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The roles of impulse oscillometry in detection of asthma control level.

The roles of impulse oscillometry in detection of asthma control level.

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
TCTR
Registry ID
TCTR20190709004
Enrollment
Unknown
Registered
2019-07-09
Start date
2019-06-28
Completion date
Unknown
Last updated
2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Clinical diagnosed&#45

Interventions

Clinical diagnosed&#45
asthma patients with age ≥ 20 years whose condition is stable&#44
had been previously diagnosed by a specialist pulmonologist in accordance with the GINA with normal spirometry (FEV1/FVC ≥ LLN and FVC ≥ LLN. Healthy control with aged ≥ 20 years old.,Healthy co
Diagnostic,Diagnostic
Asthma,Healthy volunteer

Sponsors

Faculty of Medicine, Chiang Mai University
Lead Sponsor
Department of Internal Medicine&#44
Collaborator
Faculty of Medicine&#44
Collaborator
Chiang Mai University
Collaborator

Eligibility

Sex/Gender
All
Age
20 Years to No maximum

Inclusion criteria

Inclusion criteria: Inclusion criteria: The study population will be recruited according to the following criteria: 1. Asthma group &#45; Clinical diagnosed&#45;asthma aged ≥ 20 years old &#45; Clinical diagnosed&#45;asthma based on episode breathlessness&#44; wheezing&#44; cough&#44; and tightness after incidental allergen exposure and/or bronchodilator responsiveness (≥ 12% and 200 milliliter increase in FEV1 after 2&#45;4 puffs of salbutamol. &#45; No history of chronic respiratory diseases other than asthma &#45; Non&#45;smokers or ex&#45;smoker < 5 packs&#45;year &#45; Stable disease with controller medication for at least 6 weeks &#45; Controller medication used for at least 3 month Healthy group &#45; Healthy subjects aged ≥ 20 years old &#45; No history of chronic respiratory diseases &#45; Non&#45;smokers or ex&#45;smoker < 5 packs&#45;year &#45; Normal spirometry

Exclusion criteria

Exclusion criteria: Exclusion criteria: The study population will be excluded from the study according to the following criteria: &#45; Unable to perform spirometry &#45; Unable to perform IOS &#45; Spirometry not met American Thoracic Society (ATS)/ European Respiratory Society (ERS) 2005 standard &#45; IOS not met standard recommended by Bickel et al and ERS standard

Design outcomes

Primary

MeasureTime frame
Cut off point of IOS parameter for diagnosis COPD 0 min (baseline) cmH2O—

Secondary

MeasureTime frame
ROC curve of IOS parameter for diagnosis COPD 0 min (baseline) percent—

Countries

Thailand

Contacts

Public ContactChaicharn Pothirat

Faculty of Medicine&#44; Chiang Mai University.

chaicharn.p@cmu.ac.th0815309950

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 9, 2026