CONCLUSIONS
The pacing threshold increased shortly after Micra-TPS implantation due to micro-dislodgement of the device because of insufficient anchoring of the device to the myocardium. Our results suggest that if an early threshold increase can be avoided after implantation, a stable threshold can be potentially reached in the medium-to-long term. When implanting the Micra-TPS, we showed that impedance >660 Ω and threshold <1.0 V/0.24 msec may be good indicators that the device is sufficiently anchored to the myocardium. We intend to evaluate the increase in the threshold by assessing implant impedance in a further study.