Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n
199
ECG, arrhythmia, and ST segment
Overview of ECG and heart rate monitoring
The M540 calculates and displays the heart rate,
identifies paced beats, reports arrhythmia
conditions, measures ST deviations, and relays
these values to the Cockpit for display. ECG and
heart rate monitoring is for adult, pediatric, and
neonatal patients.
3-, 5-, 6-, and 10-wire lead sets are available for
adult and pediatric ECG monitoring (including
TruST). A neonatal ECG adapter cable is available
for connecting individual ECG leads for neonatal
monitoring.
Normal ECG monitoring (including 12-lead ECG
monitoring) is not of diagnostic quality. The only
report of diagnostic quality is an optional Rest ECG
report which is generated from a 12-lead ECG. To
generate such a report requires that the patient is
admitted at the Infinity CentralStation and that the
Rest ECG option is activated (see page 469 for
setup information).
Refer to the instructions for use
Infinity Acute Care
System – Infinity M540
for a detailed description of
the M540 ECG functions.
The ECG monitoring functions are configurable in
the ECG pages (see page 212).
Before performing any monitoring functions, refer
to the section “For your safety and that of your
patients“on page 13.
ECG signal processing and display
The M540 identifies QRS complexes of certain
amplitudes and QRS widths for adult, pediatric, and
neonatal patients (see the ECG section of the
“Technical data“chapter in the M540 instructions for
use for detailed parameter specifications). It
calculates heart rates within a range of 15 beats to
300 beats per minute, using the R-R intervals of the
last 10 seconds. This calculation excludes the two
longest and the two shortest R-R intervals. The
M540 averages the remaining intervals and
displays the result as the current heart rate in the
heart rate parameter field. For adult and pediatric
patients, the QRS threshold is adjustable (see
page 215).
During dual-channel processing, a weight is
assigned to each channel depending on its level of
artifact. The channel with less artifact always
receives the greater weight. When a channel
exceeds a certain level of artifact, it is excluded
from the composite signal, and the M540 shifts to
single-channel processing. If both channels
experience excessive artifact, an artifact message
appears until at least one channel is sufficiently free
of artifact.
During artifact, asterisks (* * *) replace the heart
rate value. Once the artifact clears, QRS
processing resumes without initiating a relearning
phase.
Arrhythmia monitoring and the selected arrhythmia
mode affect the display of the heart rate parameter
field. For detailed information, see “Arrhythmia
processing“on page 221.
Parameter-specific error messages are listed in the
chapter “Troubleshooting“starting on page 509.
Supported parameters
– ECG: HR (heart rate), %PACED (paced beats)
– ST: STI, STII, STIII, STaVR, STaVL, STaVF,
STV, STV+, STV1 to STV6, STVM, STCVM,
STdV1, STdV3, STdV4, STdV6
– Arrhythmia: ARR (ASY, VF, ARTF, VTACH,
RUN, AIVR, SVT, CPT, BGM, TACH, BRADY,
Pause); see page 221 for a description of these
arrhythmia modes and PVC/min
In addition to stored events, the two high priority
alarms ASY and VF are also stored and displayed
in the ICS trends.
