|Title:||Bronchial Responsiveness and Lung Function in a Cohort of College Students of Medical Technology Ⅲ.Plethysmgraphic Measurement of Thoracic Gas Volume
醫技系學生支氣管反應性與肺功能調查 第三報：以體積描記法測定胸 腔氣體容積
|Keywords:||Plethysmography;thoracic gas volume;functional residual capacity;body box;measurement||Issue Date:||2003||Journal Volume:||v.15||Journal Issue:||n.1||Start page/Pages:||21-25||Source:||JOURNAL OF BIOMEDICAL AND LABORATORY SCIENCES||Abstract:||
The thoracic gas volume (Vtg) measured by the body plethysmographic method is often considered to be numerically equal to the functional residual capacity (FRC) recorded by the closed circuit helium dilution method. In the clinical practice, however, this is not entirely true even in normal subjects. To investigate the differences in absolute lung volumes measured by this two methods in healthy young Chinese adults, we made both measurements of FRC and Vtg on 42 healthy college students. The mean difference between the Vtg and the communicating gas volume measured by helium dilution in these subjects, regardless of gender, was 260 ± 225 ml. The values for Vtg were equal ( differed by less than 100 ml) to those for FRC in only one- third of the study population. In addition, none of these normal subjects showed a Vtg smaller than the communicating gas volume. We conclude that the Vtg, by virtue of including abdominal gas , is consistently equal to or larger than the FRC in normal Chinese young adults. Consequently, when the Vtg is used to measure FRC, a larger total lung capacity may be anticipated.
|Appears in Collections:||醫學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.