Evaluating Forced Oscillation Technique (FOT) in Abolishing Flow Limitation in Patients With Stable Chronic Pulmonary Disease (COPD)
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 22
- 试验地点
- 1
- 主要终点
- Detection of Expiratory Flow Limitation by Mead and Wittenberger (M-W) Technique
研究概览
简要总结
To validate the capability of the Respironics Synchrony ventilator to properly detect Expiratory Flow Limitation (EFL) as compared to the gold standard method of detecting EFL via the Mead and Wittenberger technique.
详细描述
Positive end expiratory pressure (PEEP) is used in COPD patients to counteract the intrinsic PEEP (PEEPi), which represents the end expiratory recoil pressure of the total respiratory system due to the presence of dynamic hyperinflation (DH).
DH commonly occurs in COPD, where the presence of expiratory flow-limitation (EFL) requires the patient to breath at higher lung volumes to produce the necessary after appropriate leak correction, showed a sensitivity and specificity in detecting EFL expiratory flow. To be effective, the PEEP level applied to the patient should be equal to PEEPi.
The continuous monitoring of EFL could be a useful tool to select the minimum PEEP level required to abolish it.
EFL can be detected using the forced oscillation technique (FOT) by an index which quantifies, for each breath, the within-breath variations of respiratory reactance (delta Xrs) at 5Hz.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- — 至 80 Years（Child, Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Age < 80 years
- •Moderate - Severe COPD diagnosed by spirometry (according to the GOLD criteria - Global Initiative for Chronic Obstructive Lung Disease criteria)
- •Free from any exacerbation in the 6 weeks preceding the study
排除标准
- •Any co-existing cardio-pulmonary conditions which may result in a picture of ventilatory failure such as congestive cardiac failure, chest wall or neuromuscular disease, bronchopneumonia, pulmonary fibrosis, bronchiectasis, cystic fibrosis or obesity-hypoventilation syndrome
- •Clinically unstable; exacerbation within the preceding 6 weeks
- •The presence of pulmonary or extra-pulmonary neoplasia that is still active
- •The presence of a bleeding diathesis
- •Unstable coronary artery disease
- •Presence of tuberculosis, current infection or potentially infectious pathogen
- •Inability to provide informed consent to the study
研究组 & 干预措施
Respironics Synchrony ventilator (Non Invasive Ventilation)
Non Invasive Ventilation using forced oscillation technique (FOT)
干预措施: Respironics Synchrony ventilator (Non Invasive Ventilation) (Device)
结局指标
主要结局
Detection of Expiratory Flow Limitation by Mead and Wittenberger (M-W) Technique
时间窗: 2 hours
Number of breaths are cumulative across all participants were found to be flow limited, not-flow limited or indeterminate as determined by the Mead and Wittenberger (M-W) technique of esophageal pressure. Each participant's individual breaths was imported into Matlab software program that displayed the flow vs transpleural pressure and breaths were individually analyzed according to the Mead Wittenberger technique.
Detection of Expiratory Flow Limitation by a Commercial Mechanical Ventilator
时间窗: 2 hours
Number of participants found to have expiratory flow limitation as determined by a commercial mechanical ventilator.
Detection of Expiratory Flow Limitation
时间窗: within 2 hours
Expiratory flow limitation (EFL) is an increase in transpulmonary pressure (cmH2O) with no change expiratory flow (lpm). Expiratory Flow Limitation or absence thereof will be detected by using a measurement of changes in reactance (DeltaXrs - cmH2O\*s/L) it will be compared to the the Mead and Whittenberger technique (via esophageal balloon measuring transpulmonary pressures). Two measurements will be obtained, DeltaXrs and Transpulmonary pressure. Comparisons of these measurements will be made to determine if the participant exhibits EFL.
次要结局
未报告次要终点