6 ECG, Arrhythmia, ST and QT Monitoring
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1
In the Setup ST Analysis menu, select the alarm to be adjusted.
2 Select the appropriate setting.
STE Alarms
The STE alarm is a yellow alarm. It can be switched on and off in the Setup ST Elevation menu but the
limits can only be changed in Configuration mode. The STE alarm limits are gender specific and can
be set individually for limb leads, V2/V3 leads, V1/V4/V5/V6 leads, V7/V8/V9 leads and V3R, V4R,
V5R, V6R leads. The default values, for example on V2 and V3 1.5 mm for females and 2.0 mm for
males, are based on the recommendations from the American Heart Association and American
College of Cardiology.
The ST Elevation measurements with automated J-point determination generate ST Elevation alarms,
in addition to the ST measurements at the user-defined ST point (J+offset), which may be useful for
ST depression alarms. When ST and STE analysis are both in use, this may result in redundant alarms
for ST elevations. Because of the different measurement points, there may be different values
obtained. Thus there could be an ST alarm and an STE alarm but the STE alarm may announce sooner
based upon the values obtained.
Viewing ST Maps
The monitor can derive a multi-axis portrait (map) from the ST analysis to help you detect changes in
ST values. Two planes obtained from a multi-lead ECG are displayed in a multi-axis diagram, where
each axis represents a lead. The value at the ST point is given. The position of the axes within the
diagram correspond to the placement of the ECG leads. Each ST value is assigned to either a limb
lead, or to a chest lead. Every axis shows the polarity of the lead it represents. By joining adjacent ST
values, the monitor obtains an ST map. The contour line and the map shading are shown in the same
color as the ECG parameter.
Viewing an ST Map
To display an ST map,
•In the
Main Setup menu, select ST Map.
Current View
In current view, the monitor displays an ST map that corresponds to the current ST values.
The left of the following diagrams shows leads I, II, III, aVR, aVL, and aVF on the limb leads plane.
On the right, the V-leads V1, V2, V3, V4, V5, V6 (and V7, V8, V9, V3R, V4R, V5R, V6R, if
configured) are on the chest leads plane.
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