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Figure 1 Measurement of current of injury using the intracardiac electrogram as recorded by a Medtronic model 2290 pacing system analyzer. (A) Current of injury was hand-measured both as the increase in the duration of the intracardiac electrogram (IED) in ms and the magnitude of ST-segment elevation in mV compared to baseline at 200 mm/s. This bipolar ventricular electrogram was recorded at the time of lead fixation with development of a current of injury. (B) Ten minutes after lead fixation, with the electrogram having returned to baseline.
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