No abstract

(Cardiol J 2014; 21, 4: 343-349)

y diagnostic tests were performed. Four months later, he was admitted because of a collapse. The ECG at presentation is shown in Fig. 2. What is your diagnosis, and what does it tell you about the possible pre-excitation? Answer You will find the answer elsewhere in this issue.

A 74‐year‐old man with a dual‐chamber implantable cardioverter defibrillator implanted 3 years before experienced multiple ventricular tachycardias (VTs). All episodes were initiated by pacemaker‐mediated tachycardia (PMT) that was either stopped by atrial undersensing or the tachycardia termination algorithm of the device. After the termination of PMT, two rapid ventricular paced beats, the first initiated by artificial triggering and the second due to retrograde conduction of the first one, initiated VT that was successfully terminated by antitachycardia pacing or a direct current shock of the device . All episodes revealed this pattern of initiation with a short‐long‐short ventricular sequence inducing VT.