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Risk factors for intensive care admission in children with severe acute asthma in the Netherlands: a prospective multicentre study

Shelley A. Boeschoten, Annemie L. Boehmer, Peter J. Merkus, Joost van Rosmalen, Johan C. de Jongste, Pieter L.A. Fraaij, Richard Molenkamp, Sabien G. Heisterkamp, Job B. van Woensel, Berber Kapitein, Eric G. Haarman, Roelie M. Wösten-van Asperen, Martin C. Kneyber, Joris Lemson, Stan Hartman, Dick A. van Waardenburg, Heleen E. Bunker-Wiersma, Carole N. Brouwer, Bart E. van Ewijk, Anneke M. Landstra, Mariel Verwaal, Anja A. Vaessen-Verberne, Sanne Hammer, Corinne M. Buysse, Matthijs de Hoog
ERJ Open Research 2020 6: 00126-2020; DOI: 10.1183/23120541.00126-2020
Shelley A. Boeschoten
1Intensive Care and Dept of Paediatric Surgery, Erasmus University Medical Center – Sophia Children's Hospital, Rotterdam, The Netherlands
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Annemie L. Boehmer
2Dept of Paediatrics, Maasstad Hospital, Rotterdam, The Netherlands
3Dept of Paediatrics, Spaarne Hospital, Haarlem, The Netherlands
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Peter J. Merkus
4Division of Respiratory Medicine, Dept of Paediatrics, Radboudumc Amalia Children's Hospital, Nijmegen, The Netherlands
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Joost van Rosmalen
5Dept of Biostatistics, Erasmus University Medical Center, Rotterdam, The Netherlands
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  • ORCID record for Joost van Rosmalen
Johan C. de Jongste
6Dept of Paediatric Pulmonology and Allergology, Erasmus University Medical Center – Sophia Children's Hospital, Rotterdam, The Netherlands
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Pieter L.A. Fraaij
7Dept of Paediatrics, Erasmus Medical Centre – Sophia Children's Hospital, Rotterdam, The Netherlands
8ViroScience, Erasmus Medical Centre, Rotterdam, Netherlands
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Richard Molenkamp
8ViroScience, Erasmus Medical Centre, Rotterdam, Netherlands
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Sabien G. Heisterkamp
9Paediatric Intensive Care Unit, Amsterdam University Medical Centers – Emma's Children's Hospital, Amsterdam, The Netherlands
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Job B. van Woensel
9Paediatric Intensive Care Unit, Amsterdam University Medical Centers – Emma's Children's Hospital, Amsterdam, The Netherlands
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Berber Kapitein
9Paediatric Intensive Care Unit, Amsterdam University Medical Centers – Emma's Children's Hospital, Amsterdam, The Netherlands
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Eric G. Haarman
10Dept of Paediatrics, Amsterdam University Medical Centers – Emma's Children's Hospital, Amsterdam, The Netherlands
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Roelie M. Wösten-van Asperen
11Paediatric Intensive Care Unit, Wilhelmina Children's Hospital/University Medical Center Utrecht, Utrecht, The Netherlands
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Martin C. Kneyber
12Paediatric Intensive Care Unit, Beatrix Children's Hospital/University Medical Center Groningen, Groningen, The Netherlands
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Joris Lemson
13Paediatric Intensive Care Unit, University Medical Center Nijmegen, Nijmegen, The Netherlands
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Stan Hartman
13Paediatric Intensive Care Unit, University Medical Center Nijmegen, Nijmegen, The Netherlands
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Dick A. van Waardenburg
14Paediatric Intensive Care Unit, Maastricht University Medical Center, Maastricht, The Netherlands
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Heleen E. Bunker-Wiersma
15Paediatric Intensive Care Unit, Leiden University Medical Center, Leiden, The Netherlands
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Carole N. Brouwer
15Paediatric Intensive Care Unit, Leiden University Medical Center, Leiden, The Netherlands
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Bart E. van Ewijk
16Dept of Paediatrics, Tergooi Hospital, Blaricum, The Netherlands
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Anneke M. Landstra
17Dept of Paediatrics, Rijnstate Hospital, Arnhem, The Netherlands
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Mariel Verwaal
2Dept of Paediatrics, Maasstad Hospital, Rotterdam, The Netherlands
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Anja A. Vaessen-Verberne
18Dept of Paediatrics, Amphia Hospital, Breda, The Netherlands
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Sanne Hammer
18Dept of Paediatrics, Amphia Hospital, Breda, The Netherlands
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Corinne M. Buysse
1Intensive Care and Dept of Paediatric Surgery, Erasmus University Medical Center – Sophia Children's Hospital, Rotterdam, The Netherlands
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Matthijs de Hoog
1Intensive Care and Dept of Paediatric Surgery, Erasmus University Medical Center – Sophia Children's Hospital, Rotterdam, The Netherlands
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Abstract

