7 ECG, Arrhythmia, ST and QT Monitoring Selecting the Primary and Secondary ECG Leads
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Selecting the Primary and Secondary ECG Leads
The monitor uses the primary and secondary lead to compute HR and to analyze and detect cardiac
arrhythmias. They are also available for recordings and for display on the Information Center.
The secondary lead is only used if your monitor is configured for multi-lead (instead of single-lead)
arrhythmia analysis.
To select a lead as primary or secondary lead:
♦ In the Setup ECG menu, select Primary Lead or Secondary Lead, then select the
appropriate lead. You can assign any available lead whether it is currently displayed or not.
Checking Paced Status
It is important to set the paced status correctly when you start monitoring ECG.
♦ To change the paced status in the Setup ECG menu, select Paced to toggle between Yes or
No.
WARNING Pace pulse rejection must be switched on for paced patients by setting “Paced” to Yes. 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. When changing profiles, and at
admission/discharge, always check that paced status is correct for the patient.
Some pace pulses can be difficult to reject. When this happens, the pulses are counted as a QRS
complex, and could result in an incorrect HR and failure to detect cardiac arrest or some arrhythmias.
Make sure that pace pulses are detected correctly by checking the pace pulse markers on the display.
Keep pacemaker patients under close observation.
Understanding the ECG Display
Your display may be configured to look slightly different.
You should choose a lead as primary or secondary lead that
has the following characteristics:
• the QRS complex should be either completely above or
below the baseline and it should not be biphasic
• the QRS complex should be tall and narrow
• the P-waves and T-waves should be less than 0.2 mV
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