository offers extensive details about each database, including its primary purpose, available variables, and examples of high-impact research utilizing these databases. It aims to create a centralized inventory, enabling researchers to locate and link relevant datasets efficiently. Each dataset is described using standardized criteria to ensure clarity and usability, such as data type, source, collection methods, and potential linkages to other datasets.  Results: Currently, the OnetoMap repository contains descriptions of 49 datasets, with ongoing updates to include new datasets and additional data years. These datasets include a range of data types, including cross-sectional and longitudinal, gathered through claims, registries, electronic health records, and surveys. The repository is hosted on GitHub, enabling version control, collaboration, and open access. Effective search functionalities and descriptive categorization enhance the findability of datasets.

DISCUSSION

The data repository includes comprehensive records of patient health statuses, socioeconomic profiles, hospital structures, and physician practices, enabling nuanced interventions and addressing complex healthcare needs. It also promotes interdisciplinary research and accelerates novel discoveries by providing a centralized source of diverse data and facilitating collaboration among research teams.

CONCLUSION

The OnetoMap meta-data repository represents a significant advancement in healthcare research by providing a centralized, detailed, and easily accessible repository of clinical research databases. Future directions include implementing automatic annual updates of datasets, exploring automatic dataset linkage, providing monthly updates on published research, creating a user chat space for enhanced collaboration, and developing code applets for simplified data analysis. These efforts will ensure that the repository remains current, functional, and accessible, ultimately facilitating new discoveries and insights in healthcare outcomes research.

Reducing Time from Pediatric Emergency Department Arrival to Dexamethasone Administration in Wheezing Patients

Introduction

Asthma exacerbations are common presentations to pediatric emergency departments. Standard treatment for moderate-to-severe exacerbations includes administration of oral corticosteroids concurrently with bronchodilators. Early administration of corticosteroids has been shown to decrease emergency department length of stay (LOS) and hospitalizations. Our SMART aim was to reduce the time from arrival to oral corticosteroids (dexamethasone) administration in pediatric patients ≥2 years of age with an initial Pediatric Asthma Severity Score >6 from 60 to 30 minutes within 6 months.

Methods

We used the model for improvement with collaboration between ED physicians, nursing, pharmacy, and respiratory therapists. Interventions included nursing education, dosage rounding in the electronic medical record, supplying triage with 1-mg tablets and a pill crusher, updates to an asthma nursing order set and pertinent chief complaints triggering nurses to document a Pediatric Asthma Severity Score in the electronic medical record and use the order set. Our primary outcome measure was the time from arrival to dexamethasone administration. Secondary outcome measures included ED LOS for discharged patients and admission rate. We used statistical process control to analyze changes in measures over time.

Results

From October 2021 to March 2022, the average time for dexamethasone administration decreased from 59 to 38 minutes. ED LOS for discharged asthma exacerbation patients rose with overall ED LOS for all patients during the study period. There was no change in the admission rate.

Conclusions

Using quality improvement methodology, we successfully decreased the time from ED arrival to administration of dexamethasone in asthma exacerbation patients from 59 to 38 minutes over 10 months.

Differences in Health Care Utilization for Asthma by Children with Medicaid versus Private Insurance

Asthma is the most common chronic disease in children, disproportionately affects families with lower incomes, and is a leading reason for acute care visits and hospitalizations. This retrospective cohort study used the Massachusetts All Payer Claims Database (2014-2018) to examine differences in acute care utilization and quality of care for asthma between Medicaid- and privately insured children in Massachusetts. Outcomes included acute care use (emergency department [ED] or hospitalization), ED visits with asthma, routine asthma visits, and filled prescriptions for asthma medications. Multivariable logistic regression was used to account for differences in demographics, ZIP codes, health status, and asthma severity. Overall, 10.0% of Medicaid-insured children and 5.6% of privately insured were classified as having asthma. Among 317,596 child-year observations for children with asthma, 64.4% were insured by Medicaid. Medicaid-insured children had higher rates of any acute care use (50.4% vs. 30.0%) and ED visits with an asthma diagnosis (27.2% vs. 13.3%) compared to privately insured children. Only 65.4% of Medicaid enrollees had at least one routine asthma visit compared to 74.3% of privately insured children. Most children received at least one asthma medication (88.6% Medicaid vs. 83.3% privately insured), but a higher percentage of Medicaid-insured children received at least one rescue medication (84.0% vs. 73.7%), and a lower percentage of Medicaid-insured (46.1% vs. 49.2%) received a controller medication. These results suggest that opportunities for improvement in childhood asthma persist, particularly for children insured by Medicaid.

Feasibility of text message follow-up for pediatric asthma care after an emergency department visit

Background: Many children seen in the Emergency Department (ED) for asthma do not follow-up with their primary care provider. Text messaging via short message service (SMS) is a ubiquitous, but untested means of providing post-ED asthma follow-up care.Objective: To evaluate responses to an asthma assessment survey via SMS following an ED visit and estimate the likelihood of response by sociodemographic and clinical characteristics. Methods: We recruited 173 parents of children 2-17 years-old presenting for ED asthma care to receive a follow-up text (participation rate: 85%). One month later, parents received via SMS a 22-item survey that assessed asthma morbidity. We assessed response rates overall and by various sociodemographic and clinical characteristics, including age, parental education, and indicators of asthma severity.Results: Overall, 55% of parents (n = 95) responded to the SMS survey. In multivariable logistic regression (MLR), parents who graduated high school had a four-fold higher response rate compared to parents with less than a high school degree (OR: 4.05 (1.62, 10.13)). More parents of children with oral steroid use in the prior 12 months responded to survey items (OR: 2.53 (1.2, 5.31)). Reported asthma characteristics included: 48% uncontrolled, 22% unimproved/worse, 21% with sleep disruption, and 10% who were hospitalized for asthma.Conclusions: Text messaging may be a viable strategy to improve post-ED asthma assessment and to identify children with persistent symptoms in need of enhanced care or modification of care plans.

Obstructive sleep apnea is associated with use of assisted ventilation among children with bronchopulmonary dysplasia hospitalized with respiratory illness: A nationwide inpatient cohort

OBJECTIVE (S)

Children with bronchopulmonary dysplasia (BPD) are at higher risk of respiratory insufficiency during respiratory illness. We aimed to investigate whether obstructive sleep apnea (OSA) is associated with increased morbidity among children with BPD hospitalized with acute respiratory illnesses.

STUDY DESIGN

Hospital discharge records were obtained from the Kid's Inpatient Database for children <21 years of age with BPD hospitalized for acute respiratory illness between 1997 and 2012. Acute respiratory illnesses included bacterial and/or viral pneumonia, bronchiolitis, acute upper respiratory tract infections, aspiration pneumonia, or asthma exacerbation. The primary exposure was OSA. The primary outcome was invasive mechanical ventilation (IMV), and secondary outcomes were noninvasive mechanical ventilation (NIMV), length of hospital stay (LOS), and inflation-adjusted cost of hospitalization (IACH). Multivariable regression was conducted to ascertain the associations between OSA and primary and secondary outcomes accounting for BPD-associated comorbidities.

RESULTS

Among 33,640 hospitalizations of children with BPD for acute respiratory illness, there were 607 (1.8%) cases with comorbid OSA vs. 33,033 (98.2%) controls without OSA. Patients with OSA were more likely to have aspiration pneumonia, central sleep apnea, obesity, laryngeal stenosis, congenital airway, and skull/face/jaw anomalies. Multivariable regression showed that OSA was associated with IMV (OR 1.45, 95% CI 1.09-1.94, p = 0.012) and NIMV (OR 2.61, 95% CI 1.71-3.98, p < 0.001), but not LOS or IACH.

CONCLUSIONS

In BPD patients hospitalized with acute respiratory illness, having OSA is associated with increased risks for respiratory insufficiency requiring noninvasive or invasive mechanical ventilation. Clinicians should consider OSA, along with other BPD-associated comorbidities, in the management of this population.

Pediatric Respiratory Illnesses: An Update on Achievable Benchmarks of Care

BACKGROUND AND OBJECTIVES

Pediatric respiratory illnesses (PRI): asthma, bronchiolitis, pneumonia, croup, and influenza are leading causes of pediatric hospitalizations, and emergency department (ED) visits in the United States. There is a lack of standardized measures to assess the quality of hospital care delivered for these conditions. We aimed to develop a measure set for automated data extraction from administrative data sets and evaluate its performance including updated achievable benchmarks of care (ABC).

METHODS

A multidisciplinary subject-matter experts team selected quality measures from multiple sources. The measure set was applied to the Public Health Information System database (Children's Hospital Association, Lenexa, KS) to cohorts of ED visits and hospitalizations from 2017 to 2019. ABC for pertinent measures and performance gaps of mean values from the ABC were estimated. ABC were compared with previous reports.

RESULTS

The measure set: PRI report includes a total of 94 quality measures. The study cohort included 984 337 episodes of care, and 82.3% were discharged from the ED. Measures with low performance included bronchodilators (19.7%) and chest x-rays (14.4%) for bronchiolitis in the ED. These indicators were (34.6%) and (29.5%) in the hospitalized cohort. In pneumonia, there was a 57.3% use of narrow spectrum antibiotics. In general, compared with previous reports, there was improvement toward optimal performance for the ABCs.

