Diseño de un Módulo de Medición de Gasto Cardíaco Empleando el Método de Detección de Bioimpedancia

摘要

The necessity of monitoring cardiac output and others hemodynamic parameters has lead to the development of multiples invasive and not invasive methods. Fick cardiac output and thermo dilution methods have been considered as golden rules nevertheless both are invasive, highly risky and can not be applied to all patients both need to be used in spe-cial environments by highly skilled personnel. Bioimpedance cardiac output a not invasive method are also been developed and clinically used since 1969 during this long period many technological improvements has made possible increase its confidence and accuracy. Essentials schema of a cardiac output bioimpedance monitor is shown in this paper it mainly consist in: circuit of elec-trical induction stimuli of 75htz distributed in four different neck and thorax locations paired with four records electrodes to reading circuit of bioimpedance electric difference. ECG, R wave recording is also included. Electric stimula-tion is synchronized to R wave in order to accurate establish dZ/dt. Appropriated algorithm calculates cardiac output and derívate parameters.