8-10 Passport 12/Passport 8 Operator’s Manual
8.6 About ST Monitoring
ST segment analysis is not intended for neonatal patients.
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 deviation: mV or mm. You can set the unit in the [Unit Setup] menu from the
[User Maintenance] menu.
Measurement range of the ST segment deviation: -2.0 mV to +2.0 mV.
NOTE
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 Monitoring On and Off
To switch ST monitoring on or off:
1. In the [ECG Setup] menu, select [ST Analysis >>].
2. Select [ST Analysis] and then select [On] or [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. If you change
[Monitor] or [Surgery] to [Diagnostic] or [ST], ST-segment analysis remains off, you can turn it on manually.
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