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Pacing failure due to markedly increased stimulation threshold 2 years after implantation: successful management with
Y Nagatomo1, T Ogawa, H Kumagae
1First Department of Internal Medicine, Miyazaki Medical College, Japan.
Abstract:
In a 53-year-old male who had undergone transvenous permanent pacing, intracardiac potential reduced progressively over a 2-year period and exit block developed, while the stimulation threshold was markedly increased. After oral prednisolone for 5 months, the stimulation threshold reduced gradually along with an increase in intracardiac potential, culminating in no recurrence of exit block for the ensuing 2 years. The clinical course suggests that progressive reduction in intracardiac potential may have presaged the late development of exit block, and that oral prednisolone may be a therapeutic approach for the restoration of ventricular capture even 2 years after implantation.