ST/AR ST Segment Algorithm
7-10 ST/AR Arrhythmia Monitoring
• You are unable to get any lead that is not noisy.
• Arrhythmias such as atrial fib/flutter cause irregular baseline.
• The patient is continuously ventricularly paced.
• The patient has left bundle branch block.
Adjusting ST
Measurement
Points
The ST Setup Window enables you to adjust the ST measurement points to
ensure accurate data.
There are three measurement cursors:
• The ISO measurement cursor positions the isoelectric point in relation to
the R-wave peak.
• The J-point cursor positions the J-point in relation to the R-wave peak.
The purpose of the J-point is to correctly position the ST measurement
point.
• The ST measurement cursor positions the ST point a fixed distance from
the J point.
Note—The ST measurement points may need to be re-adjusted if the patient's
heart rate or ECG morphology changes significantly.
Perform the following steps at the Information Center to adjust the ST
measurement points:
Step
Action
1 Access the ST Setup window by clicking on the All Controls button
in the Patient Window, then clicking on the ST Setup button.
2 If you need to adjust the ISO (isoelectric) point, place the cursor
over the ISO button to access the adjustment arrows. Then use the
arrows to position the bar in the middle of the flattest part of the
baseline (between the P and Q waves or in front of the P wave).
T
R
P
ISO
point
Q
S
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