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The goal of this pilot study is to investigate if installing an air purifier in the homes of children and young people with asthma improves their asthma outcomes.
The main questions it aims to answer are:
Children and young people with asthma attending our clinic will be selected at random to be invited to take part. For those that take part, an air purifier (Rensair Ltd. - Rensair Compact) will be installed in their home for a one-year period. Data will be collected on numbers of asthma attacks, rescue oral steroids, quality of life, symptoms, lung function at the beginning and at three-monthly intervals throughout the study period. The acceptability to children and young people and their families taking part in this study of using an air purifier in their home will also be assessed.
The goal of this pilot study is to investigate if installing an air purifier in the homes of children and young people with asthma improves their asthma outcomes.
The main questions it aims to answer are:
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Installation of air purifier (Rensair Ltd - Rensair Compact) | Experimental | Rensair Compact air purifier unit will be installed in the homes of all children/young people participating in this study for a period of one-year. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Rensair Compact air purifier unit | Device | Installation of Rensair Compact air purifier (Rensair Ltd.) in the homes of children/young people participating in this study |
|
| Measure | Description | Time Frame |
|---|---|---|
| Number of asthma exacerbations (asthma attacks) | Asthma attacks and unscheduled healthcare visits due to acute asthma (including ED attendance, admission, GP/primary care attendance) - assessed by questionnaire and hospital-recorded attendances/admissions | 12 months |
| Number of rescue oral steroid courses | Number of rescue oral steroid courses - assessed by questionnaire and prescription data | 12 months |
| Quality of life - mini paediatric asthma quality of life questionnaire score | Quality of life using mini paediatric asthma quality of life questionnaire - the higher the score the better the quality of life | 12 months |
| Asthma control test score | Asthma control test (ACT) or child asthma control test score (cACT) - depending on age of participant - the higher the score the better the asthma control | 12 months |
| Amount of asthma reliever medication use per week | Amount of use of asthma reliever medication use over a one week period (assessed as a categorical value) | 12 months |
| Number of school days absent due to asthma | Number of school days missed due to asthma - assessed by questionnaire | 12 months |
| Number of parent/carer work days missed due to their child's asthma | Number of work days missed due to child's asthma - assessed by questionnaire |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| karl A Holden | University of Liverpool | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Alder Hey Children's Hospital | Liverpool | Merseyside | L12 2AP | United Kingdom |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 41705315 | Derived | Holden KA, Hawcutt DB, Sinha IP. Installing Air Purifiers in the Homes of Children With Severe Asthma: Outcomes and Family Perspectives From a Feasibility Study. Pediatr Pulmonol. 2026 Feb;61(2):e71509. doi: 10.1002/ppul.71509. |
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| 12 months |
| Forced expired volume in one second (FEV1) | Spirometry measurements using ERS/ATS criteria and Global Lung Initiative Reference z-score | 12 months |
| Forced vital capacity (FVC) | Spirometry measurements using ERS/ATS criteria and Global Lung Initiative Reference z-score | 12 months |
| FEV1:FVC | Spirometry measurements using ERS/ATS criteria and Global Lung Initiative Reference z-score | 12 months |
| Measurement of fraction of exhaled nitric oxide (FeNO) | Fraction of exhaled nitric oxide measurements | 12 months |
| Acceptability to children and families participating of using an air purifier in their home | Acceptability to children and young people and their families taking part in the study in terms of use of air purifier in their homes - assessed by questionnaire | 12 months |