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Updated: Aug 6, 2026

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
Published on: February 28, 2012
An "inappropriately appropriate" shock in a subcutaneous implantable cardioverter-defibrillator: The importance of
José M Rubio Campal1, Juan Benezet-Mazuecos1, Pepa Sánchez-Borque1
1Arrhythmia Unit, Cardiology Department, Fundación Jiménez Díaz - Quirón Salud, Madrid, Spain.
Abstract:
We report on a case of a 78-years-old patient with a subcutaneous implantable cardioverter defibrillator (S-ICD) and an episode of a sustained ventricular tachycardia (VT) at a rate slower than the programmed shock zone. Because of T-wave oversensing the device interpreted it as fast VT that triggered the delivery of an "inappropriately appropriate shock" that terminated it. The patient had again more VT episodes but after programming the SMART pass algorithm (previously programmed "OFF") the device showed no longer frequent T-wave oversensing and no additional inappropriate shocks occurred.
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