Optimal electrode array for ambulatory measuring of cardiac output based on the electrical impedance method.
- Author:
Yilin SONG
1
;
Shumei GAO
;
Akira IKRASHI
;
Ken-ichi YAMAKOSHI
Author Information
1. School of Mechanical & Electrical Engineering, Heilongjiang University, Harbin 150080, China. syl@hlju.edu.cn
- Publication Type:Journal Article
- MeSH:
Cardiac Output;
physiology;
Cardiography, Impedance;
methods;
Electric Impedance;
Electrodes;
Equipment Design;
Humans
- From:
Journal of Biomedical Engineering
2011;28(1):32-57
- CountryChina
- Language:Chinese
-
Abstract:
Principle of ambulatory cardiac output (CO) measuring technique is introduced in this paper. A lot of experimental studies of the current distribution on the thorax under the condition that the current injection electrodes were adhered to different positions were carried out by using a developed multi-channel impedance mapping system. The static impedance contour maps (Zo-map) and its pulsatile component contour maps (deltaZ-map) under different measuring conditions were analyzed, and the applicability of a two-compartment coaxial cylindrical model using a spot-electrode array instead of the conventional band-electrode array for ambulatory CO measurement, as well as the optimal spot-electrode array, were discussed. Based on the experimental results and the daily use of the ambulatory CO measuring technique, the optimal spot-electrode array meeting the condition of the two-compartment coaxial cylindrical model was determined as that a pair of spot-electrodes for current injection was located on the positions behind the ears and on the right lower abdomen, and a pair of spot-electrodes for voltage pick-up places on the medial portion at the level of clavicle and on the portion above the xiphisternum.
