Automatic Diagnosis of Cardiac Diseases by Cepstral Processing of Bioimpedance Signal

The bioimpedance method used in this study consists of application of rectangular electrical current (30 Khz, 1 mA), which is harmless to the patient, by means of two electrodes placed respectively in the front and above the leading edge of the heart. Two electrodes, placed on the chest of the patient at the level of aorta 2 or 3 cm apart, permit perception of bioimpedance signal (BS) representing impedance variation DeltaZ of the explored thoracic region.