title: [Optimal electrode array for ambulatory measuring of cardiac output based on the electrical impedance method].
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.
authors.affiliation: School of Mechanical & Electrical Engineering, Heilongjiang University, Harbin 150080, China. syl@hlju.edu.cn
authors.forename: Yilin
authors.initials: Y
authors.lastname: Song
authors.forename: Shumei
authors.initials: S
authors.lastname: Gao
authors.forename: Akira
authors.initials: A
authors.lastname: Ikrashi
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Yamakoshi
mesh_terms: D002302:Cardiac Output / Q000502:physiology*; D002307:Cardiography, Impedance / Q000379:methods*; D017097:Electric Impedance; D004566:Electrodes; D004867:Equipment Design; D006801:Humans