ST Segment Analysis
VF4 Infinity Gamma Series Page 10-3
ST Monitoring Display
The monitor performs the ST segment analy-
sis on the two leads selected for ECG moni-
toring. If the ECG leads monitored are not
currently displayed, the monitor processes
the signal on the last ECG lead(s) selected.
When the ST option is enabled, and the mon-
itor is set for adult or pediatric monitoring mode, the ST1 and
ST2 values are continuously displayed in the ST parameter box.
However, the number of ST leads displayed changes according to
the ECG lead configuration selected. With a 3-lead monitoring
configuration, for example, the ST parameter box shows only one
ST value. Configurations with more than 3 leads produce ST1
and ST2 values, even if only one ECG waveform is displayed on
screen.
If the first and second waveform channels display ECG leads, the
ST parameter box appears next to the second waveform channel.
If only the first waveform channel displays an ECG lead, the ST
parameter box appears at the bottom of the screen.
If ST1 or ST2 alarm limits are disabled, a crossed bell appears
next to the corresponding ST value. When ST alarms are on and
an ST value goes above or below the user-defined limits, the ST
parameter box flashes and the alarm message appears at the bot-
tom of the display. If the monitor detects another alarm simulta-
neously (for example, an ST and an SpO
2
alarm), it reports both
events (see the chapter Alarms and Messages for details).
When you change an ST lead and it is no longer displayed on
screen, the trended values for the old lead stay in the trend mem-
ory.
NOTE: When the monitor uses the Export Protocol to communi-
cate with an external device, ST values are rounded to the nearest
millimeter (or millivolt) and transmitted as whole numbers. For
example, a value of 1.7 mm is transmitted as 2 mm.
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