Obtención del Pletismograma de Impedancia Eléctrica con Dispositvos Portátil y Oculto (Impedance Plethysmography Detection with Mobile and Concealed Devices)

Óscar Alberto Garcia (IPG; Cardiovascular monitoring; Heart Rate monitor)1, José Antonio Pérez1, Pablo Samuel Luna (paluna@uv.mx)1, Carlos Alvarado (calvarad@cinvestav.mx)2


1Universidad Veracruzana
2CINVESTAV-IPN

This paper appears in: Revista IEEE América Latina

Publication Date: April 2016
Volume: 14,   Issue: 4 
ISSN: 1548-0992


Abstract:
This work describes the design of two devices for measuring the blood volume changes, in the forearm with a portable device and in the thighs through clothes in seated position. When blood volume arrives to the measurement site from the left ventricle, the electrical properties of the body segment change. These changes, that mainly comprise the electrical impedance of the tissue, are measured through the injection of a safely ac current and the detection of the voltage changes due to blood flow. The signal recorded with such a method is the impedance plethysmogram (IPG). For the portable device, an analog processing converts the IPG waveform to square pulses and a microcontroller performs the on-line estimation of the heart rate. Accuracy of the results accomplishes the standards of the Association for the Advancement of Medical Instrumentation for heart rate monitors. When measuring the IPG in the thighs through clothes, on the other hand, the main inconvenient are the stray capacitances that modify the waveform of the measured signal. However, if proper cares are taken, the waveform is good enough to extract the heart rate in the post processing.

Index Terms:
IPG, Cardiovascular monitoring, Heart Rate monitor   


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