After‐Potential Oversensing by a Programmable Puise Generator

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Abstract
Oversensing and recycling due to pacemaker stimulus after‐potentials are recognized complications of non‐competitive pacing. Often mas‐querading as T‐wave sensing, after‐potential oversensing may result in slowing or acceleration of pacing rate. We report two cases of after‐potential oversensing in po‐tients with R‐wave inhibited (VVI) programmable pulse generators. In both coses, recycling of the pulse generators by the sensed after‐potentials resuited in slowing of the pacing rates. This phenomenon was abolished non‐invasively by decreasing the duration or width of the stimulus pulse which diminished the magnitude of the after‐potential signal.