Patient monitor User’s manual
Chapter 15-1
Impedance cardiography (ICG) is a safe, non-invasive method based on
thoracic electrical bioimpedance (TEB) technology, which measures the level
of change in impedance in the thoracic fluid, and generates ICG waveform,
and calculates hemodynamic parameters.
15.2 Calculated Parameters
The following parameters are calculated:
The Heart Rate is calculated from the ECG-signal.
Reference range: 60…90 min-1
Stroke Volume is the amount of blood pumped by the left ventricle each
beat. It is calculated using the Sramek/Bernstein formula:
Reference range: depends on BSA
BSA (Body surface area) is calculated from the patient’s height, weight, and
gender. The DuBois formula is used for calculation.
SVRI (Systemic Vascular Resistance Index)
Systemic Vascular Resistance Index is the resistance to the flow of blood
through the arterial system the heart works against. It is often referred to as
“Afterload” and is calculated as:
Reference range: 1400-2200 dyn•s•cm-5•m2
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