CONCLUSIONS

The PRI report provides performance data including ABC and identifies performance gaps in the quality of care for common respiratory illnesses. Future directions include examining health inequities, and understanding and addressing the effects of the coronavirus disease 2019 pandemic on care quality.

Effects of Ambient Air Pollutants on Hospital Admissions among Children Due to Asthma and Wheezing-Associated Lower Respiratory Infections in Mysore, India: A Time Series Study

Air pollutants are known to trigger asthma and wheezing-associated lower respiratory infections in children, but evidence regarding their effect on hospital admissions in India is limited. We conducted a time-series study over a period of five years to assess the role of ambient air pollutants in daily asthma-related hospital admissions in children in Mysore, India. Daily asthma and wheeze (associated with lower respiratory infections) admissions were modelled using a generalised additive model (GAM) to examine the non-linear effects and generalised linear models (GLM) for linear effects, if any. Models were adjusted by day of the week and lag days, with smooth terms for time, maximum temperature, and relative humidity, and they were stratified by sex and age group. Of the 362 children admitted, more than 50% were boys, and the mean age was 5.34 years (±4.66). The GAMs showed non-linear associations between NO2, PM2.5, and NH3. For example, a 10 µgm-3 (or 10%) increase in NO2 increased admissions by 2.42. These non-linear effects were more pronounced in boys. A linear effect was detected for PM10 with a relative risk (95% CI) of 1.028, 1.013, and 1.043 with admission. Further research is needed to explore whether these findings can be replicated in different cities in India. Air pollution needs to be controlled, and policies that focus on lower cut-off levels for vulnerable populations are necessary.

Early Intravenous Magnesium Sulfate Administration in the Emergency Department for Severe Asthma Exacerbations

BACKGROUND

Severe asthma exacerbations in pediatric patients occur frequently and can require pediatric intensive care unit (PICU) admission.

OBJECTIVE

To determine if early administration of intravenous magnesium sulfate (IVMg) to pediatric patients experiencing severe asthma exacerbations, defined as a respiratory clinical score (RCS) of 9 to 12, resulted in fewer PICU admissions.

METHODS

Retrospective chart review of pediatric patients aged from 2 to 17 years presenting with a severe asthma exacerbation to a single tertiary care pediatric emergency department. Univariable and multivariable logistic regression analyses were used to determine if admission to the PICU was associated with early IVMg treatment, within 60 minutes of registration.

RESULTS

A total of 1911 patients were included in the study, of which 1541 received IVMg. The average time to IVMg was 79 minutes, with 35% of the patients receiving it within 60 minutes of arrival. Two hundred forty-eight (13%) were admitted to the PICU, 641 (34%) were admitted to the general inpatient floor, and 1022 (53%) were discharged home. Factors associated with increased odds ratio (OR) of PICU admission were: early IVMg (OR, 1.63; 95% CI: 1.16-2.28), arrival mode to the emergency department via ambulance (OR, 2.23; 95% CI: 1.45-3.43), history of PICU admission for asthma (OR, 1.73; 95% CI: 1.22-2.44), and diagnosis of status asthmaticus (OR, 8.88; 95% CI: 3.49-30.07). Calculated OR of PICU admission subcategorized by RCS for early IVMg patients, after controlling for PICU risk factors, are as follows: RCS 9 (reference), RCS 10 (OR, 2.52; 95% CI: 0.89-2.23), RCS 11 (OR, 2.19; 95% CI: 1.3-3.70), and RCS 12 (OR, 4.12; 95% CI: 2.13-7.95).

CONCLUSIONS

Early administration of IVMg to pediatric patients experiencing severe asthma exacerbations does not result in fewer PICU admissions.

Trends in hospital admissions among children with asthma in Spain (2011-2020)

The purpose of this study is to describe and assess changes in incidence, clinical conditions, use of mechanical ventilation, length of hospital stay (LOHS), and in-hospital mortality (IHM) among children hospitalized with asthma in Spain from 2011 to 2020. We analyzed children aged 0 to 15 years hospitalized with an ICD code for asthma included in the Spanish National Hospital Discharge Database (SNHDD). The analysis was conducted for asthma as the primary diagnosis and with asthma in any diagnosis position. Joinpoint regression was used to assess time trends in incidence. We included a total of 85,664 children hospitalized with asthma; of these, 46,727 (54.55%) had asthma coded as the primary diagnosis. The number of boys was higher than the number of girls, irrespective of age group or diagnostic position. The frequency of asthma as primary diagnosis decreased from 55.7% in 2011 to 43.96% in 2020 (p < 0.001). The incidence of hospitalizations because of asthma decreased significantly from 2011 to 2020, with a faster decrease from 2018 onwards. Over time, the proportion of older children increased. In the year 2020, only 55 children had codes for asthma and COVID-19 in their discharge report, and this infection had no effect on hospitalizations this year. A significant increase in the use of non-invasive ventilation (NIV) was observed over time. Irrespective of the diagnostic position, LOHS and IHM remained stable over time, with the IHM under 0.1%.  Conclusion: Our results show a decrease in the incidence of hospital admissions with asthma either as the primary diagnosis or in any position. The age of children hospitalized seems to be increasing as the use of NIV. Better management of the disease from primary care and the emergency department as is the use of NIV could explain the reduction in incidence. What is Known: • Asthma is the most common chronic respiratory in childhood in high income countries. • The incidence of hospital admissions with asthma and associated factors is one of the best sources of information on morbidity trends and prognosis. What is New: • The incidence of hospital admissions for asthma in Spain decreased in children between 2011 and 2020 with a more frequent use of non-invasive mechanical ventilation and low mortality rates. • COVID-19 did not cause an increase in admissions with asthma in the year 2020.

Changes in the Use of Invasive and Noninvasive Mechanical Ventilation in Pediatric Asthma: 2009-2019

Rationale: Despite lower overall hospitalization rates for asthma in recent years, there has been an increase in the number of pediatric patients receiving intensive care management in the United States. Objectives: To investigate how the use of invasive and noninvasive mechanical ventilation for asthma has changed in the context of an evolving cohort of critically ill pediatric patients with asthma. Methods: We analyzed children admitted to intensive care units for asthma from 2009 through 2019 in the Virtual Pediatric Systems database. Regression analyses were used to evaluate how respiratory support interventions, mortality, and patient characteristics have changed over time. Odds ratios were calculated to determine how patient characteristics were associated with respiratory support needs. Stratified analyses were performed to determine how changing practice patterns may have differed between patient subgroups. Results: There were 67,614 admissions for 56,727 patients analyzed. Intubation occurred in 4.6% of admissions and decreased from 6.9% to 3.4% over time (P < 0.001), whereas noninvasive ventilation as the maximal respiratory support increased from 8.9% to 20.0% (P < 0.001). Over time, the cohort shifted to include more 2- to 6-year-olds and patients of Asian/Pacific Islander or Hispanic race/ethnicity. Although intubation decreased and noninvasive ventilation increased in all subgroups, the changes were most pronounced in the youngest patients and slightly less pronounced for obese patients. Conclusions: In pediatric asthma, use of intubation has halved, whereas use of noninvasive ventilation has more than doubled. This change in practice appears partially related to a younger patient cohort, although other factors merit exploration.

Ensuring equitable access to guideline-based asthma care across the lifespan: Tips and future directions to the successful implementation of the new NAEPP 2020 guidelines, a Work Group Report of the AAAAI Asthma, Cough, Diagnosis, and Treatment Committee

The most recent recommendations from the 2020 National Asthma Education and Prevention Program Update and Global Initiative for Asthma 2021 guide evidence-based clinical decision making. However, given the present state of health disparities by age, income, and race, the equitable implementation and dissemination of these guidelines will be unlikely without further guidance. This work group report reviews the current state of the new asthma guideline implementation; presents updated evidence-based therapeutic options with attention to specific patient populations; and addresses barriers to the implementation of these guidelines in minoritized, historically marginalized, and underresourced communities. Allergists and immunologists can use practical ways to accomplish the goals of improved asthma care access and advanced asthma care across the life span, with specific considerations to historically marginalized populations. Modifiable barriers to guideline implementation include financial barriers, environmental factors, and allergy subspecialty access and care coordination. Various programs to improve access to guideline-based asthma care include community programs, school-based asthma programs, and digital health solutions, with an emphasis on reducing disparities by race.

Paediatric asthma hospitalisations continue to decrease in Finland and Sweden between 2015 and 2020

We previously reported a decreasing incidence of paediatric asthma hospitalisations in Finland, but a rather stable trend in Sweden, between 2005 and 2014. We now aimed to investigate the incidence of paediatric asthma hospitalisations in these countries between 2015 and 2020, using Finland's National Hospital Discharge Register and Sweden's National Patient Register, which cover all hospitalisations in the respective countries. From 2015 to 2019, the incidence of paediatric asthma hospitalisations decreased by 36.7% in Finland and by 39.9% in Sweden and are increasingly approaching parity. In 2020, despite differences in COVID-19-related restrictions, asthma hospitalisations decreased by over 40%, thus warranting future research on the subject.

