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Demand Mode Versus Fixed Mode - Philips HeartStart MRxM3536A Instructions For Use Manual

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7 Noninvasive Pacing
A white pacing marker appears on the ECG waveform in Wave Sector 1 each time a pacer pulse is
delivered to the patient. If pacing in demand mode, white R-wave markers also appear on the ECG
until capture occurs.
R-wave markers do not appear on paced beats.
N O T E

Demand Mode Versus Fixed Mode

The HeartStart MRx can deliver paced pulses in either demand or fixed mode.
• In demand mode, the pacer only delivers paced pulses when the patient's heart rate is lower than the
selected pacing rate.
• In fixed mode, the pacer delivers paced pulses at the selected rate.
Use demand mode pacing whenever possible. Use fixed mode pacing when motion artifact or other
WARNING
ECG noise makes R-wave detection unreliable or when monitoring electrodes are not available.
The HeartStart MRx requires a 3-, 5-, or 10-lead ECG cable and monitoring electrodes as the source of
the ECG during demand pacing. Pace pulses are delivered through the multifunction electrode pads.
However, the pads cannot be used to monitor the ECG and deliver pace pulses simultaneously.
The ECG derived from pads does not need to be displayed in a wave sector in order to deliver pacing
N O T E
therapy.
N O T E
When using demand mode, pads are not an available choice for display in Wave Sector 1, through
either the Lead Select button or the Displayed Waves menu.
86
Demand Mode Versus Fixed Mode

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