Rationale Severe acute asthma (SAA) can be fatal, but is often preventable. We previously observed in a retrospective cohort study, a three-fold increase in SAA paediatric intensive care (PICU) admissions between 2003 and 2013 in the Netherlands, with a significant increase during those years of numbers of children without treatment of inhaled corticosteroids (ICS).

Objectives To determine whether steroid-naïve children are at higher risk of PICU admission among those hospitalised for SAA. Furthermore, we included the secondary risk factors tobacco smoke exposure, allergic sensitisation, previous admissions and viral infections.

Methods A prospective, nationwide multicentre study of children with SAA (2–18 years) admitted to all Dutch PICUs and four general wards between 2016 and 2018. Potential risk factors for PICU admission were assessed using logistic regression analyses.

Measurements and main results 110 PICU and 111 general ward patients were included. The proportion of steroid-naïve children did not differ significantly between PICU and ward patients. PICU children were significantly older and more exposed to tobacco smoke, with symptoms >1 week prior to admission. Viral susceptibility was not a significant risk factor for PICU admission.

Conclusions Children with SAA admitted to a PICU were comparable to those admitted to a general ward with respect to ICS treatment prior to admission. Preventable risk factors for PICU admission were >7 days of symptoms without adjustment of therapy and exposure to tobacco smoke. Physicians who treat children with asthma must be aware of these risk factors.

Abstract

Preventable risk factors for PICU admission among those with severe acute asthma are >7 days of symptoms without adjustment of therapy and environmental exposure to tobacco smoke, underlining the importance of smoking cessation of caregivers https://bit.ly/3ezPzxT

Introduction

Severe acute asthma (SAA; status asthmaticus) is a severe and potentially fatal asthma exacerbation that does not respond to standard treatment with bronchodilators and systemic corticosteroids [1]. Every child with asthma is at risk of SAA, even those with mild asthma [2, 3]. Admission to a paediatric intensive care unit (PICU) occurs in 5–34% of all asthma hospitalisations [4–7]. Worldwide, the number of children requiring PICU admission increased markedly in the past decade, while the prevalence of asthma in children did not [4, 5, 8, 9]. Previously, we showed a three-fold increase of children with SAA admitted to Dutch PICUs between 2003 and 2013, with a significant increase over the years in the proportion of steroid-naïve children [9].

New asthma guidelines [10] advise clinicians to look for key triggers that put patients at an increased risk of an exacerbation [11]. Multiple studies have focused on risk factors for PICU admission, with different outcomes. Those risk factors included inhaled corticosteroids (ICS) use [2, 7, 12], longer asthma duration [13], sex [7, 12], ethnicity [2], previous emergency department visits [13] or (PICU) hospitalisations [2, 14, 16–], sensitisation to (multiple) aeroallergens [13, 15] and exposure to environmental tobacco smoke (ETS) [14].

In contrast to the above studies, we included all these risk factors in this multicentre (including all Dutch PICUs) prospective study. Identifying risk factors offers the opportunity for early intervention to avoid PICU admission of children with SAA. Since daily ICS is the most effective treatment to reduce asthma symptoms and prevent exacerbations [1, 17–20], we hypothesised that children without daily ICS are more prone to SAA requiring PICU admission. In addition, we looked into other risk factors such as ETS, viral infections, lower socioeconomic status (SES), sensitisation to (multiple) aeroallergens, and previous asthma-related healthcare visits.

