Longitudinal Preschool Wheeze Biomarker Study

Recruiting

• Conditions: Wheezing

• Registration Number: NCT06237660
• Lead Sponsor: Imperial College London

Brief Summary

Preschool children (aged 1-5 years) account for 75% of all UK childhood wheezing hospitalisations. This has not changed over 20 years, meaning current treatments are not working and a new approach is needed. Currently, all preschool wheezers are treated with inhaled steroids. However, only about 25% of patients, with allergies, respond well to inhaled steroids; for the other 75%, they are ineffective. This research group has found that some preschool wheezers may have other causes but there are no specific, non-invasive tests to match the right treatment to each child.

The goal of this observational study is to test various bedside tests for this purpose in preschool children with wheeze, to see if they are feasible, accurate and acceptable in this age group.

The research team would like to investigate the following aims:

Aim 1 - To test the proposed panel of simple bedside tests below, to see how accurately they corelate with lower airway infection or inflammation.

Aim 2 - To test the acceptability of these bedside tests are to parents and children, and if they reflect the child's symptoms, symptoms control and medication use.

Aim 3- A small proof-of -concept study, to test if these simple bedside tests, can be used to determine treatment for each individual child.

The panel of simple non-invasive tests that the research team are proposing are:

1. Skin prick tests to common allergies (house dust mite, cat, dog, grass, tree pollen, mixed moulds)

2. Finger prick blood test

3. Phlegm test for bacteria

4. Nose and throat swab for bacteria

5. Lung function test called forced oscillation technique (FOT)

Detailed Description

Research Question:

Can the research team identify simple bedside tests that can give quick, accurate results while being acceptable to parents and children, and can these tests be successfully used in clinical practice, to decide treatment for preschool wheeze?

Participants will be asked to do these simple tests- skin prick test, finger prick blood test, breathing test, throat swab, and a test to catch their phlegm. The researchers will use two tests to identify children who are likely to respond to inhaled steroids: skin tests for allergies and a finger prick blood test. To identify children with bacterial infections in their lungs, where antibiotics will be useful, the team will obtain a sample of sputum (phlegm) after a salty mist inhalation (saline nebuliser), and will test the accuracy of a throat swab that detects bacteria. The research team will also test how cells called neutrophils work in children without allergies or infection with the same finger prick blood test above. A breathing test called forced oscillation will be used to identify children who may respond to their reliever "blue" inhaler during wheezing attacks.

The research team will also recruit a small number of children, for a trial in which their treatment will be guided by their test result, to see if parents are willing to take part in such a study, before designing a larger trial. This study will be the first to show that new tests can identify different types of preschool wheezing and can be used to plan treatment based on individual children's needs. Researchers will compare to see if children who have their treatment based on the simple bedside tests do better than the children who are just given inhaled steroids.

Study Timeline

• Study First Submitted: 2023-11-29
• Study First Submitted QC: 2024-01-24
• Study Start: 2024-02-01
• Study First Posted: 2024-02-01
• Status Verified: 2024-04
• Last Update Submitted: 2024-04-26
• Last Update Posted: 2024-04-29
• Primary Completion: 2026-08-31
• Study Completion: 2026-08-31

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 150

Inclusion Criteria

Aim 1, 2 and 3:

• Children aged 1-5 years
• More than 2 hospitalisations for acute wheeze in the last year or
• At least 1 admission requiring high dependency unit or intravenous bronchodilator therapy in the last year.

Aim 1 only:

• children undergoing clinically indicated bronchoscopy, as determined by their existing medical team, as part of their standard management

