Double‐device therapy in a patient with long QT syndrome

A 26‐year‐old man with long QT syndrome (LQTS) underwent subcutaneous implantable cardioverter‐defibrillator (S‐ICD) implantation. The patient exhibited sinus bradycardia relative to his age. The heart rate decreased, and the QT interval became longer with the administration of β‐blockers, the first‐line therapy for LQTS. The patient experienced frequent S‐ICD discharges. Subsequently, a single‐chamber pacemaker was implanted, and the 12‐lead electrocardiogram showed atrial pacing and ventricular sensing at 60 beats per minute with a shorter QTc interval. After converting to “double‐device therapy,” the patient did not experience any ventricular arrhythmia events.