BeneVision N22/N19 Patient Monitor Operator’s Manual 10 - 25
10.8.6.3 Selecting the QTc Formula
The monitor uses the Hodges correction formula by default to correct the QT interval for heart rate. To select the
QTc formula, 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. Set
QTc Formula.
â—† Hodges:
â—† Bazett:
â—† Fridericia:
â—† Framingham:
10.9 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.
10.9.1 Auto ECG Relearning
Auto arrhythmia relearning happens in the following situation:
â– The ECG lead type or lead label is changed.
â– ECG leads are off and are not reconnected within 60 seconds.
■The patient‘s paced status is changed.
10.9.2 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.
• 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.
QTc QT 1.75 HearRate 60
–()×+=
QTc QT
HearRate
60
--------------------------


1
2
-- -
×=
QTc QT
HeartRate
60
-----------------------------


1
3
-- -
×=
QTc QT 154 1
60
HeartRate
-----------------------------
–


×+=
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