Chest X‐ray showing the position of the defibrillator lead at a high septal position far away from the exit site of the tachycardia (red asterisk). A red asterisk illustrates the exit of the ventricular tachycardia circuit on the cardiac silhouette. The dotted red line refers to the distance the electrical impulse covers from the exit site till being sensed by the tip of the defibrillator lead. This propagation time is prolonged and in the meanwhile sensed AV interval has expired. As a result, ventricular pacing ensues despite QRS onset