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Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
Published on: January 8, 2019
Volumetric capnography and chronic obstructive pulmonary disease staging
Pablo V Romero1, Benigno Rodriguez, Daniela de Oliveira
1Laboratorio de Función Pulmonar, Servicio de Neumologia, Hospital Universitario de Bellvitge, IDIBELL, Hospitalet de Llobregat, Barcelona, Spain. pvromero@csub.scs.es
International Journal of Chronic Obstructive Pulmonary Disease
|January 31, 2008
Summary
Volumetric capnography offers a viable alternative for assessing COPD severity when spirometry is challenging. New indices, Index of Airways Heterogeneity (IAH) and Index of Ventilatory Efficiency (IVE), show high accuracy in evaluating functional impairment.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Spirometry, a standard test for COPD, can be difficult for some patients to perform accurately.
- Volumetric capnography presents a potential alternative for assessing the severity of functional disturbances in Chronic Obstructive Pulmonary Disease (COPD).
Purpose of the Study:
- To evaluate the hypothesis that volumetric capnography can serve as a secondary test for assessing COPD functional severity.
- To determine the efficacy of novel indices derived from volumetric capnography in staging COPD patients.
Main Methods:
- 98 subjects (14 normal ex-smokers, 84 COPD patients staged by GOLD criteria) underwent spirometry and volumetric capnography.
- Key parameters measured included Bohr Dead Space (V(D)Bohr), Airways Dead Space (V(D)aw), Phase III slope (Sl(III)), and Volume of alveolar ejection (V(AE)).
- Calculated indices: Index of Ventilatory Efficiency (IVE) and Index of Airways Heterogeneity (IAH).
Main Results:
- Index of Airways Heterogeneity (IAH) demonstrated the strongest association with COPD stage (F >40) independent of tidal volume (V(T)).
- Receiver operating characteristic (ROC) curve analysis yielded an area under the curve >0.9 for both IAH and IVE across all stages.
- IAH and IVE achieved sensitivity = specificity values exceeding 80%.
Conclusions:
- Index of Airways Heterogeneity (IAH) and Index of Ventilatory Efficiency (IVE) are reliable alternative measures for evaluating functional impairment in COPD patients.
- These indices are particularly useful when spirometry performance is compromised, offering accurate assessment of disease severity.
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