FILTERING RESPIRATION IN IMPEDANCE CARDIOGRAPHY

摘要

Impedance cardiography is a noninvasive method for determination of stroke volume (SV) of the human heart by evaluating heart action induced impedance changes in the thorax. As the inpedance signal is strongly influenced by noise, especially by respiration and movement artifacts, appropriate filtering has to be applied in order to minimize the error in SV calculation. This work compares different filtering methods to the standard high-pass and ensemble average filters.