The SS31L records the parameters associated with Cardiac Output measurements. The SS31L incorporates a precision high frequency current source, which injects a very small (400 µA rms) 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.
Use the SS31L to measure changes in Cardiac Output under a variety of conditions: laying down, sitting up, standing up, and post-exercise. See BSL PRO Lesson H21 Impedance Cardiography for sample SS31L setup and data. Use with EL506 Bioimpedance Strip Electrodes. Use on stationary subjects; the SS31L is sensitive to motion artifact.
The SS31L simultaneously measures Impedance Magnitude (Zo; labeled "Z" on the module) and Derivative of Impedance Magnitude (dZ/dt; labeled "DZ" on the module).
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