Whole body plethysmography is a non-invasive, diagnostic technique used to assess various parameters related to lung function and respiratory mechanics. It involves the measurement of changes in body volume, particularly thoracic gas volume (TGV), during respiration. This technique is performed within a sealed, airtight chamber known as a plethysmograph.
During a whole body plethysmography test, the individual enters the chamber and is asked to breathe through a mouthpiece or a mask connected to an external pressure transducer. As the individual breathes, changes in pressure within the chamber are recorded. These pressure changes reflect changes in TGV, which can be further analyzed to obtain valuable data about lung volumes, airflow, and airway resistance.
The obtained measurements from whole body plethysmography can help clinicians diagnose and monitor various respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and pulmonary fibrosis. Parameters commonly derived from this technique include total lung capacity (TLC), residual volume (RV), functional residual capacity (FRC), and specific airway resistance (sRaw).
Whole body plethysmography offers several advantages over other lung function tests. It provides a comprehensive assessment of respiratory mechanics and is suitable for individuals of all ages, including infants and the elderly. Additionally, it is a non-invasive technique that does not require the administration of any drugs or exposure to radiation.
In summary, whole body plethysmography is a diagnostic technique that utilizes changes in body volume to assess lung function. It is a valuable tool for evaluating respiratory conditions and provides important information about lung volumes and airway resistance.
