Bioimpedance spectroscopy in haemodynamic analysis

McCullagh, W. A. M. and Ward, L. C. (2010). Bioimpedance spectroscopy in haemodynamic analysis. In: Rosalind Sadleir and Eung Je Woo, International Conference on Electrical Bioimpedance. XIV International Conference on Electrical Bioimpedance and 11th Conference on Biomedical Applications of Electrical Impedance Tomography (ICEBI & EIT 2010), Gainesville, FL, (012121.1-012121.4). 4 - 8 April 2010. doi:10.1088/1742-6596/224/1/012121


Author McCullagh, W. A. M.
Ward, L. C.
Title of paper Bioimpedance spectroscopy in haemodynamic analysis
Conference name XIV International Conference on Electrical Bioimpedance and 11th Conference on Biomedical Applications of Electrical Impedance Tomography (ICEBI & EIT 2010)
Conference location Gainesville, FL
Conference dates 4 - 8 April 2010
Proceedings title International Conference on Electrical Bioimpedance   Check publisher's open access policy
Journal name Journal of Physics: Conference Series   Check publisher's open access policy
Place of Publication Bristol, United Kingdom
Publisher Institute of Physics Publishing Ltd.
Publication Year 2010
Year available 2010
Sub-type Fully published paper
DOI 10.1088/1742-6596/224/1/012121
Open Access Status DOI
ISSN 1742-6588
1742-6596
Editor Rosalind Sadleir
Eung Je Woo
Volume 224
Issue 1
Start page 012121.1
End page 012121.4
Total pages 5
Collection year 2011
Language eng
Abstract/Summary Venous insufficiency is estimated to affect between 10% and 35% of the population in the US with symptoms ranging from mild discomfort to chronic ulceration which may reduce quality of life. Early diagnosis is the key to pre-emptive treatment. We have previously reported [5] an impedance technique for measurement of calf muscle pump function although it was noted that the results could be confounded by change in limb geometry during the exercise protocol. We report here a modified protocol to account for change in limb geometry. Impedance of a 20 cm segment of the calf was continuously recorded using an SFB7 bioimpedance spectrometer whilst subjects performed a sequence of manoeuvres: a) supine with leg raised (for 10 min); b) standing (4 s); c) plantar flexion (tiptoe, 4 s); d) standing elevated on one leg removing tension on the measured leg with the foot horizontal (4 s); e) with the leg relaxed (4 s) and then the sequence repeated. The impedance ratio, k (e-d)/(c-b), was the proportion of the impedance change, occurring during calf muscle pumping, due primarily to change in limb shape only, i.e. independent of the impedance change due to ejection of blood as a function of calf muscle pump action. Thus (1-k) can be used to correct the ejection fraction (%) calculated as (c-b)/(a-b)*100 for the confounding effect of change in limb geometry. Ejection fractions calculated by this method in 10 control subjects were 51.5 ± 30.1% with no values greater than 100% as found previously.
Subjects 3100 Physics and Astronomy
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collection: School of Chemistry and Molecular Biosciences
 
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