User Manual for Multi-parameter Patient Monitor North-vision Tech. Inc.
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Chapter 8 Monitoring Parameters
8.1 Measuring ECG
The electrocardiogram (ECG or EKG) is primarily a tool for evaluating the electrical events within the heart. The
action potentials of cardiac-muscle cells can be viewed as batteries that cause charge to move throughout the body
fluids. These currents represent the sum of the action potentials occurring simultaneously in many individual cells
and can be detected by recording electrodes at the surface of the skin. Figure below shows the system of the heart.
To obtain the high quality ECG signal, the hospital or the clinic should get ready the three-phase power supply
system with standard ground wire. If excessive interference exists, connect one end of the ground wire provided with
this equipment to the grounding pole on the back panel of this monitor, and the other end to the special ground wire,
water pipe or radiator.
A common ECG plate electrode used together with this monitor has a short shelf life. Generally, the shelf life is
only one month after the package is opened. When outdated plate electrode is used, due to sk
in’s contact impedance
and large electrode potential, the chance of interference will be increased, and the ECG baseline will become
unstable. Therefore, always use valid plate electrodes.
