Key result
Lower implant impedance (582 vs 755 Ω, P<0.001) and higher implant thresholds (1.29 vs 0.71 V, P=0.014) predicted an increased pacing threshold within 1 month of Micra-TPS implantation.
Why the study?
In some patients receiving a Micra transcatheter pacing system, pacing threshold increases shortly after implantation, but the causes and predictors of this increase are unknown.
What are the predictors of an increase in pacing threshold after Micra transcatheter pacing system implantation?
Population
64 consecutive patients undergoing Micra-TPS implantation between 2017 and 2020
Comparison
Increased pacing threshold group vs stable pacing threshold group
Design
Cohort study
Follow-up
1 month
Authors
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Implant impedance and thresholds were associated with early rise after Micra-TPS; hypothesis-generating for risk stratification in prospective cohorts.
Cohort (n=64)
What are the predictors of an increase in pacing threshold after Micra transcatheter pacing system implantation?
Absolute Event Rate: 582% vs 755%
p-value: p=<0.001
Implant impedance >660 Ω and threshold <1.0 V/0.24 ms may predict an early increase in pacing threshold after Micra-TPS implantation due to micro-dislodgement.
Higuchi et al. (2020) conducted a cohort in Micra transcatheter pacing system (Micra-TPS) implantation (n=64). Increased pacing threshold (IPT) within 1 month vs. Stable pacing threshold (SPT) was evaluated on Implant impedance (Ω) (p=<0.001). Lower implant impedance (582 vs 755 Ω, P<0.001) and higher implant thresholds (1.29 vs 0.71 V, P=0.014) predicted an increased pacing threshold within 1 month of Micra-TPS implantation.
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