Inpatient albuterol spacing as an indicator of discharge readiness

INTRODUCTION

In children admitted for asthma exacerbation, multiple evidence-based, clinical practice guidelines exist to identify readiness for discharge. At many institutions, weaning of albuterol is part of the discharge process, though presently there is limited evidence to guide best practice. We sought to determine how many children required escalation of care once placed on every 4-h dosing of albuterol.

METHODS

We performed a consecutive case series of pediatric patients between 5 and 18 years of age admitted to a single tertiary care center's pediatric hospitalist service between April 2015 and April 2018 with a discharge diagnosis of asthma. Patients admitted to the intensive care unit (PICU) or a subspecialty service were excluded, as has been done previously. Time between albuterol administrations was tracked. "Treatment escalation" was defined as when a patient required more frequent albuterol more dosing after previously tolerating albuterol doses separated by more than 3.5 h.

RESULTS

A total of 331 patients met inclusion criteria; 136 were female (41.1%), and the average age was 8.8 years. Twenty-six of the 331 patients (7.8%) required escalation of albuterol therapy. Eleven patients returned to the emergency department (ED) following discharge, 2 of which had experienced treatment escalation while admitted.

CONCLUSIONS

Our case series showed that most patients were safe to discharge after spacing albuterol treatments to 4 h, with few returns to the ED and readmissions. Albuterol spacing to every 4 h once appears to be a reasonable discharge criterion, but future studies are needed to determine if this is a safe and efficient.

Exercise rehabilitation in pediatric asthma: A systematic review and network meta-analysis

OBJECTIVE

This systematic review delineates various exercise-based pulmonary rehabilitation (PR) designs and quantifies how they may be optimized in pediatric asthma treatment.

DESIGN

Comprehensive systematic review, network meta-analysis, and quality analyses using PubMed, Embase, Cochrane Library, Web of Science Core Collection, and Medline searches.

INTERVENTIONS

Discrete and combined endurance, respiratory, resistance, strength, and interval training.

MAIN OUTCOME MEASURES

Forced expiratory volume at 1 s to predicted value ratio (FEV₁ % pred), forced vital capacity to predicted value ratio (FVC% pred), forced expiratory flow between 25% and 75% of vital capacity ratio (FEF25%-75%), the Pediatric Asthma Quality of Life Questionnaire (PAQLQ), and the 6-min walk test (6MWT).

RESULTS

Twenty-four randomized controlled trials (RCTs) involving a combined 1031 patients were included. Endurance training was the most common form of PR (58.3%), typically conducted through outpatient clinics (29.2%). Network meta-analysis showed that compared with other PR, interval training significantly improved PAQLQ total scores, and activity, symptom, and emotional domains. Interval training also had a significant effect on the 6MWT. No adverse events were reported. Exercise training did not have a significant effect on FEV₁ % pred; however, combined endurance and respiratory training significantly improved both FVC% pred and FEF25%-75%.

CONCLUSIONS

Exercise-based PR is safe and effective in childhood asthma treatment. Interval training may be a core component for improving quality of life and exercise capacity in this patient population, while combined respiratory and endurance training may significantly affect lung function. The clinical efficacy of these results should be confirmed through high-quality RCTs.

Spring is associated with increased total and allergenic fungal concentrations in house dust from a pediatric asthma cohort in New York City

Introduction

Asthma and allergy symptoms vary seasonally due to exposure to environmental sources of allergen, including fungi. However, we need an improved understanding of seasonal influence on fungal exposures in the indoor environment. We hypothesized that concentrations of total fungi and allergenic species in vacuumed dust vary significantly by season.

Objective

Assess seasonal variation of indoor fungi with greater implications related to seasonal asthma control.

Methods

We combined next-generation sequencing with quantitative polymerase chain reaction (qPCR) to measure concentrations of fungal DNA in indoor floor dust samples (n = 298) collected from homes participating in the New York City Neighborhood Asthma and Allergy Study (NAAS).

Results

Total fungal concentration in spring was significantly higher than the other three seasons (p ≤ 0.005). Mean concentrations for 78% of fungal species were elevated in the spring (26% were significantly highest in spring, p < 0.05). Concentrations of 8 allergenic fungal species were significantly (p < 0.5) higher in spring compared to at least two other seasons. Indoor relative humidity and temperature were significantly highest in spring (p < 0.05) and were associated with total fungal concentration (R2 = 0.049, R2 = 0.11, respectively).

Conclusion

There is significant seasonal variation in total fungal concentration and concentration of select allergenic species. Indoor relative humidity and temperature may underlie these associations.

Development and Utilization of a Diagnostic Support Tool for Asthma within the Electronic Medical Record

Asthma in childhood is a common and costly chronic disease. Quality asthma care can lead to better control of asthma thus decreasing use of health services. The gold standard for pediatric asthma diagnosis and management is the National Heart, Lung and Blood Institute (NHLBI) guidelines for Diagnosis and Management of Asthma which center on precisely establishing the severity of asthma, as this precise classification delineates appropriate therapy. However, navigating these guidelines is a challenge for primary care providers that creates a barrier to providing quality care. We aim to improve precision in asthma severity classification in the community healthcare setting through the development of an electronic asthma decision support tool (eADST) incorporating NHLBI guidelines embedded within the electronic health record system. We developed an algorithm for the eADST to guide the health care provider to the appropriate classification and subsequent therapy. We engaged our health system's electronic health record informatics team and together developed and revised the tool. We launched the tool in three academic community clinics and measured precision in asthma classification in the twelve months prior to the availability of the tool and the twelve months following the launch. We found a significant improvement in precision of asthma severity classification following the launch, a necessary first step in improvement of asthma care. The next step will be to evaluate the impact of the tool on asthma outcomes.

Risk Factors and Outcomes Associated With Antibiotic Therapy in Children Hospitalized With Asthma Exacerbation

OBJECTIVE

Despite lack of benefit, antibiotics are overused in management of asthma exacerbation in children. In this study, data from a single children's hospital were analyzed to identify factors and outcomes associated with antibiotic use in children hospitalized with asthma.

METHODS

The study population was identified by using administrative data from 2012 to 2015, with subsequent verification of asthma. We analyzed factors associated with antibiotic use (demographic, seasonal, clinical) and outcome (length of stay [LOS]) with respect to: 1) disposition to pediatric floor (PF) or pediatric intensive care unit (PICU); and 2) evidence of coexisting bacterial infection and/or fever. Statistical analysis included univariate and controlled regression models. Data are presented as median and IQR for continuous variables and OR and regression coefficient (β) with 95% CIs for regression analyses.

RESULTS

Of 600 patients, 28.8% were admitted to PICU, 14.8% had verified bacterial infection, and 53.8% received antibiotic, mainly azithromycin. Nearly all PICU patients were treated with antibiotic, irrespective of coexisting bacterial infection or fever. Among PF patients, nearly 30% without bacterial infection or fever and 40% with fever alone received antimicrobials. Overall risk for antibiotic treatment was associated with older age, female sex, desaturation events, oxygen supplementation, and PICU admission. Additionally, antibiotic treatment was associated with 13- to 19-hour increased LOS for PF patients without bacterial infection and/or fever.

CONCLUSIONS

Almost half of pediatric patients admitted with asthma exacerbation received antibiotic therapy with no clear indication, which was associated with prolonged LOS.

Heliox Prescribing Trends for Pediatric Critical Asthma

BACKGROUND

Children with asthma exacerbations requiring pediatric ICU (PICU) admission, known as critical asthma (CA), are prescribed a variety of therapeutic interventions including heliox. Delivered invasively and noninvasively, heliox is employed to enhance deposition of aerosolized medications, improve obstructive pulmonary pathophysiology, and avoid complications associated with invasive mechanical ventilation. We used the Virtual Pediatric Systems database to update estimates of heliox prescription and explore for relationships between heliox and mechanical ventilation frequency and duration.

METHODS

We performed a retrospective cohort study using data from 97 PICUs among children 3-17 y of age admitted for CA from 2013-2019. The primary outcome was heliox prescribing rates and trends. Subgroup analyses assessed mechanical ventilation rates and duration by heliox exposure.

RESULTS

Of 43,238 subjects studied, 1,070 (2.5%) were prescribed heliox. Mean heliox prescribing rates fell from 4.11% in 2013 to 2.37% in 2019. Heliox use was greater from centers in the South (2.6%) and Midwest (3.3%) as compared to the West (1.6%) and Northeast United States (1.6%, P < .001). In the subgroup assessing mechanical ventilation frequency, mechanical ventilation rates were 273/39,739 (0.7%) and greater for those provided heliox (1.9% vs 0.7%, P < .001). In the subgroup assessing mechanical ventilation duration, no differences in median mechanical ventilation duration were observed (4.94 [interquartile range [IQR] 3.04-6.36] vs 4.63 [IQR 3.11-7.30] d; P = .35) for those with and without heliox. In exploratory adjusted models, noninvasive heliox was not associated with mechanical ventilation. Mortality was rare (206/43,238 [0.47%]) and predominantly among subjects intubated prehospitalization (188/206 [91.3%]).

CONCLUSIONS

Heliox as adjunctive therapy for children with CA is uncommon (2.5%) and not associated with mechanical ventilation or decreased mechanical ventilation duration in adjusted models. Updated estimates provided herein inform prospective controlled trial development to better define the role of heliox for CA.