Methods

We prospectively identified all children (aged 2–18 years) with SAA admitted to all seven Dutch academic PICUs or one of the paediatric wards of four participating general hospitals between 2016 and 2018. The four general hospitals were recruited based on geographical distribution over the Netherlands and needed to have a staff paediatric pulmonologist. Furthermore, these hospitals were good examples of general hospitals in the Netherlands, enhancing the external validity of the study. We included children aged ≥2 years, since SAA treatment is the same for children across all age ranges in the Netherlands. For each group (PICU and general ward), patients were recruited until the pre-planned sample size of 110 patients per group had been achieved. SAA was defined as a doctor-diagnosed asthma exacerbation requiring systemic corticosteroids and hospital admission. According to Dutch national guidelines, all children receive the same initial treatment: oxygen, continuous inhalation with salbutamol plus ipratropium and systemic corticosteroids [21]. When the asthma score, as developed by Qureshi et al. [22], is still ≥10 after three consecutive nebulisations with salbutamol plus ipratropium an intravenous magnesium sulphate bolus is administered. If continued nebulisation and i.v. magnesium sulphate lead to insufficient response, continuous infusion with salbutamol is started. When i.v. salbutamol is administered, children are transferred to a PICU, regardless of the dosage. Evidence indicates that this protocol is well followed in the Netherlands [9]. A child was classified as steroid-naïve when there was no maintenance treatment with ICS for >7 days before admission. The highest educational level of the parents and the postal code were used to determine SES. Ethnicity was defined as Caucasian or non-Caucasian. The severity of the exacerbation at the time of admission was classified using the Asthma Score. Additional details on the definition of SES, ethnicity and the Dutch guidelines for PICU admission are provided in the supplementary material.

Adherence to ICS was expressed as the proportion of days covered (PDC) in the period preceding the index admission [23], according to the pharmacy records. Continuous and categorical measures of ICS adherence were used. For the categorical measures a PDC of <80% (non-adherent) or a PDC ≥80% (adherent) were used. The cut-off values were chosen based on previous studies [24, 25].

We assessed a radioallergosorbent test for inhaled allergens in all children unless performed within the previous year. From every child, we acquired a nasal swab within 24 h after admission. The nasal swab was examined using real-time reverse transcriptase (RT)-PCR for the detection of viruses [26].

We determined urinary cotinine within 6 h after admission, as a proxy for ETS [27]. A value of <10 ng·mL−1 was interpreted as no recent ETS exposure; a value of 10–100 ng·mL−1 as second-hand smoke exposure; and a value >200 ng·mL−1 as active smoking [28].

A blood sample for DNA analysis was only collected if blood was drawn for standard care measurements. DNA was isolated from 200 μL of whole blood. Single nucleotide polymorphisms (SNPs) in the ADRβ2 at position 16 (rs1042713) and 27 (rs1042714), and SNPs in the CDHR3 (rs6967330) were characterised [29]. Further details on the methods for medication adherence and viral detection are provided in the supplementary material. Information about patient history, SES and environmental triggers was obtained from patients and caregivers using a web-based questionnaire, using LimeSurvey (version 2.06lts; www.limesurvey.org/).

Analyses

Data are presented as mean±sd or median (interquartile range). The Chi-squared test was used to compare categorical variables between both groups, and the Mann–Whitney test was used for continuous variables. Multivariate analysis was performed using multiple logistic regression analysis to evaluate the relationship between covariates and the probability of PICU admission.

Covariates were chosen based on the univariate analysis. Additional details on the sample size calculation and analyses are provided in the supplementary material. Given the potential difference in risk factors and diagnosis, a pre-planned subgroup analysis was performed for preschoolers (aged 2–4 years) versus school-aged children (aged 5–17 years). Statistical analyses were performed using SPSS (version 25; Chicago, IL, USA), and a two-sided significance level of 0.05 was used. Informed written consent was obtained before participation. The study was approved by the research ethics committee of the Erasmus Medical Center Rotterdam (MEC 2015–709) and adopted by the other hospitals.

Results

221 children were recruited into the study: 110 were admitted to the PICU and 111 to the general ward (figure 1). Table 1 shows their baseline characteristics.

FIGURE 1
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FIGURE 1

Flowchart of study enrolment. SAA: severe acute asthma; PICU: paediatric intensive care unit.

