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If an unacceptable HIGH lead impedance is observed, performing x-rays (anteroposterior and lateral views) may help to confirm a lead breakage. Additionally, EMG recording equipment can be used to analyse the VNS stimulus waveform from the neck for verification of an electrical discontinuity. A differentiated VNS waveform with narrowed pulses or no waveform at all can confirm lead discontinuity. This Technical Note describes an easy but underused electrophysiological procedure to be included in the standardized protocol for identifying VN
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