Proarrhythmic effect of 'reverse mode switch' in a patient with long-QT syndrome

摘要

A 44-year-old female was admitted due to appropriate ICD shock delivery after ventricular fibrillation (VF), The patient was diagnosed with long-QT syndrome (LQTS) previously and had received a dual-chamber ICD for secondary prevention (Teligen 100 F110, Boston Scientific, Natick, MA, USA).The operating mode of the ICD was reverse mode switch (RMS), with a lower rate limit set to 70 beats per minute. RMS is designed to eliminate unnecessary ventricular pacing for patients who appear to have normal atrioventricular (AV) conduction.