Reduced rate of postpartum readmissions among homeless compared with non-homeless women in New York: a population-based study using serial, cross-sectional data

Objective

To assess differences in rates of postpartum hospitalisations among homeless women compared with non-homeless women.

Design

Cross-sectional secondary analysis of readmissions and emergency department (ED) utilisation among postpartum women using hierarchical regression models adjusted for age, race/ethnicity, insurance type during delivery, delivery length of stay, maternal comorbidity index score, other pregnancy complications, neonatal complications, caesarean delivery, year fixed effect and a birth hospital random effect.

Setting

New York statewide inpatient and emergency department databases (2009–2014).

Participants

82 820 and 1 026 965 postpartum homeless and non-homeless women, respectively.

Main outcome measures

Postpartum readmissions (primary outcome) and postpartum ED visits (secondary outcome) within 6 weeks after discharge date from delivery hospitalisation.

Results

Homeless women had lower rates of both postpartum readmissions (risk-adjusted rates: 1.4% vs 1.6%; adjusted OR (aOR) 0.87, 95% CI 0.75 to 1.00, p=0.048) and ED visits than non-homeless women (risk-adjusted rates: 8.1% vs 9.5%; aOR 0.83, 95% CI 0.77 to 0.90, p<0.001). A sensitivity analysis stratifying the non-homeless population by income quartile revealed significantly lower hospitalisation rates of homeless women compared with housed women in the lowest income quartile. These results were surprising due to the trend of postpartum hospitalisation rates increasing as income levels decreased.

Conclusions

Two factors likely led to lower rates of hospital readmissions among homeless women. First, barriers including lack of transportation, payment or childcare could have impeded access to postpartum inpatient and emergency care. Second, given New York State’s extensive safety net, discharge planning such as respite and sober living housing may have provided access to outpatient care and quality of life, preventing adverse health events. Additional research using outpatient data and patient perspectives is needed to recognise how the factors affect postpartum health among homeless women. These findings could aid in lowering readmissions of the housed postpartum population.

Use of the pleth variability index in children with obstructive respiratory disease

INTRODUCTION

The phenomenon of pulsus paradoxus (PP) develops at varying rates in relation to the severity of the disease in obstructive respiratory tract disease. The Pleth Variability Index (PVI) is the measurement value of perfusion index changes that occur with ventilation, which are determined during at least one respiratory cycle. Therefore, noninvasive measurement of PVI can help in the measurement of PP. The current study aims to determine the role of PVI measurements before and after bronchodilator therapy during admission to the hospital in children with obstructive respiratory tract disease.

METHODS

Age, gender, Pulmonary Index Score (PIS), and PVI data of patients aged 2-18 years who applied to the pediatric emergency department with signs of obstructive respiratory tract disease were recorded in triage. The PVI and PIS scores of the patients, who were divided into three groups according to their clinical severity scores, were recorded before and after bronchodilator treatment, and they were compared to the PVI values according to the disposition results.

RESULTS

A total of 133 patients were included in this prospective, single-center study. The PVI values before and after treatment were significantly higher in patients with severe disease compared to the mild and moderate groups (p < 0.001). Post-treatment PVI values were significantly lower than pre-treatment values in all clinical severity groups (p < 0.001). While a total of 95 (71.43%) patients were discharged from the emergency department, 31 (23.31%) patients were admitted to the relevant department, and seven (5.26%) patients were admitted to the pediatric intensive care unit. The PVI values before and after treatment were significantly higher in the hospitalized group compared to the group discharged from the emergency department (p < 0.001). The areas under the ROCs were 0.940, 0.865, and 0.843 for the PVI measurements in patients with severe disease, moderate disease, and hospitalization (p< 0.001).

CONCLUSIONS

Automated PVI measurement can be used as a noninvasive, rapid, and objective tool in the emergency department triage of patients admitted to the pediatric emergency department with signs of asthma attack or reactive respiratory tract disease.

Decline in hospitalization for childhood asthma in different air pollution regions in Taiwan, 2001-2012

This study aimed to investigate the trends in childhood asthma hospitalization in regions with differing levels of air pollution in Taiwan, 2001-2012. Joinpoint regression was used to identify significant trend changes. The hospitalization rate varied according to gender, geographic region, and age. The incidence of childhood asthma hospitalization decreased from 127.99 to 76.67 (/100,000 population), with an average annual percentage change of around -4.1%; in the Yilan region, the average air pollution concentrations were 19.92 μg/m³, 39.47 μg/m³, 25.99 ppb, 2.19 ppb, and 11.23 ppb for PM_2.5, PM₁₀, O₃, SO₂, and NO₂, respectively, which were lower than Taiwan's average values; however, the childhood asthma hospitalization rate was the highest (179.75/100,000 population). The national trend in childhood asthma hospitalization exhibited a significant decrease. The effects of air pollution on childhood asthma were greater in the higher-level air pollution regions, while less association was observed in the lower-level air pollution regions.

Update on Long-Acting Anticholinergics in Children and Adolescents With Difficult and Severe Asthma

Tiotropium bromide is the only long-acting muscarinic antagonist (LAMA) approved for treatment of patients aged ≥6 years old who have symptoms of uncontrolled asthma. Results from several clinical trials have found that once-daily inhaled tiotropium bromide is safe and efficacious in 6- to 17-year-olds with symptomatic asthma despite treatment with inhaled corticosteroids, with or without other medications. There are still few available studies investigating the impact of tiotropium bromide treatment in preschool children with suboptimal control. In this narrative review, we summarize the pharmacological effects of the LAMA tiotropium bromide, provide an overview about current asthma studies at different pediatric ages, and describe future research needs.

Association between early childhood lower respiratory tract infections and subsequent asthma

OBJECTIVE

We examined the relationship between recurrent lower respiratory tract infections (LRTI) in young children and subsequent childhood asthma outcomes.

METHODS

Retrospective cohort study using 2009-2017 Colorado All Payer Claims Database to assess 0- to 2-year-old children with visits due to LRTI and acute gastroenteritis (AGE). The primary exposure was number of LRTI visits prior to 2 years of age. Children with AGE served as the no LRTI comparator group. The primary outcome was incident asthma, defined by ICD-9 (490.XX) or ICD-10 (J45.9XX) codes, in the same children between 3 and 9 years of age. Multivariable accelerated failure time (AFT) models were used to estimate the effect of LRTI visits on median time to asthma diagnosis. Sensitivity analyses were performed using more conservative asthma diagnostic criteria and with hospitalized children only.

RESULTS

Of 38,441 eligible subjects, 32,729 had ≥1 LRTI and 5,712 had AGE (no LRTI) between 0 and 2 years of age. Children with ≥3 LRTI visits had an 80% decrease in median time to asthma diagnosis relative to those with AGE visits only (time ratio [TR] 0.2; 95% CI 0.16, 0.24). Children with ≥3 LRTI hospitalizations had a 98% reduction in median time to asthma diagnosis relative to those with AGE hospitalizations only (TR 0.02; 95% CI 0.01, 0.07). History of atopy, wheezing, and family history of asthma documented prior to 2 years of age were also associated with earlier asthma diagnosis.

CONCLUSIONS

Recurrent LRTIs, especially LRTI hospitalizations, before 2 years of age are associated with earlier diagnosis of pediatric asthma.

Implementation of a Nurse-Driven Asthma Pathway in the Pediatric Intensive Care Unit

Asthma is one of the most common conditions requiring admission to a pediatric intensive care unit. Dosing and weaning medications, particularly bronchodilators, are highly variable, and evidence-based weaning algorithms for clinicians are lacking in this setting.

METHODS

Patients admitted to a quaternary pediatric intensive care unit diagnosed with acute severe asthma were evaluated for time spent receiving continuous albuterol therapy, the length of stay in the intensive unit care unit, and the length of stay in the hospital. We developed an asthma pathway and continuous bronchodilator weaning algorithm to be used by bedside nurses. We then implemented two major Plan-Do-Study-Act cycles to facilitate the use of the pathway. They included implementing the algorithm and then integrating it as a clinical decision support tool in the electronic medical record. We used standard statistics and quality improvement methodology to analyze results.

RESULTS

One-hundred twenty-six patients met inclusion criteria during the study period, with 32 during baseline collection, 60 after weaning algorithm development and implementation, and 34 after clinical decision support implementation. Using quality improvement methodology, hours spent receiving continuous albuterol decreased from a mean of 43.6 to 28.6 hours after clinical decision support development. There were no differences in length of stay using standard statistics and QI methodology.

CONCLUSION

Protocolized asthma management in the intensive care unit setting utilizing a multidisciplinary approach and clinical decision support tools for bedside nursing can reduce time spent receiving continuous albuterol and may lead to improved patient outcomes.

Regional differences in pediatric asthma hospital admissions: National data from Israel 1996-2017

BACKGROUND

Asthma is a common chronic childhood illness and frequent cause of hospitalization. A decline in hospital admission rates was noted up to the 1990s, however, trends are not as clear since the turn of the century. This study aimed to assess the rates and regional differences of asthma admissions over more than two decades using the national Ministry of Health database, which registers data from all the hospitals.

