Dissimilar ventricular rhythms: Implications for ICD therapy

Inhibition of Left Ventricular Pacing during Cardiac Resynchronization

“…The potential advantages of LV sensing should be balanced against the limits of the algorithm and its complex manifestations that may not be universally recognized. LV sensing may become more important in the future as more manufacturers offer it in their CRT devices because the LV channel can provide useful diagnostic data as highlighted recently by the demonstration of dissimilar ventricular tachyarrhythmias involving the RV and LV . The wider use of CRT devices with LV sensing would require a thorough understanding of complex timing cycles for the interpretation of arrhythmias recorded by the LV channel.…”

Inhibition of left ventricular stimulation due to left ventricular lead failure and the left ventricular T‐wave protection algorithm in patient with cardiac resynchronization therapy and pacemaker dependency

“…This feature is referred to as LVTP in Biotronik devices and Left Ventricular Protection Period (LVPP) in Boston Scientific devices. Furthermore, LV sensing can provide useful diagnostic data and permit the diagnosis of dissimilar ventricular rhythms or tachyarrhythmias involving the RV and LV (Barold et al., ).…”

Undetected ventricular fibrillation in a single-chamber implantable cardioverter-defibrillator: When the far-field channel sees more than the intraventricular channel

“…In the present case we can only speculate because a single-chamber ICD does not provide left ventricular (LV) electrograms, as would be available in an ICD with resynchronization therapy (cardiac resynchronization therapy defibrillator; CRT-D). The observations of dissimilar ventricular tachycardia (VT) rhythms (dissociated RV and LV rhythms) and the implications for ICD detection were described by Barold et al 3 …”