User's Manual

Table Of Contents
5 ECG, Arrhythmia, ST and QT Monitoring
112
the normal QRS complex should be either completely above or below the baseline and it should
not be biphasic. For paced patients, the QRS complexes should be at least twice the height of pace
pulses.
the QRS complex should be tall and narrow
the P-waves and the T-waves should be less than 0.2 mV.
For ease of identification on the screen, the pacer spikes can be configured to have a fixed size. They
are then shown in the background as a dotted lines. The length of the dotted line is fixed to the wave
channel height and is independent of the actual pacer amplitude.
Setting the Paced Status (Pace Pulse Rejection)
Avoiding Pace Pulse Repolarization Tails
Some unipolar pacemakers display pace pulses with repolarization tails. These tails may be counted as
QRSs in the event of cardiac arrest or other arrhythmias.
If you note a visible repolarization tail, choose a lead that decreases the size of the repolarization tail.
Changing the Size of the ECG Wave
If any of the displayed ECG waves is too small or clipped, you can change the size of one or all of the
ECG waves on the screen.
In the
Setup ECG menu, select Paced to toggle between Yes and No.
You can also change the paced status in the Patient Demographics window.
When
Paced is set to Yes:
Pace Pulse Rejection is switched on. This means that pacemaker
pulses are not counted as extra QRS complexes.
pace pulse marks are shown on the ECG wave as a small dash (only
when the pacer spikes are not configured to have a fixed size).
The paced symbol is displayed on the main screen.
When
Paced is set to No, pacer spikes are not shown in the ECG wave. Be
aware that switching pace pulse rejection off for paced patients may result in
pace pulses being counted as regular QRS complexes, which could prevent an
asystole event from being detected.
Paced
Non-Paced
1 Repolarization tail (note width)