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Time Course of Respiratory Oscillometry Parameters During Nasal High-Flow Therapy in Stable Chronic Obstructive Pulmonary Disease (NHFlOscillo)

6 августа 2026 г. обновлено: ADIR Association

Time Course of Respiratory Oscillometry Parameters During Exposure to Nasal High-Flow Therapy in People With Stable Chronic Obstructive Pulmonary Disease: A Prospective Open-Label Single-Arm Physiological Study

Chronic obstructive pulmonary disease (COPD) can affect the small airways and alter respiratory mechanics. Nasal high-flow therapy delivers warmed and humidified gas through nasal cannulas and may change airway resistance. Respiratory oscillometry is a noninvasive test that measures respiratory resistance and reactance during quiet breathing.

This prospective, single-center study will enroll 20 adults with severe or very severe stable COPD who have never used nasal high-flow therapy. During a single study visit lasting approximately 6 hours, participants will receive individualized nasal high-flow therapy for 4 hours. Respiratory oscillometry will be measured before exposure, immediately after device titration, and after 30, 60, 120, 180, and 240 minutes.

The primary objective is to describe the time course of the difference between respiratory resistance measured at 5 hertz and at 20 hertz (R5-R20), an indirect index of peripheral airway mechanical abnormalities. Secondary objectives are to describe changes in total and proximal respiratory resistance, respiratory reactance, resonant frequency, and area of reactance. The hypothesis is that nasal high-flow exposure will produce measurable, time-dependent changes in respiratory oscillometry parameters.

Обзор исследования

Статус

Еще не набирают

Условия

Вмешательство/лечение

Подробное описание

NHFlOscillo is a prospective, open-label, single-center, single-arm physiological study involving adults with stable severe to very severe chronic obstructive pulmonary disease (COPD). The study is designed to characterize the time course of respiratory oscillometry parameters during a standardized 4-hour exposure to heated and humidified nasal high-flow therapy.

Participants will attend a single study visit and will be instructed to take their usual medications before the visit. After providing written informed consent, baseline characteristics will be recorded, and participants will complete the modified Medical Research Council Dyspnea Scale (mMRC), the St George's Respiratory Questionnaire (SGRQ), the COPD Assessment Test (CAT), and the Leicester Cough Questionnaire (LCQ). Baseline impulse oscillometry (IOS) will then be performed using a calibrated Vyntus IOS system, with the participant seated and breathing quietly, in accordance with current European Respiratory Society technical standards.

Nasal high-flow therapy will be initiated at a flow rate of 15 L/min and a temperature of 34 °C. After 3 minutes, the temperature will be increased to 37 °C if tolerated; otherwise, it will be maintained at 34 °C. The flow rate will then be increased every 3 minutes to an individualized level consistent with usual clinical practice, up to a maximum of 40 L/min. In participants receiving long-term oxygen therapy, supplemental oxygen will be titrated to maintain an oxygen saturation comparable to that observed under their usual conditions without nasal high-flow therapy.

The exposure will be continued for a total of 4 hours and will be briefly interrupted to perform oscillometry measurements immediately after titration and at 30, 60, 120, 180, and 240 minutes after the start of nasal high-flow therapy.

The target sample size is 20 participants. Changes in oscillometry parameters over time will be analyzed using linear mixed-effects models, with measurement time included as a fixed effect and participant included as a random effect. Each post-exposure time point will be compared with the pre-exposure baseline. Results will be reported as mean differences with 95% confidence intervals and interpreted according to the minimal clinically important difference for each outcome, when available.

Prespecified subgroup analyses will be conducted in participants receiving long-term oxygen therapy and in participants with cough and sputum production. Cough and sputum production will be identified using two alternative operational definitions:

CAT: a score ≥2 on both items 1 and 2; SGRQ: cough on most days or several days per week (response option 1 or 2 to the item "I cough") and sputum production on most days or several days per week (response option 1 or 2 to the item "I bring up sputum").

Тип исследования

Интервенционный

Регистрация (Оцененный)

20

Фаза

  • Непригодный

Контакты и местонахождение

В этом разделе приведены контактные данные лиц, проводящих исследование, и информация о том, где проводится это исследование.