METHODS

A retrospective cohort study, analysis of all pediatric asthma admissions, for Patients 1-14 years old, between 1996 and 2017 as recorded by the National Hospital Discharge Registry, was performed. Asthma admission rates were calculated per 1000 age adjusted residents, using the number of admission cases as the numerator, and age specific population size as the denominator.

RESULTS

The annual asthma hospitalization rate decreased in the entire pediatric population from 2.14 in 1996-0.89 in 2017. Children in the 1-4 year age group comprised most of the hospital admissions, and most of the decline was attributable to this age group. Significant differences in hospitalizations were found between different regions as well as differences in the rate of decline in asthma hospitalizations with the lowest admission rate in the Jerusalem district, highest in Haifa, northern and southern Israeli regions and the greatest rate of decline in the Tel-Aviv district.

CONCLUSION

This nationwide study, over more than two decades, shows clear regional differences in the rates of asthma admissions as well as regional differences in the rates of decline.

Impact of obstructive sleep apnea on assisted ventilation in children with asthma exacerbation

OBJECTIVE

To determine the impact of obstructive sleep apnea (OSA) on asthma exacerbation severity in children hospitalized for asthma exacerbation.

HYPOTHESIS

OSA is associated with greater use of invasive mechanical ventilation (IMV) and noninvasive mechanical ventilation (NIMV) in children hospitalized for asthma exacerbation.

STUDY DESIGN

A retrospective cohort study.

PATIENT-SUBJECT SELECTION

Hospitalization records of children aged 2-18 years admitted for acute asthma exacerbation were obtained for 2000, 2003, 2006, 2009, and 2012 from the Kids' Inpatient Database.

METHODOLOGY

The primary exposure was OSA, the primary outcome was IMV, and secondary outcomes were NIMV, length of hospital stay (LOS), and inflation-adjusted cost of hospitalization. Multivariable logistic regression, negative binomial, and linear regression were conducted to ascertain the impact of OSA on primary and secondary outcomes. Exploratory analyses investigated the impact of obesity on primary and secondary outcomes.

RESULTS

Among 564,467 hospitalizations for acute asthma exacerbation, 4209 (0.75%) had OSA. Multivariable regression indicated that OSA was associated with IMV (adjusted odds ratio [OR], 5.33 [95% confidence interval, CI: 4.35-6.54], p < .0001), NIMV (adjusted OR, 8.30 [95% CI: 6.56-10.51], p < .0001), longer LOS (adjusted incidence rate ratio, 1.34 [95% CI 1.28-1.43], p < .0001), and greater inflation-adjusted cost of hospitalization (adjusted β, 0.38 [95% CI: 0.33-0.43], p < .0001). Obesity was also significantly associated IMV, NIMV, longer LOS, and greater inflation-adjusted cost of hospitalization. There was no interaction between OSA and obesity.

CONCLUSION

OSA is an independent risk factor for IMV, NIMV, longer LOS, and elevated inflation-adjusted costs of hospitalization in children hospitalized for asthma exacerbation.

Health Care Utilization Due to Substance Abuse Among Homeless and Nonhomeless Children and Young Adults in New York

OBJECTIVE

Substance abuse, particularly among homeless youths, is a significant public health challenge in the United States. Detailed data about health care utilization resulting from this preventable behavior remain sparse. This study aimed to compare health care utilization rates related to substance abuse among homeless and nonhomeless youths.

METHODS

A secondary data analysis evaluated records of homeless and nonhomeless patients under age 25 with a primary diagnosis of substance abuse, identified in 2013 and 2014 New York Statewide Inpatient and Emergency Department (ED) Databases. Outcomes included ED visit rate, hospitalization rate, in-hospital mortality, cost, length of stay (LOS), intensive care unit (ICU) utilization, and revisit or readmission rate. Multivariable regression models with a year fixed effect and facility random effect were used to evaluate the association between homelessness and each outcome.

RESULTS

A total of 68,867 cases included hospitalization or an ED visit related to substance abuse (68,118 nonhomeless and 749 homeless cases). Rates of ED visits related to substance abuse were 9.38 and 4.96, while rates of hospitalizations related to substance abuse were 10.53 and 1.01 per 1,000 homeless and nonhomeless youths, respectively. Homeless patients were more likely to utilize and revisit the ICU, be hospitalized or readmitted, incur higher costs, and have longer LOS than nonhomeless youths (all p<0.01).

CONCLUSIONS

The hospitalization and ED visit rates related to substance abuse were 10 and two times higher among homeless youths compared with nonhomeless youths, respectively. Detailed observation is needed to clarify whether homeless youths receive high-quality care for substance abuse when necessary.

Inpatient Pediatric CKD Health Care Utilization and Mortality in the United States

RATIONALE & OBJECTIVE

The impact of chronic kidney disease (CKD) on inpatient health care use is unknown. This study aimed to describe the prevalence of pediatric CKD among children hospitalized in the United States and examine the association of CKD with hospital outcomes.

STUDY DESIGN

Cross-sectional national survey of pediatric discharges.

SETTING & PARTICIPANTS

Hospital discharges of children (aged>28 days to 19 years) with a chronic medical diagnosis included in the Healthcare Cost and Utilization Project Kids' Inpatient Database for 2006, 2009, 2012, and 2016.

PREDICTOR

Presence of primary or coexisting CKD as identified by diagnosis codes.

OUTCOMES

Length of stay (LOS), cost, and mortality.

ANALYTICAL APPROACH

Multivariable analysis using Poisson, gamma, and logistic regressions were performed for LOS, cost, and mortality, respectively.

RESULTS

A chronic medical condition was present in 6,524,745 estimated discharges during the study period and CKD was present among 3.9% of discharges (96.1% without CKD). Those with CKD had a longer LOS (median of 2.8 [IQR, 1.4-6.0] days compared with 1.8 [IQR, 1.0-4.4] days for those without a CKD diagnosis; P<0.001). Median cost was higher in the CKD group compared with the group without CKD, at $8,755 (IQR, $4,563-18,345) and $5,016 (IQR, $2,860-10,109) per hospitalization, respectively (P<0.001). Presence of CKD was associated with a longer LOS (29.9% [95% CI, 27.2%-32.6%] longer than those without CKD), higher cost (61.3% [95% CI, 57.4%-65.4%] greater than those without CKD), and higher risk for mortality (OR, 1.51 [95% CI, 1.40-1.63]).

LIMITATIONS

Lack of access to and adjustment for confounders including patient readmission and laboratory data.

CONCLUSIONS

Pediatric CKD was associated with longer LOS, higher costs, and higher risk for mortality compared with hospitalizations with other chronic illnesses. Further studies are needed to better understand the health care needs and delivery of care to hospitalized children with CKD.

Obesity and Corticosteroid Dosing Guideline Adherence in Children Hospitalized With Asthma

OBJECTIVES

Drug dosing recommendations for children with obesity remain limited. This may lead to variability in medication dosing among children with obesity. Therefore, our objective was to determine differences in the prevalence of guideline-nonadherent systemic corticosteroid orders by weight category in children hospitalized for asthma.

METHODS

We performed a retrospective cross-sectional study of children aged 2 to 17 years hospitalized with asthma and prescribed systemic corticosteroids between January 1, 2010, and December 31, 2017, using the Cerner Health Facts deidentified database. Weight categories ranging from underweight to class III obesity were defined on the basis of BMI percentiles by using CDC guidelines. Corticosteroid orders were categorized as guideline adherent or nonadherent on the basis of total body weight-based dosing guidelines from the National Heart, Lung, and Blood Institute. χ² test and multivariable logistic regression models were used to determine differences in guideline adherence between weight categories.

RESULTS

We identified 21 488 children prescribed systemic corticosteroids during asthma hospitalizations. Most (54.2%) had a healthy weight, and 23.8% had obesity. Almost one-quarter received guideline-nonadherent orders (22.2%), with increasing prevalence among higher weight categories (19.4% of healthy weight children versus 36.0% of those with class III obesity; P < .001). After controlling for demographic and clinical covariates, weight category remained significantly associated with receiving a guideline-nonadherent order (P < .001).

CONCLUSIONS

The prevalence of guideline-nonadherent corticosteroid orders for children hospitalized with asthma increases linearly with weight category, disproportionately affecting children with severe obesity. Standardization of drug dosing guidelines for children with obesity may help reduce variability in drug doses prescribed that may increase risk of harm.

Use of the composite asthma severity index in a pediatric subspecialty clinic

BACKGROUND

The Composite Asthma Severity Index (CASI) is a comprehensive tool to assess asthma severity, which has been applied in the research setting.

OBJECTIVE

To evaluate, in an outpatient setting, whether a CASI score accurately predicts asthma severity or control as determined by means of subspecialist assessment. Asthma Control Test (ACT) and childhood ACT (C-ACT) scores were generated to provide additional context for CASI scores in relationship to assessments using another clinical tool.

METHODS

Children aged 5 to 18 years with a physician diagnosis of persistent asthma were recruited from a tertiary care center. A pediatric pulmonologist made determinations on each participant's asthma severity and control during a clinic visit. A CASI and ACT/C-ACT score was generated for each patient. Logistic regression and Spearman correlations were used to determine how well CASI scores predicted physician assessments. Agreement between ACT/C-ACT scores and physician assessment of asthma control was determined in supplemental analyses.

