2005•Unpublished venueRequires access
Whole-body plethysmography
David Barry Geffen
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Abstract
The word plethysmograph is derived from the Greek plethusmos (enlargement), and is related closely to plethus (fullness) and plethora (fullness). Indeed, the fundamental function of a whole-body plethysmograph is the measurement of intrathoracic gas volume (TGV) and volume change. Whole-body plethysmographs have been used to measure changes in lung volume over a range of volumes, from the scale of millilitres to litres. Early reports of whole-body plethysmography to determine thoracic gas volume (TGV) [1] and airway resistance (Raw) [2] measured volume changes of the order of millilitres, in terms of associated changes in plethysmograph and alveolar pressures (Pa), using the constant-volume variable-pressure plethysmograph. Changes in lung volume during compression and decompression of thoracic gas were measured while the subject