ECG, arrhythmia, and ST segment
216
Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n
Monitoring paced patients
When pacer detection is activated, the M540 uses
the following specifications to identify a pulse as a
pacer pulse:
Amplitude (ap):
±
2 to
±
700 mV
Width (dp): 0.2 to 2.0 ms
Rise/Fall times (min): 0.1 dp, 100 ms
Overshoot (min): 0.025 ap, 2 mV
Recharge time constant: 4 to 100 ms
If a QRS complex occurs within 250 ms of a pacer
impulse, it is also considered a paced beat. A
paced beat is identified as followed:
– In the heart rate parameter field, the letter ’P’
appears next to the flashing heart symbol when
a pacer pulse is detected.
– On the ECG waveform, blue spikes appear to
identify pacer spikes.
When pacer detection is deactivated, the message
Pacer off
,
appears in the top ECG channel.
To optimize pacer monitoring, follow the guidelines
on page 219.
To activate/deactivate pacer detection
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
Settings 2
tab.
4
Select
On
next to
Pacer detection
.
NOTE
Pacemaker pulse recognition and rejection is not
behaving as expected in pediatric mode under
both clinically unlikely conditions:
- when the pacer pulse falls 10 ms before the end
of the QRS complex, and QRS width is between
60 to 120 ms, then the QRS complex will not be
classified as a paced beat.
- when the pacer pulse falls 50 ms after the end of
the QRS complex, and QRS width is 40 ms, then
the QRS complex will not be classified as a
non-paced beat.
