Mindray Passport 8 Operator's Manual

Passport 12/Passport 8 Operator’s Manual 8-13
8.6.10 Adjusting ST Measurement Points
As shown in the figure below, the ST measured for each beat complex is the vertical difference between two
measurement points with the R-wave peak as the baseline for the measurement.
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
 Always ensure that the ST measurement points are appropriate for your patient.
To adjust the ST measurement points:
1. Select the ECG numeric area or waveform area to enter the [ECG Setup] menu.
2. Select [ST Analysis >>].
3. Set [ST Analysis] to [On].
4. Select [Adjust ST Point >>].
In the [Adjust ST Point] window, three vertical lines represent the ISO, J and ST point positions respectively. In this
window, you can:
 Select [Auto] to automatically detect the ISO point and J point, and set ST point. When [Auto] is selected, the
monitor takes a few seconds to finish automatic detection. During this time, the message [Please wait...] is
displayed in the [Adjust ST Point] window.
 Or manually adjust the ISO point, J point, and ST point.
To manually adjust the ST measurement points, follow this procedure:
1. Use the left and right arrows beside [ISO] and [J] to adjust the position of ISO point and J 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.
2. Set [ST Point]. 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.
R-wave peak
P point
ISO electric point
ST measurement point
Difference=ST value
J point
Q

Mindray Passport 8 Specifications

General

Brand	Mindray
Model	Passport 8
Category	Medical Equipment
Language	English