Impedance Cardiography - How ICG Works

How ICG Works

  • Current is transmitted through the chest
  • Current seeks path of least resistance: the blood filled aorta
  • 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
  • ICG attributes the large change in impedance to the volumetric expansion of the aorta (this is the main difference between ICG and Electrical Cardiometry)
  • ICG uses the baseline and changes in impedance to measure and calculate hemodynamic parameters

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