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Updated: Jun 4, 2026
08:25
Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
Published on: January 8, 2019
Body plethysmography--its principles and clinical use.
C P Criée1, S Sorichter, H J Smith
1Evangelisches Krankenhaus Göttingen-Weende gGmbH, Department of Pneumology, Respiratory Care, Sleep Medicine, Pappelweg 5, D-37120 Bovenden-Lenglern, Germany. criee@ekweende.de
Respiratory Medicine
|March 2, 2011
Summary
Body plethysmography measures lung volumes like functional residual capacity (FRC) and airway resistance (Raw). This technique provides detailed insights into respiratory function beyond standard spirometry.
Area of Science:
- Pulmonary Function Testing
- Respiratory Physiology
Background:
- Body plethysmography is a key method for assessing lung volumes and airway resistance.
- Standard spirometry offers limited insights compared to plethysmography's detailed measurements.
Purpose of the Study:
- To explain the working principles of body plethysmography.
- To highlight the additional diagnostic information provided by body plethysmography compared to spirometry.
Main Methods:
- Utilizes a sealed body box to measure pressure variations.
- Calculates functional residual capacity (FRC) and specific airway resistance (sRaw).
- Determines airway resistance (Raw) from sRaw and FRC(pleth).
Main Results:
- FRC(pleth) and sRaw are primary measures obtained.
- Airway resistance (Raw) is derived, indicating airway obstruction.
- The method measures 'shift volume' via box pressure variations.
Conclusions:
- Body plethysmography provides a comprehensive understanding of respiratory mechanics.
- It offers significant advantages over spirometry in assessing lung function.
- The technique has potential for further advancements in respiratory diagnostics.
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