SpringerImages - Surface ECG leads and consecutive unipolar virtual electrograms of epicardial origin are shown in this recording: note that the amplifier gain value was set above the clipping level to preserve components of very low amplitude

Surface ECG leads and consecutive unipolar virtual electrograms of epicardial origin are shown in this recording: note that the amplifier gain value was set above the clipping level to preserve components of very low amplitude

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Fig 8

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A representative example of virtual waveforms from a train of five consecutive beats of subepicardial origin is shown in Fig. 8 , revealing the appearance of initial R waves and Q-S morphologies simultaneously: Whereas the first beat shows prominent tall and narrow R waves in each virtual electrogram, the second and fourth electrogram show almost none.

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