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Volumetric capnography: reliability and reproducibility in spontaneously breathing patients
- Source :
- Clinical Physiology and Functional Imaging. 25:275-280
- Publication Year :
- 2005
- Publisher :
- Wiley, 2005.
-
Abstract
- Volumetric capnography provides a breath-by-breath analysis of ventilation-perfusion imbalances and deadspace volumes. The technique has been best described in intubated and ventilated patients, but promising clinical applications also concern spontaneously breathing patients. The objective of the study was to verify the reliability and reproducibility of a new capnographic program in various types of clinical conditions. In a first step, 56 patients, either healthy or with acute respiratory disorders, were connected to a sidestream gas sampler and flow sensor through a mouthpiece. An acquisition software synchronized expired CO2 and flow data to create volumetric capnographic curves. Mixed expired CO2 partial pressure, corresponding to the exhaled CO2 of the effective tidal volume, was simultaneously collected in a neoprene bag for comparison. In a second step, changes in airway deadspace before and after the adjunction of known spacer volumes were compared in six healthy volunteers. The mean difference between both methods in measuring mixed expired CO2 partial pressure was -0.9 mmHg (SE 0.2 mmHg, P
- Subjects :
- Adult
Physiology
Dead space
Pulmonary Disease, Chronic Obstructive
Capnography
Reference Values
Physiology (medical)
Humans
Medicine
Tidal volume
Reliability (statistics)
Mouthpiece
Aged
Heart Failure
Reproducibility
medicine.diagnostic_test
business.industry
Reproducibility of Results
Pneumonia
General Medicine
Carbon Dioxide
Middle Aged
Anesthesia
Respiratory Mechanics
Breathing
Pulmonary Embolism
Airway
business
Subjects
Details
- ISSN :
- 1475097X and 14750961
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Clinical Physiology and Functional Imaging
- Accession number :
- edsair.doi.dedup.....1440560d897854c7ec72c3d8b5c1f0ba
- Full Text :
- https://doi.org/10.1111/j.1475-097x.2005.00620.x