Real-time monitor for hemodynamic beat-to-beat parameters and power spectra analysis of the biosignals

In this work a system for the online analysis of all relevant hemodynamic parameters is introduced. The parameters are heart rate, systolic, diastolic and mean blood pressure, stroke volume, cardiac output, total peripheral resistance, inotropic state, oxygen saturation, several time intervals, the power of the high and low frequency band of hemodynamic time series and baroreceptor reflex sensitivity. The system consists of a patient biosignal electronic system (PBES) which is a self calibrating, non-invasive instrument for ECG, impedance cardiography ICG, continuous blood pressure and pulse oximetry. The data acquisition (DAQ) system is a personal computer with a C-based software for DAQ and virtual instrumentation. This software is controlling the calibration routines of the PBES, detecting the beat-to-beat hemodynamic parameters, computing the sliding power spectra and calculating the baroreceptor sensitivity. The data are visualised in real-time on the screen and finally an automatic report of the investigation is printed. A new algorithm for online QRS-detection and a new rejection method for the RLS-algorithm are included.