Implantation of the Micra AV pacemaker in a patient with acquired long QT syndrome resulted in postoperative torsades de pointes secondary to pacing pauses from the Tracking Check algorithm.
Case Report (n=1)
The Tracking Check algorithm in the Micra AV leadless pacemaker can induce pauses that may trigger torsades de pointes in patients with acquired long QT syndrome.
The Medtronic Micra AV leadless pacemaker (Medtronic, Minneapolis, MN) was designed to provide atrioventricular (AV) synchronous pacing in patients with preserved sinus node function and AV block.1,2 A proprietary, downloaded feature termed “Tracking Check” is intended to prevent premature ventricular pacing or pacing at a rate in excess of the sinus cycle length. Implementation of this algorithm requires cessation of pacing. In this case report we describe a patient with acquired long QT syndrome (LQTS) that underwent implantation of the Micra AV pacemaker and developed torsades de pointes (TdP) postoperatively secondary to such pauses.
Burkman et al. (Thu,) conducted a case report in Acquired long QT syndrome (LQTS) (n=1). Medtronic Micra AV leadless pacemaker was evaluated on Development of torsades de pointes (TdP). Implantation of the Micra AV pacemaker in a patient with acquired long QT syndrome resulted in postoperative torsades de pointes secondary to pacing pauses from the Tracking Check algorithm.