BeneVision N22/N19 Patient Monitor Operator’s Manual 10 - 21
3. Switch on Show Markers.
10.7.9.5 Changing the ST Unit
The unit of ST measurements can be millivolt (mV) or millimeter (mm). To change the ST unit, 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 Unit tab.
3. Set ST Unit.
10.7.10 Adjusting ST Measurement Points
10.7.10.1 About ST Point, ISO Point, and J Point
The ST value for each beat complex is the vertical difference between the isoelectric (ISO) point and the ST point.
The ISO point provides the baseline. The ST point is at the midpoint of the ST segment. The J point is where the
QRS complex changes its slope. As the J point is a fixed distance away from the ST point, it can be useful to help
you correctly position the ST point.
10.7.10.2 Setting ST Point, ISO Point, and J Point
• You need to adjust the ST points before starting monitoring, or if the patient's heart rate or ECG
morphology changes significantly, as this may affect the size of the QT interval and thus the
placement of the ST point. Artifactual ST segment depression or elevation may occur if the
isoelectric point or the ST point is incorrectly set.
• Always make sure that the positions of ST points are appropriate for your patient.
To set ST point, ISO point, and J point, follow this procedure:
1. Select the ECG numeric area or waveform area to enter the ECG menu.
2. Select the ST tab→ select the Adjust tab.
3. Set ST Point.
The setting of Auto Adjust defines the method of adjusting the ISO point and J point. Auto Adjust is enabled by
default. In this case, positions of ISO point and J point are automatically adjusted accordingly. If you disable
when Auto Adjust, you need to manually adjust the position of ISO point and J point by selecting the arrows at
the right sides of ISO and J.
(1 ) I S O po i nt ( 2 ) J po i n t ( 3 ) S T p o i nt ( 4 ) S T v a l u e
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