Current of injury predicts adequate active lead fixation in permanent pacemaker/defibrillation leads
Sherry J. Saxonhouse, MD*,
Jamie B. Conti, MD, FACC and
Anne B. Curtis, MD, FACC
Department of Medicine, Division of Cardiovascular Medicine, University of Florida College of Medicine, Gainesville, Florida
View larger version (27K):
[in a new window]
|
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.
|
|
View larger version (13K):
[in a new window]
|
Figure 2 Ventricular lead without a current of injury at the time of fixation. Lead dislodgement occurred after eight minutes from the time of fixation.
|
|
View larger version (23K):
[in a new window]
|
Figure 3 Atrial electrogram recorded at baseline (A) and at the time of fixation (B), illustrating a current of injury with prolongation of the intracardiac electrogram and ST-segment elevation.
|
|
|
