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â—† Absolute: you can separately set the alarm properties for each ST alarm.
â—† Relative: you can set the alarm properties for ST Single and ST Dual alarms.
4. Set ST alarm properties.
10.8.8.2 Changing Leads for ST Display
The monitor automatically selects the three most deviated leads for ST display. You can also manually select the
leads. To do so, follow this procedure:
1. Select the ST numeric area, ECG numeric area, or ECG waveform area to enter the ECG menu.
2. Select the ST tab → select the Setup tab.
3. Set ST Segment. You can select up to 3 leads.
10.8.8.3 Showing ISO Point, J Point, and ST Point Marks
In the waveform area, the ISO point, J point, and ST point mark do not display on the ST segments by default. To
show these marks, follow this procedure:
1. Select the ST numeric area, ECG numeric area, or ECG waveform area to enter the ECG menu.
2. Select the ST tab→ select the Setup tab.
3. Switch on Show Markers.
10.8.9 Adjusting ST Measurement Points
10.8.9.1 About ST Point, ISO Point, and J Point
The ST deviation value for each beat is the potential 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 the
end of the QRS complex. 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.
10.8.9.2 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.
(1 ) I S O p o i n t (2 ) J po i n t ( 3 ) S T p o i n t (4 ) S T d ev i a t i o n
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