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Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n
227
ECG, arrhythmia, and ST segment
TruST 12-lead monitoring
This feature offers real-time assessment of 12 ST
segment deviations, with only six electrodes, which
provide eight measured ECG leads and four
derived chest leads. The derived leads are
identified by adding the letter ‘d’ before the lead
label. When TruST monitoring is activated, the V-
lead defaults to V2 and the V+ lead defaults to V5
.
Although you can select derived leads for display,
they are excluded from arrhythmia and QRS
processing.
ECG and ST reports contain the label ’d’ to identify
a derived lead.
12-lead ST monitoring
During 12-lead ST monitoring, the M540 acquires
12 ST leads in addition to the following:
– ST Vector Magnitude (
STVM)
– the magnitude
(mm or mV) of the ST vector. It is a summary
vector, combining the ST values from all 12
leads.
STVM
is trended and has its own alarm
limits.
– ST Change in Vector Magnitude (STCVM) – the
change of magnitude (mm or mV) between the
current ST vector and the ST vector at the time
of the last reference. STCVM values also show
a change in the location of the ST vector over
time.
To activate or deactivate ST monitoring
You can activate/deactivate ST monitoring at any
time as follows:
Select the heart rate parameter field to select
the
ECG
page directly.
or
1
Select
Sensor parameters...
from the main
menu bar.
2
Select the
ECG
tab to access the
ECG
page.
3
Select the
ST settings
tab.
4
Select
On
or
Off
next to
ST monitoring
.
Connecting lead sets for ST monitoring
ST monitoring uses the following lead
configurations for each available ST monitoring
mode:
– Standard ST monitoring – uses the standard 3-
5-, and 6-wire lead sets. For more information
see the diagrams starting on page 208.
– TruST – provides 12-lead ST monitoring with a
6-wire lead set (see page 201).
– 12-lead ST monitoring – uses the standard 12-
lead ECG configuration with a 6-wire lead set
plus a 4-wire lead set (see page 201).
NOTE
ST values and complexes will be missing after
discharging and entering the bedside with truST
turned on, and when ECG cable type is not set to
Auto
. You can either set the cable type to
Auto
or
unplug the ECG cable.