RESULTS

CASI scores strongly predicted physician assessment of severity (Spearman correlation = 0.61, P < .001); unadjusted odds ratio (OR) equal to 36.67 (95% confidence interval [CI]: 8.83-152.34); and adjusted OR equal to 32.76 (95% CI: 85.70-188.44). In supplemental analyses, ACT/C-ACT scores strongly predicted physician assessment of control (Spearman correlation = 0.72, P < .001) with an unadjusted OR equal to 42.12 (95% CI: 13.34-133.00) and adjusted OR equal to 55.34 (95% CI: 13.62-224.89).

CONCLUSION

Use of the CASI was feasible and accurately predicted physician assessments of asthma severity and control in this sample, which are not distinct entities. The CASI is a robust tool that may be used successfully in ambulatory pediatric asthma care.

Variability in care for children with severe acute asthma in Latin America

BACKGROUND

Care variability for children with severe acute asthma has been well documented in high-income countries, yet data from low- and middle-income regions are lacking. We sought to characterize the magnitude of practice variability in the care of Latin American children to identify opportunities for standardization of care.

METHODS

A cross-sectional study performed through a retrospective analysis of contemporaneously collected data of children with severe acute asthma admitted to a center contributing to the LARed Network registry between May 2017 and May 2019. Centers were grouped by geographic location: Atlantic (AT), South Pacific (SP), and North Central (NC).

RESULTS

Among 434 children, most received care in hospitals in the AT group (54% [235/434]), followed by the NC (23% [101/434]) and SP (23% [98/434]) groups. The majority of children in the AT (92% [215/235]) and SP (91% [89/98]) groups received nebulized salbutamol/albuterol, while metered-dose inhalers were preferred in the NC group (72% [73/101]). There was a wide variation in the use of antibiotics: AT (57% [135/235]), SP (48% [47/98]), and NC (14% [14/101]). The same was true for ipratropium bromide: AT (67% [157/235]), SP (90% [88/98]), and NC (17% [17/101]), and aminophylline: AT (57% [135/235]), NC (5% [5/101]), and SP (0% [0/98]). High-flow nasal cannula was the preferred respiratory support modality in the AT (60% [141/235]) and NC (40% [40/101]) groups, while bilevel positive airway pressure (BiPAP) use was more common in the SP group (80% [78/98]).

CONCLUSION

We identified significant variability in care for severe acute asthma. Our findings will help to inform the design of future studies, quality improvement initiatives, and development of practice guidelines within Latin America.

Randomized pilot trial of ipratropium versus placebo in children with critical asthma

OBJECTIVE

To test the effects of inhaled ipratropium on clinical outcomes of critical asthma in the first randomized trial of this adjunctive therapy in critically ill children.

DESIGN

Pilot, placebo-controlled, double-blinded, and randomized-controlled trial PATIENTS: Thirty children (15 per group) with critical asthma receiving high-intensity albuterol per a standardized pathway utilizing objective assessments to wean patients to less frequent albuterol administration.

INTERVENTIONS

Subjects were randomized to receive either nebulized ipratropium bromide (500 µg in 0.9% saline per dose) or an equivalent volume of nebulized 0.9% saline every 6 h until the patient was successfully weaned to albuterol doses every 2 h ("q2 albuterol").

MEASUREMENTS AND MAIN RESULTS

Demographics, initial clinical severity score, and asthma histories were similar between groups. There was no significant difference in the median duration of high-intensity albuterol between the treatment group (17.5 [10.3-22.1] h) and placebo group (14.6 [12.7-24.5] days; p = .56). Similarly, there was no significant difference in pediatric intensive care unit length of stay (22.6 [21.1-33.6] vs. 21.4 [16.1-35.8] h; p = .74) or hospital length of stay (48.0 [41.8-59.8] vs. 47.3 [37.2-63.1] h; p = .67). In multivariate linear regression adjusting for identified confounders, treatment with ipratropium was not significantly associated with any of the three outcomes. Side effects were rare and occurred with equally between both groups CONCLUSIONS: Adjunctive therapy with ipratropium was not associated with decreased duration of high-intensity albuterol or shortened length of stay when compared to placebo. A larger, multicenter trial is warranted to confirm that ipratropium does not improve clinical outcomes.

Trends in the Use of Noninvasive and Invasive Ventilation for Severe Asthma

OBJECTIVES

To explore and define contemporary trends in the use of invasive mechanical ventilation (IMV) and noninvasive ventilation (NIV) in the treatment of children with asthma.

METHODS

We performed a serial cross-sectional analysis using data from the Pediatric Health Information System. We examined 2014-2018 admission abstracts from patients aged 2 to 17 years who were admitted to member hospitals with a primary diagnosis of asthma. We report temporal trends in IMV use, NIV use, ICU admission, length of stay, and mortality.

RESULTS

Over the study period, 48 hospitals reported 95 204 admissions with a primary diagnosis of asthma. Overall, IMV use remained stable at 0.6% between 2014 and 2018 (interquartile range [IQR]: 0.3%-1.1% and 0.2%-1.3%, respectively), whereas NIV use increased from 1.5% (IQR: 0.3%-3.2%) to 2.1% (IQR: 0.3%-5.6%). There was considerable practice variation among centers, with NIV rates more than doubling within the highest quartile of users (from 4.8% [IQR: 2.8%-7.5%] to 13.2% [IQR: 7.4%-15.2%]; P < .02). ICU admission was more common among centers with high NIV use, but centers with high NIV use did not differ from lower-use centers in mortality, IMV use, or overall average length of stay.

CONCLUSIONS

The use of IMV is at historic lows, and NIV has replaced it as the primary mechanical support mode for asthma. However, there is considerable variability in NIV use. Increased NIV use was not associated with a change in IMV rates, which remained stable. Higher NIV use was associated with increased ICU admissions. NIV's precise contribution to the cost and quality of care remains to be determined.

A Bayesian spatio-temporal analysis of neighborhood pediatric asthma emergency department visit disparities

Asthma disparities have complex, neighborhood-level drivers that are not well understood. Consequently, identifying particular contextual factors that contribute to disparities is a public health goal. We study pediatric asthma emergency department (ED) visit disparities and neighborhood factors associated with them in South Carolina (SC) census tracts from 1999 to 2015. Leveraging a Bayesian framework, we identify risk clusters, spatially-varying relationships, and risk percentile-specific associations. Clusters of high risk occur in both rural and urban census tracts with high probability, with neighborhood-specific associations suggesting unique risk factors for each locale. Bayesian methods can help clarify the neighborhood drivers of health disparities.

Pediatric asthma pathway in the emergency room

Asthma is one of the leading causes of hospital admission in the pediatric population. Standardization of asthma management guidelines for patients admitted to the emergency department has been suggested to improve care delivery and patient outcomes. Utilizing a multidisciplinary asthma task force at a single academic medical center, we sought to determine if a protocol-driven approach to implementation of care for patients with asthma could improve patient outcomes by reducing wait times for administration of steroids. A prospective cohort study examined the use of a standardized asthma pathway over a 2-year period compared to historical controls. Pathway use significantly decreased time to corticosteroid administration (45 vs. 29 min [year 1] and 20 min [year 2]; P < 0.0001). By implementing this standard of care at pediatric emergency departments, time to treatment can be decreased, therefore improving the morbidity and mortality of pediatric patients with asthma nationwide.

The economic burden of medical treatment of children with asthma in China

Background

At present, there are few studies on the economic burden and medical treatment of children with asthma in China. Thus this study aimed to investigate the economic burden of medical treatment of children with asthma in China.

Method

The 2015 China Medical Insurance Research Association (CHIRA) database was searched for patients with asthma from 0 to 14 years old. A cross-sectional study with cost analysis was conducted.

Results

The annual per capita direct medical cost was RMB 525 (US$75) related to asthma. Totaling 58% of the medical expenditure for asthma was covered by insurance in China, the majority of which were direct medical costs. Those that have the highest rates of using antibiotics were central China (100.0%), children aged 3 years and under (63.6%), as well as fourth-tier and fifth-tier cities (77.1%). Outpatient clinics (98.58% vs 1.42%, P < 0.01), tertiary hospitals (62.08% vs 37.92%, P < 0.01), and general hospitals (72.27% vs 27.73%, P < 0.01) were more often visited than the inpatient clinics, secondary and primary as well as the specialized clinics, respectively.

Conclusion

The economic burden of childhood asthma in China is relatively low, and the national medical insurance reduces their economic burden to a large extent. Abuse of antibiotics in treating asthma was found in China. There remain opportunities to strengthen the hierarchical medical system, reducing hospitalization and emergency visits, and ultimately reducing the economic burden of children with asthma.