Контакты исследования

Места учебы

  • Франция
    • Normandy
      • Rouen, Normandy, Франция, 76000
        • ADIR Association
        • Контакт:
        • Главный следователь:
          • Tristan Bonnevie, PhD

Критерии участия

Исследователи ищут людей, которые соответствуют определенному описанию, называемому критериям приемлемости. Некоторыми примерами этих критериев являются общее состояние здоровья человека или предшествующее лечение.

Критерии приемлемости

Возраст, подходящий для обучения

  • Взрослый
  • Пожилой взрослый

Принимает здоровых добровольцев

Нет

Описание

Inclusion Criteria:

  • Age >18 years and <85 years;
  • Chronic obstructive pulmonary disease classified as Global Initiative for Chronic Obstructive Lung Disease (GOLD) spirometric grade III or IV;
  • Modified Medical Research Council dyspnea score ≥2;
  • Completed a pulmonary rehabilitation program at the study center;
  • Clinically stable, defined as no exacerbation and no treatment change during the previous 4 weeks;
  • With or without long-term oxygen therapy;
  • Never previously used nasal high-flow therapy;
  • Affiliated with a French social security system;
  • Able to read and understand the participant information and provide written informed consent.

Non-inclusion Criteria:

  • Under legal guardianship or curatorship;
  • Confirmed or suspected pregnancy;
  • Unable to provide informed consent;
  • Primary diagnosis of another chronic obstructive respiratory disease, such as asthma or primary bronchiectasis;
  • Severe or unstable cardiovascular disease, including uncontrolled cardiac arrhythmia, severe heart failure, recent myocardial infarction, or unstable angina;
  • Hemodynamic instability.

Exclusion Criteria:

• None

Учебный план

В этом разделе представлена ​​подробная информация о плане исследования, в том числе о том, как планируется исследование и что оно измеряет.

Как устроено исследование?

Детали дизайна

  • Основная цель: Фундаментальная наука
  • Распределение: Н/Д
  • Интервенционная модель: Одногрупповое задание
  • Маскировка: Нет (открытая этикетка)

Оружие и интервенции

Группа участников / Армия
Вмешательство/лечение
Экспериментальный: Nasal High-Flow Therapy
Participants receive individualized, heated and humidified nasal high-flow therapy (myAirvo 3, Fisher & Paykel Healthcare, New Zealand) for 4 hours during a single study visit, with repeated respiratory oscillometry assessments.
Устройство: Heated Humidified Nasal High-Flow Therapy
Therapy is initiated at 15 L/min and 34 °C. After 3 minutes, the temperature is increased to 37 °C if tolerated; otherwise it is returned to or maintained at 34 °C. Flow is increased every 3 minutes to an individualized clinically used level, up to 40 L/min. In participants receiving long-term oxygen therapy, supplemental oxygen is titrated to maintain a saturation comparable to the usual saturation without nasal high-flow therapy. Total exposure duration is 4 hours. The intervention is briefly interrupted for respiratory oscillometry immediately after titration and at 30, 60, 120, 180, and 240 minutes.

Что измеряет исследование?

Первичные показатели результатов

Мера результата
Мера Описание
Временное ограничение
Change From Baseline in Frequency Dependence of Respiratory Resistance (R5-R20)
Временное ограничение: Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Frequency dependence of respiratory resistance is calculated as respiratory resistance measured at 5 hertz minus respiratory resistance measured at 20 hertz (R5-R20). It is measured by impulse oscillometry using the Vyntus impulse oscillometry system (IOS) and expressed in kilopascals per liter per second (kPa/L/s). Percent-predicted values will also be reported when appropriate reference equations are available. The outcome is the change from the pre-exposure baseline at each post-baseline assessment during the exposure period. The registered measure is the repeated change from the pre-exposure baseline across the exposure period.
Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.

