Dysfunctional breathing is a common and clinically relevant problem in patients with chronic obstructive pulmonary disease (COPD), contributing to increased dyspnea perception, reduced exercise tolerance, and impaired quality of life. The Nijmegen Questionnaire (NQ) is a widely used symptom-based instrument for screening dysfunctional breathing; however, a validated Turkish version for patients with COPD is currently unavailable.
This observational methodological study aims to translate, culturally adapt, and evaluate the validity and reliability of the Turkish version of the Nijmegen Questionnaire (NQ-TR) in individuals with stable COPD.
Eligibility
Sex
ALL
Min age
18 Years
Max age
75 Years
Healthy volunteers
No
Inclusion Criteria:
* Adults aged 18 years and older
* Diagnosis of COPD confirmed according to GOLD criteria
* Clinically stable disease (no acute exacerbation or hospitalization within the last 4 weeks)
* Ability to read and understand Turkish
* Willingness to participate and provide written informed consent
Exclusion Criteria:
* Acute COPD exacerbation or respiratory infection within the previous 4 weeks
* Presence of severe cardiac, neurological, or systemic disease affecting questionnaire responses
* Coexisting pulmonary conditions such as bronchiectasis, lung cancer, prior pulmonary tuberculosis, pleural disease, or history of lung surgery
* Moderate to severe cognitive impairment or communication difficulties
* Severe visual or hearing impairment preventing questionnaire completion
* Pregnancy
* Refusal to participate or withdrawal during the study
Primary outcome measure(s)
Turkish version of the Nijmegen Questionnaire (NQ-TR) — Baseline and 1 week The Nijmegen Questionnaire is a validated self-report instrument used to assess symptoms related to dysfunctional breathing and hyperventilation. It consists of 16 items evaluating the frequency of respiratory and non-respiratory symptoms, with higher total scores indicating greater symptom severity. In this study, the Turkish-validated version of the Nijmegen Questionnaire (NQ-TR) will be used to evaluate dysfunctional breathing symptoms in participants.
Trial sites (1)
Facility
City
Region
Status
Esra Pehlivan
Istanbul
Turkey (Türkiye)
Recruiting
More Saglik Bilimleri Universitesi trials in Turkey
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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