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TABLE 1

Baseline characteristics

Asthma was diagnosed before admission in 76% of the children admitted to the PICU and in 71% of the children admitted to the general ward. The proportion of steroid-naïve children, with or without a previous asthma diagnosis, did not differ significantly between PICU and general ward. Children admitted to the PICU were significantly older. Other significant factors associated with increased odds of PICU admission included being non-Caucasian, ICS adherence, asthma symptoms >1 week prior to admission and previous PICU admission (table 2). Two children died at the PICU of hypoxic ischaemic encephalopathy following out-of-hospital cardiac arrest, most likely due to patient delay and anaphylaxis.

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TABLE 2

Asthma severity

The presence of human rhinovirus (HRV), or other viruses, was not a risk factor for PICU admission (table 3).

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TABLE 3

Atopy and environmental triggers

Table 4 shows presentation and in-hospital management. The asthma severity scores (Qureshi score) at admission were comparable between groups.

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TABLE 4

Presentation and in-hospital management

Multiple logistic regression analysis revealed that a PICU admission was significantly more likely in children who were older, had had symptoms >1 week prior to admission and were exposed to ETS (table 5).

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TABLE 5

Multiple logistic regression analysis of risk factors for paediatric intensive care unit (PICU) admission

Preschool children admitted to a PICU were less often treated by a paediatric pulmonologist prior to admission than children in the general ward group (supplementary table S1).

In school-aged children, significant factors associated with increased odds of PICU admission included being non-Caucasian, an older age, presence of symptoms >1 week prior to admission, and high urinary cotinine (all p-values <0.017; supplementary table S2). In multiple logistic regression analysis, an older age, symptoms >1 week prior to admission and elevated cotinine remained statistically significant predictors of PICU admission (supplementary table S3).

Discussion

In this nationwide multicentre prospective study, we found no significant difference in the proportion of steroid-naïve children with SAA admitted to a PICU or a general ward. In general, PICU children were older, more exposed to tobacco smoke and had a longer duration of asthma symptoms before admission.

Daily ICS or ICS as rescue medication with a short-acting β-agonist (SABA) protects against asthma exacerbations compared to SABA alone [17, 30], but uncontrolled asthma is not rare [31], even in children with daily ICS, and was a risk factor for PICU admission in some studies [2, 7]. This might be due to the fact that children using ICS had persistent and more severe asthma and consequently a higher risk for SAA and PICU admission. This theory is supported by the fact that children admitted to the PICU had a significantly higher ICS dose prior to admission. In our study, risk factors for PICU admission seem to be driven by host (age, ethnic background and patient delay) and environmental (exposure to ETS) characteristics, rather than ICS use only. Targeted strategies aimed at the prevention of severe asthma exacerbations, even despite treatment with daily ICS, are needed. Strategies such as enhancing awareness in the general population of symptoms of asthma or uncontrolled asthma may empower the general public to seek medical help earlier than some parents in this study. The risk of children having dangerous asthma exacerbations as a result of cigarette smoke exposure is yet another clear effect of cigarette smoke exposure that legislatures need to take into account in smoke-free policies.

The most important risk factor for PICU admission was having symptoms for >1 week prior to admission. These children were significantly older (median age 8 years versus 6 years). Only 30% of the children with symptoms for >1 week prior to admission received oral corticosteroids (OCS) before arrival at the emergency department. Patient and doctor delay contributed to a longer duration of symptoms followed by a more severe attack. Early treatment with OCS in these children could have possibly prevented hospitalisation or PICU admission. Hospital admission produces a high level of stress on the child and caregivers, especially at the PICU. Furthermore, bed availability and the high medical costs emphasise the need for a more vigilant approach if symptoms persist to prevent PICU admission.

The age difference between the PICU and general ward group could be due to the fact that these groups represent different disease categories. Stein and Martinez [32] have shown that asthma phenotypes are markedly heterogeneous in the first 6 years of life. In fact, some of these phenotypes are transient and seem to behave idiosyncratically.

In agreement with previous studies, exposure to ETS was significantly associated with a higher frequency of PICU admission [2] or emergency department management failure [33]. In the PICU population, children with ETS-associated SAA deteriorated and recovered more slowly than non-ETS-exposed children [34]. Additional to previous studies we used urinary cotinine to quantify and identify ETS as an objective risk factor for PICU admission among children hospitalised for SAA. Caregivers should be made aware that ETS confers a four-fold increased risk for PICU admission in case of SAA, and offered appropriate support to stop smoking. Preferably, any financial obstacles should be reimbursed.