Вторичные показатели результатов

Мера результата
Мера Описание
Временное ограничение
Change From Baseline in Total Respiratory Resistance at 5 Hertz (R5)
Временное ограничение: Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Total respiratory resistance at 5 hertz (R5) is measured by impulse oscillometry and expressed in kPa/L/s. Percentage of predicted values will also be reported when reference equations are available.
Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Change From Baseline in Proximal Respiratory Resistance at 20 Hertz (R20)
Временное ограничение: Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Respiratory resistance at 20 hertz (R20), reflecting predominantly proximal airway resistance, is measured by impulse oscillometry and expressed in kPa/L/s. Percentage of predicted values will also be reported when reference equations are available.
Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Change From Baseline in Respiratory Reactance at 5 Hertz (X5)
Временное ограничение: Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Respiratory reactance at 5 hertz (X5) is measured by impulse oscillometry and expressed in kPa/L/s. Percentage of predicted values will also be reported when reference equations are available.
Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Change From Baseline in Resonant Frequency (Fres)
Временное ограничение: Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Resonant frequency (Fres) is measured by impulse oscillometry and expressed in hertz. Percentage of predicted values will also be reported when reference equations are available.
Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Change From Baseline in Area of Reactance (AX)
Временное ограничение: Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.
Area of reactance (AX) is measured by impulse oscillometry and expressed in kPa/L. Percentage of predicted values will also be reported when reference equations are available.
Baseline; immediately after individualized nasal high-flow titration; and 30, 60, 120, 180, and 240 minutes after starting nasal high-flow therapy.

Соавторы и исследователи

Здесь вы найдете людей и организации, участвующие в этом исследовании.

Спонсор

ADIR Association

Соавторы

Fisher and Paykel Healthcare
University of Rouen Normandie

Следователи

  • Главный следователь: Tristan Bonnevie, PhD, ADIR Association

Публикации и полезные ссылки

Лицо, ответственное за внесение сведений об исследовании, добровольно предоставляет эти публикации. Это может быть что угодно, связанное с исследованием.

Общие публикации

Даты записи исследования

Эти даты отслеживают ход отправки отчетов об исследованиях и сводных результатов на сайт ClinicalTrials.gov. Записи исследований и сообщаемые результаты проверяются Национальной медицинской библиотекой (NLM), чтобы убедиться, что они соответствуют определенным стандартам контроля качества, прежде чем публиковать их на общедоступном веб-сайте.

Изучение основных дат

Начало исследования (Оцененный)

1 сентября 2026 г.

Первичное завершение (Оцененный)

29 февраля 2028 г.

Завершение исследования (Оцененный)

29 февраля 2028 г.

Даты регистрации исследования

Первый отправленный

3 августа 2026 г.

Впервые представлено, что соответствует критериям контроля качества

3 августа 2026 г.

Первый опубликованный (Действительный)

6 августа 2026 г.

Обновления учебных записей

Последнее опубликованное обновление (Действительный)

10 августа 2026 г.

Последнее отправленное обновление, отвечающее критериям контроля качества

6 августа 2026 г.

Последняя проверка

1 августа 2026 г.

Дополнительная информация

Термины, связанные с этим исследованием

Ключевые слова

Дополнительные соответствующие термины MeSH

Другие идентификационные номера исследования

  • NHFlOscillo

Планирование данных отдельных участников (IPD)

Планируете делиться данными об отдельных участниках (IPD)?

ДА

Описание плана IPD

Data will be made available upon reasonable request for research purposes after publication. This includes de-identified data related to demographic characteristics, as well as endpoints published either in the main manuscript or any supplemental data. Requests should be sent to t.bonnevie@adir-hautenormandie.com

Сроки обмена IPD

Data will be made available after publication.

Критерии совместного доступа к IPD

Data will be made available upon request for research purposes. Requests should be sent to t.bonnevie@adir-hautenormandie.com.

Информация о лекарствах и устройствах, исследовательские документы

Изучает лекарственный продукт, регулируемый FDA США.

Нет

Изучает продукт устройства, регулируемый Управлением по санитарному надзору за качеством пищевых продуктов и медикаментов США.

Нет

Эта информация была получена непосредственно с веб-сайта clinicaltrials.gov без каких-либо изменений. Если у вас есть запросы на изменение, удаление или обновление сведений об исследовании, обращайтесь по адресу register@clinicaltrials.gov. Как только изменение будет реализовано на clinicaltrials.gov, оно будет автоматически обновлено и на нашем веб-сайте. .

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