ST Analysis (Optional) ECG Monitoring
4 - 32 0070- 0-0704-02 Passport V Operating Instructions
4.9.2.1 Adjusting the ISO and J/ST Point
1. Open the ST Menu by using the Navigator Knob to select the ST parameter heading.
ST Menu can also be accessed through the ECG Menu.
2. Ensure the ST Analysis selection in the ST Menu is On. The Passport V will learn
the patient's QRS complexes (one for a 3-lead leadset or 3 for a 5-lead leadset). These
learned complexes will appear in the ST Menu with the monitor-selected ISO and J/ST
points displayed.
3. Scroll to the ISO selection to adjust the isoelectric point on the learned QRS complex.
The isoelectric point is the area of the QRS complex following the P-wave and before the
start of the Q-wave.
4. Adjust the ISO point by pressing the Navigator Knob and turning to adjust the white
ISO reference line. Press the Navigator Knob when the ISO point is satisfactory.
5. Scroll to the J/ST point heading. Adjust the J/ST point by pressing the Navigator Knob
and turning to adjust the orange and green J/ST reference lines. Press the Navigator
Knob when the J/ST points are satisfactory.
6. To adjust the ST-pt, scroll to the ST-pt heading and press the Navigator Knob to display
a list of ST measurement point settings. Select the appropriate setting, then press the
Navigator Knob when the ST-pt choice is satisfactory.
4.9.2.2 Adjusting ST Measurement Points
ST measurement points refer to ISO point (isoelectric reference point) and ST point. The
Mortara algorithm uses the J+X method to position the ST point, which is located at X position
on the right of J point.
The following table describes the range of ST measurement points and their steps.
ST-pt is set to 60 or 80ms from the J point. When HR is greater than 120 bpm, the distance
between ST point and J point is set at 60ms; when HR is lower or equal to 120 bpm, the
distance between ST point and J point is set at 80ms.
POINT OPTION/RANGE STEP
ISO -200 to -4ms 8ms
J/ST 4 to 200ms 8ms
ST-pt 40ms, 60ms, 80ms,
60/80ms
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