S10/S12/S10A/S12A Patient Monitor User’s Manual
8-23
1. Select ECG parameter area, waveform area, ST parameter area or ST
waveform area to enter 【ECG】 menu.
2. Select 【ST】 submenu【Setting】submenu.
3. Switch on 【ST Mark】.
8.7.9. Adjusting ST Measurement Point
8.7.9.1. 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.
(1) ISO Baseline Point (2) J Point (3)ST Measurement Point (4) ST Value
8.7.9.2. Setting ST Point, J Point and ISO Point
CAUTION：
When you start monitoring or the patient's heart rate or ECG waveform has
obvious changes, it may affect the length of QT interval, thus affecting the
position of ST points, so the positions of ISO and ST points need to be adjusted.
Incorrect setting of ISO point or ST point may lead to false ST segment
depression or elevation. Please always ensure that the location of ST
measurement point is suitable for the patients under monitoring.
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