Key result
The capture threshold of a Micra leadless pacemaker increased substantially at slower pacing rates (2.5 V at 60 bpm) compared to faster rates (0.5 V at 100 bpm) in a 98-year-old man.
Case Report (n=1)
No
May warrant rate-specific threshold checks after Micra implantation; single case leaves prevalence and relevance open.
Implantation of a conventional transvenous cardiac pacemaker has historically been the standard of care for patients with symptomatic bradycardia or high-degree atrioventricular (AV) block.1 Capture threshold, lead impedance, and sensing voltage amplitude are essential parameters to assess and predict conventional pacemaker lead performance during the initial implantation procedure and for long-term follow-up.2,3 Recently developed leadless pacemakers such as the Micra AV and VR systems (Medtronic Inc, Minneapolis, MN) have unique advantages over conventional transvenous cardiac devices and have been implanted in suitable patients for the past 5–6 years.
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Nusbickel et al. (2021) conducted a case report in Second-degree type 2 AV block with syncope (n=1). Micra AV leadless pacemaker was evaluated on Capture threshold at different pacing rates. The capture threshold of a Micra leadless pacemaker increased substantially at slower pacing rates (2.5 V at 60 bpm) compared to faster rates (0.5 V at 100 bpm) in a 98-year-old man.
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