CardioDynamics BioZ Electrodes & Accessories by Vermed

CardioDynamics BioZ Electrodes & Accessories

Four pairs of electrodes are placed at the neck and the diaphragm level, delineating the thorax
High frequency, low magnitude current is transmitted through the chest in a direction parallel with the spine from the set of outside pairs
Current seeks path of least resistance: the blood filled aorta (the systolic phase signal) and both vena cava superior and inferior (the diastolic phase signal, mostly related to respiration)
The inside pairs, placed at the anatomic landmarks delineating thorax, sense the impedance signals and the ECG signal
ICG measures the baseline impedance (resistance) to this current
With each heartbeat, blood volume and velocity in the aorta change
ICG measures the corresponding change in impedance and its timing
ICG attributes the changes in impedance to (a) the volumetric expansion of the aorta (this is the main difference between ICG and Electrical Cardiometry) and (b) to the blood velocity-caused alignment of erythrocytes as a function of blood velocity
ICG uses the baseline and changes in impedance to measure and calculate hemodynamic parameters