Association of various weight-based doses of continuous albuterol on hospital length of stay

Introduction: Continuous albuterol is a mainstay in management of pediatric status asthmaticus. While the National Heart Lung and Blood Institute Asthma Guidelines suggest 0.5 mg/kg/h as the recommended dosage, there is a paucity of evidence comparing different weight-based rates on hospital outcomes.Methods: Patients requiring continuous albuterol for asthma exacerbation from January 2015 to December 2016 were identified using ICD codes. The concentration of albuterol (5 mg/h-20 mg/h) and the duration of treatment were used to determine total albuterol administration. After dividing by patient weight, average weight-based doses were divided into equal quintiles. Unadjusted and length of stay adjusted for age, initial asthma severity score, and administration of magnesium were compared among the quintiles. The same multivariate analysis was used for duration of continuous albuterol.Results: Five hundred thirty-three hospitalizations for asthma were identified of which 289 received continuous albuterol. Weight-based dosage quintiles ranged from lowest (0.07-0.29 mg/kg/h) to the highest (>0.76-3.2 mg/kg/h). Baseline characteristics were similar aside from age, race, and magnesium administration. There was no difference in adjusted length of stay or adjusted duration of continuous albuterol therapy among the five quintiles.Conclusion: No optimal weight-based dose of continuous albuterol was found. Further investigation is needed to see if lower amounts of continuous albuterol may be as efficacious as higher doses. This could improve cost of status asthmaticus management and limit the number of adverse events associated with high exposure to continuous albuterol.

Mechanisms of Dupilumab

The Th2 cytokines interleukin 4 (IL-4) and IL-13 and the heterodimeric IL-4 receptor (IL-4R) complexes that they interact with play a key role in the pathogenesis of allergic disorders. Dupilumab is a humanized IgG4 monoclonal antibody that targets the IL-4 receptor alpha chain (IL-4Rα), common to both IL-4R complexes: type 1 (IL-4Rα/γc; IL-4 specific) and type 2 (IL-4Rα/IL-13Rα1; IL-4 and IL-13 specific). In this review, we detail the current state of knowledge of the different signalling pathways coupled to the IL-4R complexes and examine the possible mechanisms of Dupilumab action and survey its clinical efficacy in different allergic disorders. The development of Dupilumab and the widening spectrum of its clinical applications is relevant to the current emphasis on precision medicine approaches to the blockade of pathways involved in allergic diseases.

Differences in Outcomes Based on Sex for Pediatric Patients Undergoing Pyloromyotomy

BACKGROUND

Males and females are known to have varied responses to medical interventions. Our study aimed to determine the effect of sex on surgical outcomes after pyloromyotomy.

MATERIALS AND METHODS

Using the Kids' Inpatient Database for the years 2003-2012, we performed a serial, cross-sectional analysis of a nationally representative sample of all patients aged <1 y who underwent pyloromyotomy for hypertrophic pyloric stenosis. The primary predictor of interest was sex. Outcomes included mortality, in-hospital complications, cost, and length of stay. Regression models were adjusted by race, age group, comorbidity, complications, and whether operation was performed on the day of admission with region and year fixed effects.

RESULTS

Of 48,834 weighted operations, 81.8% were in males and 18.2% were in females. The most common reported race was white (47.3%) and most of the patients were ≥29 days old (72.5%). There was no difference in the odds of postoperative complications, but females had a significantly longer length of stay (incidence rate ratio, 1.28; 95% confidence interval [95% CI], 1.18-1.39; P ≤ 0.01), higher cost (5%, 95% CI, 1.02-1.08; P ≤ 0.01), and higher odds of mortality (odds ratio, 3.26; 95% CI, 1.52-6.98; P ≤ 0.01).

CONCLUSIONS

Our study demonstrated that females had worse outcomes after pyloromyotomy compared with males. These findings are striking and are important to consider when treating either sex to help set physician and family expectations perioperatively. Further studies are needed to determine why such differences exist and to develop targeted treatment strategies for both females and males with pyloric stenosis.

Weighing in on asthma: Insights on BMI, magnesium, and hospitalizations from the Ohio Pediatric Asthma Repository

Objective: Little is known about weight status and its effects on clinical course during hospitalization for asthma exacerbation. We sought to evaluate associations between weight status, specifically body mass index (BMI), with inpatient clinical course and clinical history.Methods: We retrospectively analyzed data from 2012 to 2013 on children hospitalized for asthma exacerbation in a state-wide longitudinal cohort, the Ohio Pediatric Asthma Repository. We examined BMI continuously (z scores) and categorically, comparing overweight and obese (Ov/Ob) to non-overweight and non-obese (nOv/nOb) children. We used linear mixed models controlling for site effects to determine if BMI was related to length of stay, as determined by physiologic readiness for discharge (PRD), defined as time to albuterol spaced every 4 h, need for nonstandard care or clinical history.Results: Across six hospitals, 874 children were included in analyses. BMI was positively associated with PRD (p=.008) but this increase was unlikely to be clinically significant. Ov/Ob children were more likely than nOv/nOb to require nonstandard care with repeat magnesium dosing in intensive care after dosing in the emergency department (OR = 3.23, 95%CI 1.39-7.78). Hospitalization in the year prior to enrollment was positively associated with BMI percentile (73.3 vs. 66.0, p=.028). Sleep disordered breathing was also associated with higher BMI percentile (78.2 vs. 65.9; p=.0013).Conclusions: Ov/Ob children had similar PRD to nOv/nOb children and were prone to repeat magnesium dosing. Previous hospitalization for exacerbation was positively associated with increasing BMI percentile. Additional research should investigate differential magnesium use by weight status, quantifying risks and benefits.

Asthma Hospitalizations Among Homeless Children in New York State

BACKGROUND AND OBJECTIVES

Asthma is widely prevalent among US children, particularly in homeless children, who often lack proper medication storage or the ability to avoid environmental triggers. In this study, we assess asthma-attributed health care use among homeless youth. We hypothesize that asthma hospitalization rates, symptom severity, and admission through the emergency department (ED) will be higher among homeless youth compared with nonhomeless youth.

METHODS

This secondary data analysis identified homeless and nonhomeless pediatric patients (<18 years old) with a primary diagnosis of asthma from New York statewide inpatient databases between 2009 and 2014. Hospitalization rate, readmission rate, admission through the ED, ventilation use, ICU admittance, hospitalization cost, and length of stay were measured.

RESULTS

We identified 71 837 asthma hospitalizations, yielding 73.8 and 2.3 hospitalizations per 1000 homeless and nonhomeless children, respectively. Hospitalization rates varied by nonhomeless income quartile, with low-income children experiencing higher rates (5.4) of hospitalization. Readmissions accounted for 16.0% of homeless and 12.5% of nonhomeless hospitalizations. Compared with nonhomeless patients, homeless patients were more likely to be admitted from the ED (odds ratio 1.96; 95% confidence interval: 1.82-2.12; P < .01), and among patients >5 years old, homeless patients were more likely to receive ventilation (odds ratio 1.45; 95% confidence interval: 1.01-2.09; P = .04). No significant differences were observed in ICU admittance, cost, or length of stay.

CONCLUSIONS

Homeless youth experience an asthma hospitalization rate 31 times higher than nonhomeless youth, with higher rates of readmission. Homeless youth live under uniquely challenging circumstances. Tailored asthma control strategies and educational intervention could greatly reduce hospitalizations.

High Healthcare Resource Use in Hospitalized Patients with a Diagnosis of Spinal Muscular Atrophy Type 1 (SMA1): Retrospective Analysis of the Kids' Inpatient Database (KID)

BACKGROUND

Patients with spinal muscular atrophy (SMA) have high healthcare resource use (HRU) due to respiratory and nutritional complications resulting from progressive muscle atrophy. While previous studies estimate the direct costs to be US$113,000 to US$121,682 per year in the US, they potentially understate costs for type 1 SMA (SMA1). This study analyzed HRU in hospitalizations with a diagnosis of SMA1 and compared it with hospitalizations with complex chronic conditions (CCC) other than SMA1 or those with no CCC.

METHODS

This retrospective analysis of a defined subset of the 2012 Kids' Inpatient Database (KID) compared a nationally estimated number of hospitalizations of children (aged < 3 years) categorized into three groups: (1) SMA1 (n = 237 admissions), (2) no CCC (n = 632,467 admissions), and (3) other CCC (n = 224,953 admissions).

RESULTS

Mean total charges were higher for SMA1 admissions compared with admissions with no CCC (US$150,921 vs US$19,261 per admission, respectively; costs: US$50,190 vs $5862 per admission, respectively; both p < 0.0001). A larger proportion of SMA1 admissions were billed for one or more procedure codes (81.9%) than in the no CCC group (39.4%) or other CCC group (70.1%; both p ≤ 0.0003). SMA1 admissions had a longer length of stay compared with admissions with no CCC (15.1 vs 3.4, respectively; p < 0.0001).

CONCLUSIONS

The average total charges for a single SMA1 admission were higher than those of the no CCC group. Because most infants with SMA1 require multiple hospitalizations per year, previous estimates may dramatically underestimate the direct costs associated with HRU. Further studies are required to determine the indirect costs and societal impacts of SMA1.

What Are the Primary Cost Drivers of Anterior Cruciate Ligament Reconstruction in the United States? A Cost-Minimization Analysis of 14,713 Patients

PURPOSE

To analyze the individual costs associated with anterior crucial ligament reconstruction (ACLR), accounting for patient demographics, perioperative decision making, and location of the surgical procedure (hospital vs ambulatory surgery center), utilizing a cost-minimization analysis in a large national database.

