Key result
An appropriate implantable cardioverter-defibrillator shock caused persistent abnormalities of cellular repolarization, leading to T-wave oversensing and subsequent inappropriate shocks.
Case Report (n=1)
This case highlights that persistent abnormalities of cellular repolarization following an appropriate ICD shock can lead to T-wave oversensing and subsequent inappropriate shocks.
May prompt evaluation for post-shock repolarization changes in patients with recurrent ICD shocks; leaves open prevalence and prevention in prospective studies.
Implantable cardioverter-defibrillators (ICDs) have a considerable impact on the therapy of patients with threatening ventricular arrhythmias, significantly reducing the risk of sudden death. Even though newest devices have achieved a remarkable reliability, the delivery of inappropriate shocks is still possible. In this paper a singular case of T-wave oversensing is described, associated with a high number of inappropriate shocks and consequent rapid depletion of ICD battery. Persistent abnormalities of cellular repolarization following a first appropriate shock were believed to be at the origin of T-wave oversensing. J Med Cases. 2014;5(2):92-97 doi: http://dx.doi.org/10.14740/jmc1642w
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Campana et al. (2014) conducted a case report in T-wave oversensing and inappropriate ICD shocks (n=1). Implantable cardioverter-defibrillator (ICD) shock was evaluated on T-wave oversensing and inappropriate shocks. An appropriate implantable cardioverter-defibrillator shock caused persistent abnormalities of cellular repolarization, leading to T-wave oversensing and subsequent inappropriate shocks.
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