User's Manual

ST/AR ST Analysis Algorithm
6-38 ECG and Arrhythmia Monitoring
The Measurements
Overview
The ST/STE measurement for each beat complex is the vertical difference
between two measurement points. The isoelectric point provides the
baseline for both measurements.
The ST measurement uses the isoelectric point and the ST point. The ST
point is positioned with reference to the J-point.
The STE measurement uses the isoelectric point and the J point.
1. R-wave peak at 0 msec
2. J point
3. Difference = ST value
4. ST measurement point. Default = J+60 msec
5. Isoelectric point. Default = -80 msec
6. P
7. Q
8. S
9. T
You can manually adjust the ST/STE measurements on the Information
Center's Measurements application.
Turning ST or STE On and Off
ST and STE analysis can be turned on and off independently. You would
turn ST/STE monitoring off if:
 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.
 To turn all ST or STE monitoring on or off at the
IntelliVue Information Center iX:
1 Select the Measurements ST page.
2 Click the I/O ST or I/O STE Analysis button to toggle ST or STE
Analysis on or off as appropriate.