METHODS

Univariate analysis and multiple linear regression were performed to determine which patient and surgical variables were the largest cost drivers for ACLR in the United States according to the State Ambulatory Surgery and Services Database.

RESULTS

The average cost for ACLR (n = 14,713) was $24,707 (standard deviation, $15,644). When patient variables were considered, younger age (P < .001), male sex (P < .001), Hispanic ethnicity (P < .001), number of chronic medical conditions (P < .001), Medicare insurance (P < .001), and quartile of household income (P < .001) were all associated with higher costs after ACLR. For operative variables, time spent in the operating room (P < .001), meniscal repair (P < .001), and use of general anesthesia alone (P < .001) were all associated with higher costs for ACLR. There was no significant difference between cost of surgery performed at a private surgery center and cost at a hospital-owned center. In the multivariate regression, the 3 variables with the greatest influence on cost of ACLR were use of isolated general anesthesia (associated with an increase of $2,049), Hispanic ethnicity ($1,828), and >1 chronic medical condition ($1,749). Male sex, time in operating room, and older age also significantly increased ACLR cost.

CONCLUSIONS

The greatest contributor to cost of ACLR was the use of general anesthesia alone. Time spent in the operating room increased ACLR cost by $108 per minute. Patient factors included greater age, male sex, Hispanic ethnicity, number of chronic medical conditions, Medicare insurance, and annual income. Meniscal repair and regional nerve block did not significantly affect cost as determined by multivariate regression.

Patient characteristics and incidence of childhood hospitalisation due to hypertrophic cardiomyopathy in the United States of America 2001-2014

This study investigated patient characteristics in paediatric hospitalisations for hypertrophic cardiomyopathy. We used Nationwide Inpatient Sample, which is the largest all-payer inpatient database in the United States, yielding nationally representative estimates, from 2001 to 2014. ICD-9-CM diagnostic codes identified hospitalisations for patients with hypertrophic cardiomyopathy and &lt;18 years. Outcomes included yearly rate of hospitalisation, death, admission via emergency department, and need for surgery. Predictors of interest were age groups (&lt;1, 1-9, and ⩾10 y/o), sex, and race/ethnicity. Logistic regression modelled associations, adjusted by patient- and hospital-level variables. With 2302 weighted hospitalisations, hospitalisation rates were 0.22 per 100,000 children/year, with higher rates for &lt;1 y/o (0.42) and ⩾10 y/o (0.31). Male-to-female ratios were more prominent in the oldest age group; 2.7:1 in ⩾10 y/o versus less than 1.7:1 for &lt;10 y/o. In-hospital mortality was 1.5%, with highest mortality rates among the &lt;1 y/o (6.3%). Children ⩾10 y/o had 5.59 times higher risk of admission from the emergency department than 1-9 y/o age group. Both ⩾10 and &lt;1 y/o age groups had lower risk of surgical intervention compared to the 1-9 y/o group with odds ratio 0.56 and 0.26, respectively. Black children had higher risk of admission from the emergency department than White children with odds ratio 2.78. A relation between age group and sex was observed, with sex-based differences in prevalence and treatment of hypertrophic cardiomyopathy becoming more pronounced with age. Further studies are needed to clarify mechanisms behind age and racial disparity in hospitalisation, especially admission source.

Predictors of Hospital Reuse Among Publicly Insured Children Hospitalized for Status Asthmaticus

BACKGROUND

Asthma is a common cause of pediatric hospitalization. Nonadherence to asthma medications is associated with worse outcomes; however, there is a paucity of data regarding posthospitalization prescription filling and hospital reuse. Our objective was to identify patients at risk for hospital reuse after being hospitalized for asthma.

METHODS

This is a retrospective study of patients with asthma who were discharged from a children's hospital in which we use Medicaid claims data to evaluate prescription fills within 30 days and 12 months. Chart reviews were used for demographics, chronic asthma severity, admission severity, and hospital reuse. t and χ² tests were performed for continuous and categorical variables. A generalized linear mixed model was fitted to predict the odds of hospital reuse, which was defined as requiring an emergency department visit or rehospitalization. Survival analysis using log-rank testing was used for modeling the time to hospital reuse.

RESULTS

Fifty-four percent of patients discharged with asthma had hospital reuse within 1 year of discharge. There was no association between hospital reuse and prescription filling for systemic steroids (odds ratio [OR] 1.30; confidence interval [CI]: 0.85-2.00; P = .21) or controller medications (OR 1.5; CI: 0.92-2.52; P = .10). There was a higher number of controller and systemic steroid prescription fills over 12 months for patients with hospital reuse. The factors associated with greater odds of hospital reuse were severity of chronic asthma diagnosis (P = .03) as well as African American race (OR 1.92; CI: 1.17-3.13; P = .01).

CONCLUSIONS

For Medicaid-insured patients discharged with asthma, worse chronic asthma severity and African American race were associated with greater odds of hospital reuse. Decreased prescription filling was not associated with greater odds of hospital reuse.

The Economic Burden of Pediatric Asthma in the United States: Literature Review of Current Evidence

Asthma is a chronic respiratory disease that is widespread throughout the US population and disproportionately affects children. This literature review aimed to identify recent information regarding the economic burden of pediatric asthma in the US. MEDLINE, EMBASE, Econlit, and PsycINFO databases and gray literature sources were searched from January 2012 to January 2018 to capture relevant publications. Publications reporting on healthcare resource utilization and/or healthcare costs of pediatric asthma were included (n = 8). Total direct costs of pediatric asthma were US$5.92 billion in 2013. Average annual costs per child ranged from US$3076 to US$13612. Across studies, pharmacy (US$1027-2120), inpatient (US$337-2016) and outpatient (US$1049-8039) costs were the primary contributors to healthcare costs. Inpatient and emergency department (ED) visits exerted a high economic burden. For instance, the national annual cost of asthma-related hospitalizations was estimated at US$1.59 billion in 2009, while estimates of costs-per-hospitalization (2010) and charges-per-discharge (2009) were US$3600 and US$8406, respectively. The total cost of ED visits to Medicaid was estimated at US$272 million in 2010. In a mixed-insurance population, ED cost estimates ranged from US$152 to US$172 annually per patient. Invariably, costs for children with asthma were significantly greater than for children without. Pediatric asthma imposes a significant economic burden to the US healthcare system. Children with asthma have significantly higher healthcare resource utilization and costs than children without asthma.

The Short-Term Effects of Ambient Air Pollutants on Childhood Asthma Hospitalization in Taiwan: A National Study

This investigation determined the effects of air pollution on childhood asthma hospitalization in regions with differing air pollution levels in Taiwan over a long time period. Data of childhood hospital admissions for asthma in patients aged 0–18 years and air quality in eight regions for the period 2001–2012 in Taiwan were collected. Poisson generalized linear regression analysis was employed to identify the relative risks of hospitalization due to asthma in children associated with exposure to varying levels of air pollutants with a change in the interquartile range after adjusting for temperature and relative humidity. Particulate matter ≤2.5 μm (PM_2.5), particulate matter ≤10 μm (PM₁₀), ozone (O₃), sulfur dioxide (SO₂), and nitrogen dioxide (NO₂), were positively associated with childhood asthma hospitalization, while O₃ was negatively associated with childhood asthma hospitalization. SO₂ was identified as the most significant risk factor. The relative risks for asthma hospitalization associated with air pollutants were higher among children aged 0–5 years than aged 6–18 years and were higher among males than females. The effects of air pollution on childhood asthma were greater in the higher-level air pollution regions, while no association was observed in the lower-level air pollution regions. These findings may prove important for policymakers involved in implementing policies to reduce air pollution.

Prepregnancy asthma and the subsequent risk of central nervous system defects in offspring

BACKGROUND

The relationship between childhood asthma and central nervous system defects in offspring is poorly understood. We assessed if childhood asthma was associated with the risk of having an infant with neural tube or other nervous system defects compared with asthma during pregnancy.

METHODS

We analyzed a longitudinal cohort of 128,060 women who were 5 years or less at study entry and later delivered an infant in Quebec, Canada (1989-2014). We identified women hospitalized for asthma before pregnancy, including childhood and adolescence, and determined if asthma was present during pregnancy based on obstetric records. Main outcomes were neural tube and non-neural tube defects in pregnancy. We used log-binomial regression models to determine risk ratios (RR) and 95% confidence intervals (CI) for the association between asthma and risk of nervous system defects, adjusting for patient characteristics.

RESULTS

Asthma was associated with a greater risk of neural tube defects in offspring (RR 2.39, 95% CI 1.03-5.53) compared with no asthma, but not non-neural tube defects (RR 1.10, 95% CI 0.71-1.71). Women whose asthma resolved before pregnancy had a greater risk of neural tube defects (RR 3.43, 95% CI 1.35-8.69), while women with asthma during pregnancy were at greater risk of non-neural tube defects, especially microcephaly (RR 2.80, 95% CI 1.23-6.40).

CONCLUSIONS

Asthma that resolved before pregnancy was associated with an increased risk of neural tube defects in offspring but not non-neural tube defects. Further investigation is needed to determine the pathophysiology connecting childhood asthma with nervous system defects in offspring.