5 ECG, Arrhythmia, ST and QT Monitoring
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Understanding the ST Display
Your monitor screen may be configured to look slightly different from the illustrations.
ST Numerics
Up to 12 ST numerics plus the ST index can be displayed on the monitor screen. They can be
configured to show beside the measurement numerics, beside the ECG wave, or beside the ST snippet.
A positive ST value indicates ST segment elevation; a negative value indicates depression.
ST numerics are displayed in the order in which you select ST leads for analysis. If there is additional
space in the field assigned to ST numerics, the monitor will display extra numerics in the order in
which they appear in the list in
Setup ST Leads, in the Setup ST Analysis menu. Any ST leads
switched on for analysis that do not fit in the assigned numerics field are shown in succession in place
of the last ST numeric.
ST Index
The ST index numeric (
STindx) is the sum of the absolute values for the ST leads V2, V5, aVF.
Because it is based on absolute values, it is always a positive number. If you haven't selected one of the
leads V2, V5, and aVF for ST analysis, the ST index numeric will display a question mark "?".
To switch the ST index numeric on or off for display, in the
Setup ST Analysis menu, select ST-Index
to toggle between
On and Off.
ST Snippets
ST snippets show a one second wave segment for each measured ST lead. The most recent snippet is
drawn in the same color as the ECG wave, usually green, superimposed over the stored baseline
snippet, drawn in a different color. The comparison shows any deviation in the measurement since the
baseline snippet was stored, for example as a result of a procedure carried out on the patient.The
information is updated once per minute.
If you do not see ST snippets on the Screen, select the Screen name in the Monitor Info Line and
select a Screen configured to show snippets from the pop-up list of available Screens.
ST Baseline Window
The ST Baseline Window shows an ST snippet drawn on a grid. The current ST numeric and the ST
numeric stored with the baseline are shown, as well as the difference between these two numerics.
A "?" in front of the difference numeric indicates that the ST measurement points were adjusted since
the baseline snippet was stored.
The Baseline Window opens with the ST pop-up keys
Update Baseline, Record ST, Change ST Lead,
Adjust ST Points, ST Map and arrow keys for scrolling through the available leads.
To view the
ST Baseline window, select any snippet on the Screen.
1 ST numerics
2 Current HR alarm limits
3 Current heart rate
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