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Trial details imported from ClinicalTrials.gov

For full trial details, please see the original record at https://clinicaltrials.gov/ct2/show/NCT05034367




Registration number
NCT05034367
Ethics application status
Date submitted
1/09/2021
Date registered
5/09/2021
Date last updated
9/03/2023

Titles & IDs
Public title
Reference Ranges for the Cough Responsiveness to Inhaled Mannitol
Scientific title
Reference Ranges for the Cough Responsiveness to Inhaled Mannitol
Secondary ID [1] 0 0
5801151
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Cough 0 0
Condition category
Condition code
Respiratory 0 0 0 0
Other respiratory disorders / diseases

Intervention/exposure
Study type
Interventional
Description of intervention(s) / exposure
Diagnosis / Prognosis - Mannitol challenge

Experimental: Healthy persons - The responses of the healthy subjects are utilized to create reference ranges for a normal cough response to mannitol


Diagnosis / Prognosis: Mannitol challenge
Inhalation challenge with dry powder of mannitol with a maximal cumulative dose of 635 mg
Intervention code [1] 0 0
Diagnosis / Prognosis
Comparator / control treatment
Control group

Outcomes
Primary outcome [1] 0 0
Cough-to-dose ratio
Timepoint [1] 0 0
Coughs are recorded during the 60 seconds after each mannitol dose

Eligibility
Key inclusion criteria
- age 18 years or older

- capable to understand the purpose of the study

- female/male ratio approximately 50%/50% in both of the following age groups:

- 50% aged 18- 50 yrs, and 50 % aged 51 - 90 years
Minimum age
18 Years
Maximum age
90 Years
Sex
Both males and females
Can healthy volunteers participate?
Yes
Key exclusion criteria
- Current daily smoking

- Ex-smoking with a greater than 10 pack years' daily smoking history or with stopping
of daily smoking less than one year ago

- Pregnancy and breastfeeding

- A doctor's diagnosis of any respiratory diseases, including both upper and lower
airway diseases, lung parenchymal diseases and the sleep apnoea syndrome

- A doctor's diagnosis of gastro-oesophageal reflux disease or symptoms suggestive of it

- Current use of angiotensin-converting enzyme inhibitors

- Upper respiratory tract infection ('flu') within 4 weeks

- Any current (within 4 weeks) cough 8

- Chronic (over 2 months' duration) cough during the last 12 months

- Wheezing during the last 12 months

- Attacks of shortness of breath or cough at night during the last 12 months

- Symptoms of rhinitis in a prolonged fashion during the last 12 months

- Heartburn or regurgitation once a week or more often during the last 3 months

- Abnormal anatomy of the respiratory organs, which may affect the deposition of the
mannitol powder

- Any previous operations to the respiratory organs that can affect the deposition of
the mannitol powder

- Unable to provide written informed consent to participate in the study

Study design
Purpose of the study
Diagnosis
Allocation to intervention
N/A
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?



Intervention assignment
Single group
Other design features
Phase
Not Applicable
Type of endpoint/s
Statistical methods / analysis

Recruitment
Recruitment status
Recruiting
Data analysis
Reason for early stopping/withdrawal
Other reasons
Date of first participant enrolment
Anticipated
Actual
17/01/2022
Date of last participant enrolment
Anticipated
Actual
Date of last data collection
Anticipated
1/12/2024
Actual
Sample size
Target
140
Accrual to date
Final
Recruitment in Australia
Recruitment state(s)
NSW
Recruitment hospital [1] 0 0
John Hunter Hospital - Newcastle
Recruitment postcode(s) [1] 0 0
2305 - Newcastle
Recruitment outside Australia
Country [1] 0 0
Finland
State/province [1] 0 0
Kuopio

Funding & Sponsors
Primary sponsor type
Other
Name
Kuopio University Hospital
Address
Country
Other collaborator category [1] 0 0
Other
Name [1] 0 0
John Hunter Hospital
Address [1] 0 0
Country [1] 0 0

Ethics approval
Ethics application status

Summary
Brief summary
Cough is the most common reason why people seek medical attention in developed countries. The
main mechanisms for prolonged cough are hypersensitivity of the cough reflex arc, sputum
production, and constriction of the airway smooth muscles. Recognition of the mechanism in
each cough patient is essential for the efficient management of prolonged cough. At present,
there are no feasible tests for everyday clinical work to recognize cough reflex arc
hypersensitivity.

Mannitol test was originally developed for asthma diagnostics. We have recently shown that it
can also be used to investigate hypersensitive cough reflex arc. The purpose of the present
study is to create reference ranges for normal cough responsiveness to inhaled mannitol.
Without them, the test cannot be utilized in everyday clinical work. For that purpose we will
perform mannitol test in 140 subjects, who are at least 18 years old and without any chronic
respiratory symptoms or disorders. The subjects will be recruited in three centers:
University of Eastern Finland and: John Hunter Hospital in Australia.The material will be
collected 1.9.2021-31.12.2023. We apply funding for both personnel and material expences, to
carry out this study.
Trial website
https://clinicaltrials.gov/ct2/show/NCT05034367
Trial related presentations / publications
Public notes

Contacts
Principal investigator
Name 0 0
Address 0 0
Country 0 0
Phone 0 0
Fax 0 0
Email 0 0
Contact person for public queries
Name 0 0
Heikki O Koskela, MD
Address 0 0
Country 0 0
Phone 0 0
+358 447172795
Fax 0 0
Email 0 0
[email protected]
Contact person for scientific queries



Summary Results

For IPD and results data, please see https://clinicaltrials.gov/ct2/show/NCT05034367