Our data corroborate previous studies reporting that the majority of children requiring hospital admission were allergically sensitised and had at least one viral respiratory infection identified, mostly due to rhinovirus [2, 13, 15, 35–38]. In our study, HRV-C was not a risk factor for PICU admission among children hospitalised for asthma. Although we found a high HRV-C prevalence, in itself it may be a risk factor for hospitalisation, but not differentiate in terms of severity beyond that point.

Children with SAA admitted to Dutch PICUs have a relatively short PICU stay compared with the general PICU population. According to the Dutch paediatric guideline for SAA [21], continuous i.v. administration of salbutamol requires immediate transfer to a PICU, regardless of the dosage. Hence, children in our study might have had less severe illness than asthmatic children in other PICU studies, as suggested by the low numbers of children requiring invasive mechanical ventilation and low mortality [2].

Of the children admitted to the PICU, 24% were first presentations. Hence in these children a PICU admission could not easily have been prevented except for education of the general public on asthma symptoms.

In addition, we looked at the effect of polymorphisms of the ADRβ2 and CDHR3 asthma risk alleles, since the ADRβ2 gene might reduce bronchodilator responsiveness in asthmatic children [39], and the CDHR3 asthma risk allele is associated with more severe HRV-C-induced asthma attacks [40]. In our study, genotyping of the ADRβ2 at position 16 (rs1042713) and 27 (rs1042714), and the CDHR3 asthma risk allele (rs6967330) showed no significant differences between PICU and general ward (data not shown). However, our study was not powered to detect a difference.

Limitations/strengths

Strengths of the present study are a high inclusion rate of 75% of children admitted to all Dutch PICUs, with standardised criteria for PICU admission. We investigated multiple potential risk factors, including objective measures such as cotinine in the urine for exposure to ETS, RT-PCR for viral infections, and use of asthma medication based on pharmacy records. There are some limitations as well. First, asthma was defined as diagnosed by a paediatrician prior to or during the exacerbation. The diagnosis was reviewed by a paediatric pulmonologist at the follow-up visits. We are well aware that asthma may be undistinguishable from acute viral wheeze in children aged <6 years; however, this will not affect treatment decisions in the setting of SAA. All children were seen by a paediatric pulmonologist during follow-up and 90% still used asthma medication after 3–9 months (the remaining 10% were lost to follow-up), which supports that the initial asthma diagnosis was correct. Second, data regarding lung function at time of presentation to the emergency department are lacking. Only 20 (18%) children in the PICU group had performed lung function testing recently: 13 children had airflow obstruction, nine children had forced expiratory volume in 1 s (FEV1) <80%. In the general ward group, 10 (9%) children performed a lung function test prior to admission: three children had airflow obstruction, with a FEV1 <80% in one child. Third, we used the PDC in the period preceding the index admission as a proxy for ICS treatment. Although the PDC is an objective measurement, this is not equivalent to the actual use of medication or good inhalation technique. Lastly, 30% of DNA analysis is missing in the general ward group because blood samples were only collected if blood was drawn for routine care measurements.

Conclusion

We found no significant differences in the proportion of steroid-naïve children between children with SAA admitted to the PICU versus those admitted to a general ward. Prolonged duration of symptoms prior to admission and environmental tobacco smoke exposure were clinically relevant strong risk factors for PICU admission. These are preventable triggers and our data clearly support the call for smoking cessation by caretakers of children. We recommend a rapid and vigilant approach for children with prolonged asthma symptoms as they are at high risk for PICU admission for SAA.

Supplementary material

Supplementary Material

Please note: supplementary material is not edited by the Editorial Office, and is uploaded as it has been supplied by the author.

Supplementary material 00126-2020.supp

Tables S1-S3 00126-2020.supp_tables

Acknowledgements

The authors thank the research consortium SKIC members (Dutch Collaborative PICU Research Network).

Footnotes

  • This article has supplementary material available from openres.ersjournals.com

  • This study is registered at www.clinicaltrials.gov with identifier number NCT02936778.

  • Conflict of interest: S.A. Boeschoten has nothing to disclose.

  • Conflict of interest: A.L. Boehmer has nothing to disclose.

  • Conflict of interest: P.J. Merkus reports grants from Chiesi Netherlands BV and Novartis Netherlands BV during the conduct of the study.

