The Effect of a Cold Air Eucapnic Hyperventilation Test on Lower Respiratory Airways in Healthy V… (NCT07220928) | Clinical Trial Compass
CompletedNot Applicable
The Effect of a Cold Air Eucapnic Hyperventilation Test on Lower Respiratory Airways in Healthy Volunteers and Patients With Asthma
Belgium60 participantsStarted 2023-08-04
Plain-language summary
In this study, we want to evaluate the feasibility and safety of a CAEH test in healthy volunteers and patients with asthma. We want to develop a CAEH test to differentiate patients with different types of asthma and exercise-induced bronchoconstriction from healthy volunteers and to evaluate whether the respiratory phenotype induced by cold air inhalation differs between subjects with asthma and healthy subjects. Furthermore, we want to evaluate whether the CAEH test is more robust over time compared to the EVH test. Previously, our lab has demonstrated that submaximal exercise at subfreezing temperatures in a climate chamber (-5°C) induces an acute respiratory response in patients with asthma and in healthy subjects who have been exposed to high PM10 (unpublished data). Finally, This study will serve as a preliminary study for a subsequent prospective study in which the results and optimized protocol obtained in this study will be used to further evaluate the feasibility of using this CAEH as a diagnostic tool in asthma compared to EIB (CLARINET2). The present study is required to develop a standardized CAEH test in a safe and feasible manner. This study will also help to identify appropriate endpoints (FEV1, multiple breath washout test, biomarkers…) of the subsequent studies.
Who can participate
Age range
18 Years – 65 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Age between 18 and 65 years old at time of signing informed consent
* BMI between 18 and 28 kg/cm2
* Ability to give informed consent and to comply with study protocol, in the investigator's judgement
* Non-smoking or ex-smokers for at least 12 months with less than 10 pack years
* Normal spirometry
Group specific:
Histamine positive healthy controls: histamine bronchial challenge test (\< 8 mg/ml) at screening Healthy controls: histamine bronchial challenge test (≥ 8 mg/ml) at screening
Patients with asthma:
* Physician-diagnosed asthma for at least 6 months
* Post-bronchodilator FEV1 of ≥ 80% at screening
* Documented airway reversibility either by means of post-bronchodilator reversibility of ≥ 12.% and ≥ 200 ml or in the previous 6 months or by means of documented airway hyperresponsiveness (histamine PC20 \< 4 mg/ml) at screening
* Asthma control questionnaire (ACQ) ≤ 1.5
* Regular treatment with ICS with or without LABA (unchanged dose for at least 30 days) at a low or medium dose of ICS
Exclusion Criteria:
* Previous history of intubation or admission to ICU due to asthma
* Severe asthma exacerbation within one month prior to screening visit
* Treatment with oral or systemic steroids within one month prior to screening visit
* Previous treatment with biologics for asthma
* Other major concurrent pulmonary (such as COPD, cystic fibrosis, sarcoidosis, interstitial lung disease, Churg-Strauss syndrome, allergic bronchopulmonary aspergillosis, …
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Proportional change in FEV1 after hyperventilation challenge
Timeframe: After each hyperventilation challenge: pre, immediately, 3, 5, 10, 15 and 30 minutes after the challenge