10 - 26 BeneVision N22/N19 Patient Monitor Operator’s Manual
10.10 Calibrating ECG
The ECG signal may be inaccurate due to hardware or software problems. As a result, the ECG waveform
amplitude becomes greater or smaller. In that case, you need to calibrate the ECG module. To do so, follow this
procedure:
1. Select the
Main Menu quick key → turn to the third page → from the System column select Maintenance
→ input the required password → select Ok.
2. Select the
Module tab.
3. From the bottom left corner of the menu select
Calibrate.
10.11 Defibrillation Synchronization Pulse Output
The MPM module provides an analog out connector to output defibrillation synchronization pulse. If a
defibrillator is connected, it receives a synchronization pulse (100 ms, +5 V) through the analog out connector
each time an R-wave is detected.
• Improper use of a defibrillator may cause injury to the patient. The operator should determine
whether to perform defibrillation or not according to the patient’s condition.
• According to AAMI specifications the peak of the synchronized defibrillator discharge should be
delivered within 60 ms of the peak of the R wave. The signal at the ECG output on the monitors is
delayed by maximum of 30 ms. Your biomedical engineer should verify that your ECG/Defibrillator
combination does not exceed recommended maximum delay of 60 ms.
• Before defibrillation, the user must ensure both defibrillator and monitor has passed the system test
and can be safely used combinedly.
• Before defibrillation, make sure that the Filter is set to Diagnostic. After defibrillation is finished,
select the filter mode as required.
10.12 ECG Troubleshooting
This section lists the problems that might occur. If you encounter problems when using the monitor or
accessories, check the table below before requesting for services. If the problem persists after you have taken
corrective actions, contact your service personnel.
Problem Corrective Actions
Noisy ECG traces 1. Check that electrodes are not detached or dry. Replace with fresh and
moist electrodes if necessary.
2. Check that leadwires are not defective. Replace leadwires if necessary.
3. Check that patient cable or leadwires are routed too close to other
electrical devices. Move the patient cable or leadwires away from electrical
devices.
Excessive electrosurgical Interference Use ESU-proof ECG cables. For more information, see
39.1 ECG Accessories.
Muscle Noise Inadequate skin preparation, tremors, tense subject, and/or poor electrode
placement.
1. Perform skin preparation again and re-place the electrodes. For more
information, see
10.4.1 Preparing the Patient Skin and 10.4.2 Applying
Electrodes
.
2. Apply fresh, moist electrodes. Avoid muscular areas.
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