Phase 2 Continuous Exhaled Breath Condensate pH in Mechanically Ventilated Patients
试验速览
- 阶段
- 不适用
- 入组人数
- 120
- 试验地点
- 1
研究概览
简要总结
Given the possible prognostic relationship between exhaled breath condensate pH and clinical symptoms, it is quite plausible that exhaled breath condensate pH can prove useful in the intensive care unit. For example, if exhaled breath condensate pH falls prior to the onset of clinical symptoms, it is likely that it can be useful as an early marker, heralding the onset of various inflammatory lung diseases. Specifically, exhaled breath condensate pH could be used as a safe, non-invasive screening tool for Ventilator Associated Pneumonia. Similarly, just as changes in exhaled breath condensate pH might predict the onset of disease, exhaled breath condensate pH changes might also mark the progression or resolution of disease (e.g. alerting clinicians to possible readiness for extubation). Although such notions are hypothetical, they are beginning to be supported by anecdotal evidence.
详细描述
The investigators have developed a method of collecting exhaled breath condensate pH continually from ventilated patients, which (1) takes samples from an exhaust port on the outside of the ventilator circuit, and (2) possesses no measurable resistance to the ventilator circuit (and, therefore the sampling procedure in no way affects the patient).
Now, additionally, we have performed the continuous collection process on 10 patients in the intensive care units, none of whom have had any ill effects from the collection process.
The placement of the exhaled breath condensate collection device on the ventilator exhaust port offers a simplified, accurate, and safe method of investigating the relationships between airway pH and various pulmonary inflammatory disease processes in intubated patients of all ages.
In order to further extend our study of airway pH in intubated subjects, we believe it is necessary to obtain more frequent exhaled breath condensate pH measurements from intubated subjects. To that end, we have developed a collection system that will also measure the pH of the collected exhaled breath condensate in a fashion similar to the methodology used for thousands of assays in our laboratory and other laboratories globally. This involves deaeration of the sample to remove carbon dioxide. In the lab environment, this is performed with Argon. In the ICU setting, we will accomplish the same effect by using wall oxygen.
The continuous exhaled breath condensate pH collection and assay system consists of a condenser attached to the exhaust port of the ventilator. The condenser is kept chilled to slightly above freezing temperature by a refrigeration system commonly employed in ICU settings. The collection device stays attached to the exhalation port of the ventilator continuously, for hours to days.
研究设计
- 研究类型
- Observational
入排标准
- 年龄范围
- 1 Hour 至 —（Child, Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Any intubated patients, aged birth to adulthood, who are on a ventilator in any University of Virginia (UVA) intensive care unit.
排除标准
- •Control subjects may not be taking oral or inhaled steroids or have asthma, chronic obstructive pulmonary disease (COPD), cystic fibrosis, bacterial or viral pneumonitis, or adult respiratory distress syndrome (ARDS).