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A numerical investigation of heat transfer cardiac output measurements

Fotheringham, P. and Gourlay, A.R. and McKee, S. and Andrews, S. (2005) A numerical investigation of heat transfer cardiac output measurements. Journal of Theoretical Medicine, 6 (3). pp. 161-172. ISSN 1027-3662

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Abstract

Measurement of cardiac output is often investigated using a technique based on hot-film anemometry. Here, we discuss a modification to hot-film anemometry, which involves a cylindrical heating element mounted flush on the surface of a typical Swan-Ganz catheter. In contrast to traditional thermodilution, the method discussed here has the potential to allow continuous monitoring of cardiac output. This paper demonstrates that there is a simple approximate relationship between the power input to the device to maintain a temperature of one degree above blood heat and cardiac output. Since, the heat transfer and the fluid flow decouple, a numerical model of the heat transfer of a cylindrical catheter (with heating element) sitting concentrically within a rigid cylindrical artery is developed. Numerical results were obtained for a wide selection of flow profiles, including experimental data. The results indicate that the cardiac output/power input relationship is extremely robust with respect to flow profile and system parameter variation.

Item type: Article
ID code: 2232
Notes: The references of this article are secured to subscribers.
Keywords: cardiac output, pulsatility, hot-film anemometry, annulus, thermodilution, Physics
Subjects: Science > Physics
Department: Faculty of Science > Mathematics and Statistics
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 01 Dec 2006
    Last modified: 04 Oct 2012 11:57
    URI: http://strathprints.strath.ac.uk/id/eprint/2232

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