Title :
Comparison of conductance to volume equations: The gain coefficient α
Author :
Porterfield, John E. ; Pearce, John A.
Author_Institution :
Electr. & Comput. Eng. Dept., Univ. of Texas, Austin, TX, USA
Abstract :
The conductance catheter technique is used to measure real-time pressure and volume data in a beating heart. There are three competing equations for transforming the raw conductance signal into volume: (1) Baan´s equation, (2) The cuvette equation (i.e. Relative Volume Units), and (3) Wei´s equation. This paper explores the accuracy of these three equations compared to ultrasound echo in mice, and discusses the reason for discrepancy regarding both Baan´s equation and the cuvette equation. We conclude that Wei´s equation is the most accurate, because its nonlinear mapping yields volumes in the range of physiologic norms.
Keywords :
bioelectric phenomena; blood pressure measurement; cardiology; catheters; electric admittance; Baans equation; Weis equation; beating heart; conductance catheter technique; cuvette equation; nonlinear mapping; real-time pressure measurement; ultrasound echo; volume data measurement; Algorithms; Animals; Aorta; Biomedical Engineering; Blood Pressure; Data Interpretation, Statistical; Echocardiography; Finite Element Analysis; Heart Conduction System; Heart Rate; Mice; Mice, Inbred C57BL; Models, Cardiovascular; Signal Processing, Computer-Assisted; Time Factors;
Conference_Titel :
Engineering in Medicine and Biology Society, 2009. EMBC 2009. Annual International Conference of the IEEE
Conference_Location :
Minneapolis, MN
Print_ISBN :
978-1-4244-3296-7
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2009.5333625
