10 - 25
10.9.6.2
Selecting Leads for QT Calculation
You can select one lead or all leads for QT calculation. To do so, follow this procedure:
1.
Select the QT numerics area, ECG numeric area, or ECG waveform area to enter the
ECG
menu.
2.
Select the
QT
tab
→
select the
Setup
tab.
3.
Set
QT Leads
.
All
is selected by default. This means all leads are used for QT calculation.
10.10 ECG Relearning
Changes in ECG template could result in incorrect arrhythmia alarms and/or inaccurate heart rate. ECG
relearning allows the monitor to learn new ECG template so as to correct arrhythmia alarms and HR value. Once
learning is complete, the dominant QRS complex is stored as a reference template. The reference template is
used as a normal morphology of that patient and it is compared with incoming beats to identify possible
arrhythmias.
10.10.1 Auto ECG Relearning
Auto arrhythmia relearning happens in the following situation:
■
The ECG lead type or lead label is changed.
■
ECG leads are off and are not reconnected within 60 seconds.
■
The patient‘s paced status is changed.
10.10.2 Initiating an ECG Relearning Manually
If you suspect that abnormal arrhythmia alarms are presented, you may need to manually initiate an ECG
relearning. To do so, follow this procedure:
1.
Select the ECG numeric area or waveform area to enter the
ECG
menu.
2.
Select
Relearn
at the bottom left corner of the menu.
CAUTION
•
Take care to initiate ECG relearning only during periods of predominantly normal rhythm and when
ECG signal is relatively noise-free. If ECG learning takes place during arrhythmia, the ectopics may
be incorrectly learned as normal QRS complex. This may result in missed detection of subsequent
events of arrhythmia.
10.11 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. For more information,
see
.
10.12 Defibrillation Synchronization Pulse Output
The monitor 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.
WARNING
•
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 (sync pulse) on the
monitor 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.
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