The difference in the number of complications is not significant between both systems. Long-term stability in epicardial systems, though it may seem different, is similar to that of endocardial systems. After the first six weeks, late displacements are remarkable and they can rarely be related to a specific event. Early lead displacements are the most frequent cause of reintervention, involving atrial leads in the majority of cases. These values are higher in biventricular pacing devices, related to coronary sinus lead displacement. Acceptable displacement rates should probably be less than 1 percent for ventricular leads and no more than 2 to 3 percent for atrial leads. The incidence of early displacements is 1% in VVI pacemakers and 5.2% in DDD pacemakers (3.8% of the cases affecting atrial leads and 1.4% ventricular leads). Early displacements are more frequent than late displacements and they usually affect atrial leads. Chronologically speaking, there are early displacements, which occur within the first six weeks after implantation, and late displacements, after this period of time.

However, only those displacements that provoke a malfunction in the pacing system are clinically relevant. Pacemaker lead displacements can be defined as any other pacemaker position change, whether the functionality of the pacemaker is affected or not.

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