Factors Determining the Waveform of Cardiokymography

概要

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The mechanism of detecting the cardiac wall motion by Cardiokymography (CKG) using a sensing coil was studied by the following experiments. 1) The precordial maps of CKG were recorded on 3 subjects. When the surface movement of the chest was eliminated by a piece of acrylic board in each subject, the amplitude of CKG was reduced to average of 22.7±2.5% of the initial amplitude (p<0.01). 2) As the content of salt was increased in water and blood above the probe, the oscillation frequency dropped slightly at first, then it went up beyond the initial value. 3) When an artificial pneumothorax was made in a dog, the amplitude was reduced. Then, by the application of an acrylic board, the wave form became flat. 4) CKG could not detect the movement of the resected canine heart containing blood in a normal saline solution. These data indicate that the capacitance was the main determinant of oscillation frequency in man and that the most significant factor of the wave form was the surface movement of the chest.
International Heart Journal刊行会の論文