St Detection - GE B20 User Manual

ST Detection

The monitor analyzes ST for all measured leads and displays ST
trends separately for each lead. ST analysis starts automatically
after the leads have been connected and the QRS detection has
started.
ST is displayed as digits and trends. For more information about
detection performance and test results of ST segment measurement
algorithm testing, see the "User's Reference Manual: ECG."
NOTE: ST segment changes may be affected by some drugs or
metabolic and conduction disturbances.
NOTE: The significance of the ST segment changes needs to be
determined by a physician.
Adjusting the measurement points
Automatically selecting ST measurement points
The ST algorithm automatically searches for the J and ISO points.
The distance between the ST and J point is set according to the
heart rate:
• If the heart rate is less than 120 bpm, the ST point is set at J +
80 ms.
• If the heart rate is more than or equal to 120 bpm, the ST
point is set at J + 60 ms.
Manually adjusting ST measurement points
The J, ISO and ST measurement points can also be selected
manually. If any the measurement points are manually selected, the
other two measurement points are set to the current values.
ECG
1. Press the key
2. Select Adjust ST.
3. Select Set ISO point, Set J point or ST point (where the value is
the delay between J-point and ST-point in milliseconds).
Adjusting the ST alarms
ECG
1. Press the key.
2. Select ECG Alarms - ST Alarms.
• To set up the limits, select Adjust Limits.
• To OFF/ON the lateral limits, select Lat. Alarm.
• To OFF/ON the inferior limits, select Inf. Alarm.
• To OFF/ON the anterior limits, select Ant. Alarm.
3. You can also select Alarms Setup to adjust ST or related alarms.
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