Veterinary monitor user’s manual
Chapter 5-1
Chapter 5 Parameters Measurement
5.1 Measurement of ECG/HR
5.1.1 Principles of Measuring
Before the mechanical contraction, the heart will firstly produce electrization and
biological current, which will be conducted to body surface through tissue and humors;
the current will present difference in potential in different locations of the body, forming
potential difference ECG, also known as body surface ECG or regular ECG, is obtained by
recording this changing potential difference to form a dynamic curve. Monitor measures
the changes in the body surface potentials caused by the heart of the patient, observes the
cardioelectric activities, records the cardioelectric waveforms and calculates the HR
through the multiple electrodes connected to ECG cable.
5.1.2 Precautions during ECG Monitoring
Warning: Before connecting the ECG cables to the monitor, please check if the
lead wires and cables have been worn out or cracked. If so, they should be replaced.
Warning: It is imperative to only use the ECG cables provided with the
instrument by manufacturer.
Warning: The equipment is capable of displaying the ECG signal in the
presence of pacemaker pulses without rejecting pacemaker pulses.
Warning: To avoid burning, when the electrotome operation is performed, the
electrodes should be placed near the middle between ESU grounding pad and
electrotome and the electrotome should be applied as far as possible from all other
electrodes, a distance of at least 15 cm/6 in is recommended.
Warning: When the electrotome operation is performed, the ECG leads should
be intertwisted as much as possible. The main unit of the instrument should be
placed at a distance from the operation table. Power wires and the ECG lead cables
should be partitioned and should not be in parallel.
Warning: The monitor is protected against defibrillation effect. When applying
defibrillator to the patient, the monitor will experience transient disorderly
waveforms. If the electrodes are used and placed correctly, the display of the monitor
will be restored within 5 seconds. During defibrillation, the chest leads such as V
1
~V
6
should be removed and such limb electrodes as RA, LA, RL, LL should be moved to
the side of the limbs.