20 - 2 BeneVision N22/N19 Patient Monitor Operator’s Manual
20.1 ICG Introduction
Impedance cardiography (ICG) measures a patient’s hemodynamic status using a safe, non-invasive method
based on thoracic electrical bioimpedance (TEB) technology. ICG uses four pairs of sensors to transmit a small
electrical signal through the thorax. As velocity and volume of blood in the aorta change, the ICG measures the
changes in impedance from systole to diastole to calculate hemodynamic parameters.
Apply ICG monitoring only to patients in height of 122 to 229 cm, weight of 30 to 155 kg, and in age no less than
13.
20.2 ICG Safety Information
• ICG monitoring should not be used concurrently on patients with minute ventilation pacemakers
when the minute ventilation function is activated.
• The ICG module is not intended to be used while exposing the patient to high frequency current.
• Simultaneous use of high frequency electrosurgical equipment (ESU) during ICG monitoring may
result in burns at the stimulation site and can also adversely affect measurement accuracy. Make
sure the ESU return electrode is properly applied to the patient.
• During ICG monitoring, make sure that the conductive paste on the ICG sensors never come into
contact with other conductive parts.
20.3 ICG Measurement Limitations
The measurement accuracy may be compromised when patients present with the following conditions or
anomalies:
â– Septic shock
â– Aortic valve regurgitation and defect of septum
â– Severe aortic sclerosis or aortic prosthesis
â– Severe hypertension (MAP > 130 mmHg)
(1) ICG menu hard key (2) Check sensor hard key
(3) Module status indicator (4) ICG patient cable connector
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