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Noninvasive Cardiac Output Sensor – MP3X

Impedance Cardiography Module

Measure Impedance Magnitude (Zo) and Derivative of Impedance Magnitude (dZ/dt)

Noninvasive bioimpedance technique to measure relative differences in Cardiac Output and Stroke Volume

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Noninvasive Cardiac Output Sensor
Part #: SS31LA

The SS31LA simultaneously measures Impedance Magnitude (Zo; labeled “Z” on the module) and Derivative of Impedance Magnitude (dZ/dt; labeled “DZ” on the module). The SS31LA noninvasively records the parameters associated with Cardiac Output measurements.

  • Measure changes in Cardiac Output under a variety of conditions: laying down, sitting up, standing up, and post-exercise.
  • Use the Kubicek equation to determine Stroke Volume and Cardiac Output.
  • For respiration measurements, observe the associated variation in the Impedance Magnitude “Z” signal.

Use with an 8 spot electrode lead configuration and use on stationary subjects—the SS31LA is sensitive to motion artifact.

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Part #: SS31LA
Categories: Transducers - Education, Transducers - Research
Subcategories: Cardiac Output - Education, Cardiac Output - Research

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The SS31LA incorporates a precision high-frequency current source, which injects a small (400 µA rms @ 100 kHz sine wave) current through the measurement tissue volume defined by the placement of a set of current source electrodes. A separate set of monitoring electrodes then measures the voltage developed across the tissue volume. Because the current is constant, the voltage measured is proportional to the characteristics of the biological impedance of the tissue volume.

See BSL PRO Lesson H21 Impedance Cardiography for sample setup and data, as well as an extensively updated physiological introduction that covers Cardiac Output as a Function of Stroke Volume and Heart Rate, Cardiac Output as Related to Mean Arterial Pressure and Peripheral Resistance, How to Determine Cardiac Output, Principles of Impedance Cardiography (ICG), and Ideas for eliciting cardiovascular responses through physical maneuvers and psychological tasks.


Note: SS31LA replaces the SS31L, which had lead connectors designed for strip electrodes, such as EL506, which were discontinued due to manufacturing limitations.

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