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J Appl Physiol (November 15, 2002). doi:10.1152/japplphysiol.00256.2002
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Articles in PresS, published online ahead of print November 15, 2002
J Appl Physiol, 10.1152/jap.00256.2002
Submitted on March 27, 2002
Accepted on November 7, 2002

Breath-by-breath measurement of the volume displaced by diaphragm motion

Bhajan Singh1*, Janine A Panizza2, and Kevin E Finucane2

1 Department of Pulmonary Physiology, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia; Department of Physiology, University of Western Australia, Perth, Western Australia, Australia
2 Department of Pulmonary Physiology, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia

* To whom correspondence should be addressed. E-mail: Bhajan.Singh{at}health.wa.gov.au.

To develop an accurate method to measure the volume displaced by diaphragm motion ({Delta}Vdi) breath-by-breath, we compared {Delta}Vdi measured by a previously evaluated biplanar radiographic method (J Appl Physiol 2001;91:1913-23) at several lung volumes during vital capacity inspirations in 10 healthy and 9 hyperinflated subjects with (a) {Delta}Vdi measured from the same CXRs by two previously described uniplanar methods (Petroll et al. J Appl Physiol 1990;69:2175-82, Verschakelen et al. J Appl Physiol 1992;72:1536-40) and a proposed method which considered actual cross-sectional shape of the rib cage and spinal volume ({Delta}VdiS) and, (b) {Delta}VdiS measured by lateral fluoroscopy in the same 10 healthy subjects. Relative to biplanar {Delta}Vdi, VdiS from lateral CXRs and fluoroscopy were not different, whereas {Delta}VdiPetroll and {Delta}VdiVerschakelen were increased by (mean±SD) 1.98±1.59L and 1.16±0.82L respectively (both p<0.001). During quiet breathing, {Delta}VdiS by lateral fluoroscopy was 66±16% of tidal volume and similar to that between FRC and 1/2 inspiratory capacity by the biplanar radiographic method. We conclude that accurate breath-by-breath measurements of {Delta}Vdi can be made using lateral fluoroscopy.




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