Exclusion Criteria

• Alternative respiratory diagnosis such as cystic fibrosis or bronchiectasis.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Longitudinal study of oropharyngeal swab and induced sputum PCR as a biomarker of airway infection	3 years	Specificity, sensitivity and longitudinal stability of oropharyngeal swab and induced sputum PCR (measured by detectable presence or absence of DNA from Haemophilus influenzae, Streptococcus pneumoniae and Moraxella catarrhalis) as biomarkers of airway infection. Concordance between oropharyngeal swab and induced sputum PCR results from the same patient will also be assessed.
Longitudinal study of skin prick tests as biomarkers of preschool wheeze	3 years	Specificity, sensitivity and longitudinal stability of skin prick tests to six common allergens (measured by size of wheal in response to skin prick, measured in mm) as a biomarker of allergen sensitisation.
Longitudinal study of finger-prick point of care test for eosinophil count as a biomarker of preschool wheeze	3 years	Specificity, sensitivity and longitudinal stability of a finger-prick point of care test for eosinophil count (measured as cells per cubic mm) as a biomarker of eosinophilic inflammation.
Longitudinal study of blood neutrophil phenotype as a biomarker of airway infection	3 years	Specificity, sensitivity and longitudinal stability of blood neutrophil phenotype (measured as mean fluorescence intensity for indicative phenotype markers) as a biomarker of airway infection.
Longitudinal study of blood neutrophil chemotaxis as a biomarker of wheezing phenotype	3 years	Specificity, sensitivity and longitudinal stability of blood neutrophil chemotaxis (measured in micrometers per minute) as a biomarker of wheezing phenotype.
Longitudinal study of lung function test (FOT) as a biomarker of airway reversibility	3 years	Specificity, sensitivity and longitudinal stability of lung function test (forced oscillation technique or FOT), measured by lung reactance and lung resistance (Rrs: respiratory system resistance; Xrs: respiratory system reactance; AX: area of reactance), as biomarkers of airway reversibility in wheezing patients.

Secondary Outcome Measures

Name	Time	Method
Patient acceptability of finger prick blood eosinophil count as a non-invasive biomarker in preschool wheeze	3 years	Determining the patient acceptability of finger prick blood eosinophil count as a non invasive biomarker test, using the Visual Analogue Scale (VAS) of pain intensity. The scale ranges from 0 to 10, with 0 being no pain or discomfort and 10 for worst pain possible. Higher scores indicate worse tolerability.
Patient acceptability of forced oscillation technique as a non-invasive biomarker to determine lung function and airway reversibility in preschool wheeze	3 years	Determining the patient acceptability of forced oscillation technique as a non invasive biomarker test, to determine lung function and airway reversibility in preschool children, using the Visual Analogue Scale (VAS) of pain intensity. The scale ranges from 0 to 10, with 0 being no pain or discomfort and 10 for worst pain possible. Higher scores indicate worse tolerability.
Patient acceptability of skin prick test as a non-invasive biomarker in preschool wheeze	3 years	Determining the patient acceptability of skin prick test as a non invasive biomarker test, using the Visual Analogue Scale (VAS) of pain intensity. The scale ranges from 0 to 10, with 0 being no pain or discomfort and 10 for worst pain possible. Higher scores indicate worse tolerability.
Association between eosinophil counts and patient symptom control	3 years	Measurement of eosinophil counts (measured as cells per cubic mm) in relation to patient symptom control, using the Test for Respiratory and Asthma Control in Kids (TRACK), a caregiver-completed validated questionnaire for preschool-aged children (measured as mean symptom score). TRACK is a 5-item standardized questionnaire, with each item being scored from 0 to 20 points on a 5-point Likert-type scale. Total score ranging from 0 to 100. Higher scores indicate better respiratory and asthma control; a score of less than 80 points suggests that a child's breathing problems might not be controlled.
Patient acceptability of oropharyngeal swab and induced sputum PCR as a biomarker of airway infection in preschool wheeze	3 years	Determining the patient acceptability of oropharyngeal swab and induced sputum PCR as a biomarker of airway infection in preschool children, using the Visual Analogue Scale (VAS) of pain intensity. The scale ranges from 0 to 10, with 0 being no pain or discomfort and 10 for worst pain possible. Higher scores indicate worse tolerability.
Correlation between eosinophil counts and symptom burden of preschool wheeze to caregivers	3 years	Correlation between measurement of eosinophil counts (measured as cells per cubic mm) and assessment of symptom burden of preschool wheeze to caregivers using the validated Paediatric Asthma Caregivers Quality of Life Questionnaire (PACQLQ), measured by mean life quality score. This is a questionnaire that is self-administered by the caregiver, and assess symptom burden to caregivers, across two domains (activity limitations and emotional function). Each question is assessed using a 7-point Likert scales, with 1 indicating severe impairment and 7 indicating no impairment. Domains scores are calculated as the mean score across items in that domain. The overall score is the mean score across all items. The lowest score achievable is 1 and highest score achievable is 7, and higher scores indicate better quality of life.

Trial Locations

Locations (1)

Royal Brompton Hospital; 🇬🇧 London, United Kingdom