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THEORETICAL AND METHODOLOGICAL ASPECTS OF BODY PLETHYSMOGRAPHY AND CLINICAL APPLICATIONS

https://doi.org/10.12737/20131

Abstract

One of the methods to evaluate lung function is body plethysmography. Body plethysmography allows to measure indicators that cannot be obtained during spirometry, that is: total lung capacity (TLC), bronchial resistance (Raw), and functional residual capacity (FRC). FRC measured by body plethysmography reflects thoracic gas volume (TGV or VTG), and includes both ventilated and poorly ventilated volume. Plethysmographic measurements are based on the principle of the relationship between pressure and volume at constant temperature and fixed amount of gas. This principle states that the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain unchanged within a closed system (Boyle-Mariotte Law). In body plethysmography, the following parameters: TGV, vital capacity (VC), expiratory reserve volume (ERV), tidal volume (TV), inspiratory reserve volume (IRV), inspiratory capacity (IC), Raw are obtained. TLC, residual volume (RV) and its share in total lung capacity can be calculated. Reduced TLC allows to diagnose restrictive disorders of pulmonary ventilation. The RV and its share in TLC increase together with airway obstruction indicates air trapping. The TGV increase together with airway obstruction indicates hyperinflation. In the analysis of lung volumes predictive values, which are calculated by the formulas recommended by ATS/ERS statement, are used. The results are expressed as a percentage of the predicted value. Thus, body plethysmography is an important addition to spirometry and image methods of research, allowing to assess the functional state of the lungs more objectively; it helps to conduct the differential diagnosis and control the course of the disease.

About the Authors

Olʹga I. Savushkina
Main Military Clinical Hospital n.a. acad. N.N.Burdenko
Russian Federation


Aleksandr V. Chernyak
Pulmonology Research Institute of Federal Medical and Biological Agency
Russian Federation


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For citations:


Savushkina O.I., Chernyak A.V. THEORETICAL AND METHODOLOGICAL ASPECTS OF BODY PLETHYSMOGRAPHY AND CLINICAL APPLICATIONS. Bulletin Physiology and Pathology of Respiration. 2016;(60):117-124. (In Russ.) https://doi.org/10.12737/20131

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ISSN 1998-5029 (Print)