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.