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About The St Measurement Points - Philips IntelliVue MX800 Instructions For Use Manual

Patient monitoring.
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About the ST Measurement Points

The ST value for each beat complex is the vertical difference between the ISO point and the ST point,
as shown in the diagram below. The isoelectric (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 it is a fixed
distance away from the ST point, it can be useful to help you position the ST point correctly.
CAUTION
The ST measurement points need to be adjusted when you start monitoring, and if the patient's heart
rate or ECG morphology changes significantly, as this may affect the size of the QT interval and thus
the placement of the ST point. Artifactual ST segment depression or elevation may occur if the
isoelectric point or the ST point is incorrectly set.
Always ensure that ST measurement points are appropriate for your patient.
Adjusting ST Measurement Points
Depending on your monitor's configuration, the ST point can be positioned either
relative to the J-point.
In the
can be adjusted.
or
directly by selecting a numeric value for the ST point.
In the
ST Uses
The
To adjust the ST measurement points,
1
In the
Alternatively, you can use the
Select a suitable ECG lead for ST measurement, with a visible J-point and a visible P wave. Use the
2
up and down arrow keys to scroll through the ST snippets for the other ECG leads.
Adjust ST Points
window, the pop-up keys
Adjust ST Points
window, you can adjust the ISO and ST point.
setting can only be changed in Configuration Mode.
Setup ST Analysis
menu, select
Adjust ST Points
5 ECG, Arrhythmia, ST and QT Monitoring
1
2
3
4
5
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7
8
9
ISO Point
J Point
,
Adjust ST Points
to open the
pop-up key in the
R-wave peak at 0 msec
J point, for example, 48 msec
Difference = ST value
ST measurement point, for
example, J + 60 msec
Isoelectric point set to -80 msec
P
Q
S
T
ST Point
and
are visible and
Adjust ST Points
window.
ST Baseline
window.
141

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