8-15
The ISO and ST points need to be adjusted when you start monitoring and if the patient’s
heart rate or ECG morphology changes significantly. Exceptional QRS complexes are not
considered for ST-segment analysis.
WARNING
z Always make sure that the positions of ST measurement points are appropriate for
your patient.
To adjust the ST measurement points:
1. In the [ST Analysis] menu, select [Adjust ST Point >>]. In the [Adjust ST Point]
window, three vertical lines represent the ISO, J and ST point positions respectively.
2. Select [View Leads] and use the Knob to select an ECG lead with obvious J point and R
wave.
3. Select [ISO], [J] or [ST Point] and then use the Knob to adjust the position of each
point.
 The ISO-point (isoelectric) position is given relative to the R-wave peak. Position
the ISO-point in the middle of the flattest part of the baseline (between the P and Q
waves).
 The J-point position is given relative to the R-wave peak and helps locating the
ST-point. Position the J-point at the end of the QRS complex and the beginning of
the ST segment.
 The ST-point is positioned a fixed distance from the J-point. Move the J-point to
position the ST-point at the midpoint of the ST segment. Position the ST-point
relative to the J-point at either [J+60/80ms], [J+40ms], [J+60ms] or [J+80ms].
When [J+60/80ms] is selected, the ST-point will be positioned 80 ms (heart rate
120 bpm or less) or 60 ms (heart rate more than 120 bpm) from the J-point.
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