7ECG, Arrhythmia, ST and QT Monitoring Understanding the ST Display and Windows
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Choose a lead from the list for ST monitoring. This closes the Choices window and adds the
selected lead to the list of chosen leads.
To disable ST monitoring for a lead:
1 Choose a lead from the list in the Setup ST Leads window.
2 Select the Delete key. This removes this lead from the list.
NOTE The order in which ST leads are listed in the Setup ST Leads menu determines the order in which ST
leads are displayed on the monitor screen.
To change the order in which ST leads are displayed,
1 In the Setup ST Leads menu, choose a lead from the list.
2 Select the Sort Up or Sort Down key to move the lead up or down in the list.
Understanding the ST Display and Windows
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 Setup ST Analysis -> Setup ST Leads list. 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 STindx numeric will display a question mark “?”.
♦ To s w i t c h t h e S T i nd e x nu me ri c o n o r of f fo r d is p lay, i n t h e Setup ST Analysis menu,
select ST-Index to toggle between On and Off.
1ST numerics
2Current HR alarm limits
3Current heart rate
ST-II 1.2
ST-V 2.5
ST-aVR -3.0
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