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8.6 About ST Monitoring
 ST segment analysis calculates ST segment elevations and depressions for individual
leads and then displays them as numerics in the ST1 and ST2 areas.
 A positive value indicates ST segment elevation; a negative value indicates ST segment
depression.
 Measurement unit of the ST segment: mV or mm. You can set the unit in the [Unit
Setup] menu from the [User Maintenance] menu.
 Measurement range of the ST segment: -2.0 mV to +2.0 mV.
WARNING
z The ST algorithm has been tested for accuracy of the ST segment data. The
significance of the ST segment changes need to be determined by a clinician.
8.6.1 Switching ST On and Off
To switch ST monitoring on or off:
1. In the [ECG Setup] menu, select [ST Analysis >>].
2. Select [ST Analysis] to toggle between [On] and [Off].
Reliable ST monitoring can hardly be ensured if:
 You are unable to get a 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.
In these cases, you may consider switching ST monitoring off.
8.6.2 Changing ST Filter Settings
ST-segment analysis can be carried out only when the filter mode is set to [Diagnostic] or
[ST]. When ST-segment analysis is switched on, [Filter] will automatically switch to [ST] if
it is not [Diagnostic] or [ST]. When ST-segment analysis is switched off, the filter mode
automatically switches to previous manual setting.
However, if you switch [Filter] to [Monitor] or [Surgery], ST-segment analysis will turn off
automatically. In case that you change [Monitor] or [Surgery] to [Diagnostic] or [ST],
ST-segment analysis keeps off, you can turn it on manually.
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