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Stored atrial (top trace) and ventricular (bottom trace) EGM demonstrating an atrial tachycardia sensed appropriately (AS) and traced to the ventricles at the upper tracking rate (VP-MT). Pseudo-Wenckebach behaviour is seen at VP-MT with AS events not conducted to the ventricles, (denoted as (AS)). Towards the end of this trace, the atrial rate is sensed as exceeding the automatic mode switch rate (ATR—FB) triggering fall back ventricular pacing (VP-FB)
