Key result
High voltage unipolar electrograms during bipolar demand ventricular pacing do not guarantee adequate QRS signal delivery to the pacemaker, which depends on the potential difference between electrodes.
Case Report (n=2)
In bipolar pacing systems, adequate QRS signal delivery depends on the potential difference between the two intracardiac electrodes, which should be measured directly rather than relying on unipolar electrograms.
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Direct bipolar electrogram measurement may be warranted in pacing troubleshooting; leaves open whether unipolar voltages suffice beyond this case.
S. Serge Barold (1971) conducted a case report in Pacemaker failure during bipolar demand ventricular pacing (n=2). Bipolar demand ventricular pacing was evaluated on Delivery of adequate QRS signal to the pacemaker. High voltage unipolar electrograms during bipolar demand ventricular pacing do not guarantee adequate QRS signal delivery to the pacemaker, which depends on the potential difference between electrodes.
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