AN ADVANCED SIGNAL-PROCESSING TECHNIQUE FOR IMPEDANCE CARDIOGRAPHY

A new design using the latest technique in signal processing, the time -frequency analysis method, was developed to process impedance cardiog raphy signals. This technique, when used to determine the relevant cal culation parameters, was found to he more accurate than conventional m ethods. It was shown to be advantageous in reducing ventilation artifa cts and motion noise, resulting in greater accuracy. Its cardiac outpu t values had a much better correlation coefficient when compared in th e clinical setting to the standard thermodilution technique than did t he values from conventional impedance cardiography devices.