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10-21
Mortara algorithm package
To adjust the points:
1. Select DEF POINT >> in the ST ANALYSIS menu to open the following window. Three
vertical cursors indicate the positions of the ISO, J and ST points.
Figure 10-15 ST Measurement Point
2. Select VIEW LEADS option, and then rotate the knob to select a suitable ECG lead for ST
measurement, with a visible J-point and a visible P wave.
3. Select ISO, J or ST option, and then rotate the knob to adjust the position of each point
respectively.
The ISO-point cursor positions the isoelectric point 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 or in front of the P wave).
The J-point cursor postions the J-point relative to the R-wave peak. It helps to correctly
position 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, either J+60 or J+80. Move
the J-point cursor to position the ST-point at the midpoint of the ST segment.
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