  • Conflict of interest: J. van Rosmalen has nothing to disclose.

  • Conflict of interest: J.C. de Jongste has nothing to disclose.

  • Conflict of interest: P.L.A. Fraaij reports grants from EU FP7 PREPARE (#602525).

  • Conflict of interest: R. Molenkamp has nothing to disclose.

  • Conflict of interest: S.G. Heisterkamp has nothing to disclose.

  • Conflict of interest: J.B. van Woensel has nothing to disclose.

  • Conflict of interest: B. Kapitein has nothing to disclose.

  • Conflict of interest: E.G. Haarman has nothing to disclose.

  • Conflict of interest: R.M. Wösten-van Asperen has nothing to disclose.

  • Conflict of interest: M.C. Kneyber has nothing to disclose.

  • Conflict of interest: J. Lemson has nothing to disclose.

  • Conflict of interest: S. Hartman has nothing to disclose.

  • Conflict of interest: D.A. van Waardenburg has nothing to disclose.

  • Conflict of interest: H.E. Bunker-Wiersma has nothing to disclose.

  • Conflict of interest: C.M. Brouwer has nothing to disclose.

  • Conflict of interest: B.E. van Ewijk has nothing to disclose.

  • Conflict of interest: A.M. Landstra has nothing to disclose.

  • Conflict of interest: M. Verwaal has nothing to disclose.

  • Conflict of interest: A.A. Vaessen-Verberne has nothing to disclose.

  • Conflict of interest: S. Hammer has nothing to disclose.

  • Conflict of interest: C.M. Buysse reports grants from the AMMODO and SAB foundations outside the submitted work.

  • Conflict of interest: M. de Hoog reports grants from the AMMODO and SAB foundations outside the submitted work.

  • Support statement: This study was financially supported by the Dutch Foundation for Asthma Prevention (Stichting Astma Bestrijding), Ammodo (Institute of Art and Science), unrestricted grants of Chiesi Pharmaceuticals BV Netherlands and Novartis Pharma, B.V. The Netherlands. Funding information for this article has been deposited with the Crossref Funder Registry.

  • Received March 9, 2020.
  • Accepted May 6, 2020.
  • Copyright ©ERS 2020
http://creativecommons.org/licenses/by-nc/4.0/

This article is open access and distributed under the terms of the Creative Commons Attribution Non-Commercial Licence 4.0.

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Risk factors for intensive care admission in children with severe acute asthma in the Netherlands: a prospective multicentre study
Shelley A. Boeschoten, Annemie L. Boehmer, Peter J. Merkus, Joost van Rosmalen, Johan C. de Jongste, Pieter L.A. Fraaij, Richard Molenkamp, Sabien G. Heisterkamp, Job B. van Woensel, Berber Kapitein, Eric G. Haarman, Roelie M. Wösten-van Asperen, Martin C. Kneyber, Joris Lemson, Stan Hartman, Dick A. van Waardenburg, Heleen E. Bunker-Wiersma, Carole N. Brouwer, Bart E. van Ewijk, Anneke M. Landstra, Mariel Verwaal, Anja A. Vaessen-Verberne, Sanne Hammer, Corinne M. Buysse, Matthijs de Hoog
ERJ Open Research Jul 2020, 6 (3) 00126-2020; DOI: 10.1183/23120541.00126-2020

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Risk factors for intensive care admission in children with severe acute asthma in the Netherlands: a prospective multicentre study
Shelley A. Boeschoten, Annemie L. Boehmer, Peter J. Merkus, Joost van Rosmalen, Johan C. de Jongste, Pieter L.A. Fraaij, Richard Molenkamp, Sabien G. Heisterkamp, Job B. van Woensel, Berber Kapitein, Eric G. Haarman, Roelie M. Wösten-van Asperen, Martin C. Kneyber, Joris Lemson, Stan Hartman, Dick A. van Waardenburg, Heleen E. Bunker-Wiersma, Carole N. Brouwer, Bart E. van Ewijk, Anneke M. Landstra, Mariel Verwaal, Anja A. Vaessen-Verberne, Sanne Hammer, Corinne M. Buysse, Matthijs de Hoog
ERJ Open Research Jul 2020, 6 (3) 00126-2020; DOI: 10.1183/23120541.00126-2020
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