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Association Between Micra Transcatheter Pacing System Curvature and Capture Threshold During Implantation
Qiang Xing1,2, Zukela Tuerhong1,2, Renqing Guo3
1Cardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China.
Pacing and Clinical Electrophysiology : PACE
|May 16, 2026
Summary
Micra transcatheter pacing system (TPS) curvature before implantation predicts acceptable capture thresholds. A curvature of ≤0.799 reliably indicates successful Micra TPS implantation, enhancing procedural safety.
Area of Science:
- Cardiology
- Medical Devices
- Electrophysiology
Background:
- No prior studies investigated the link between Micra transcatheter pacing system (TPS) curvature and implantation thresholds.
- This study aimed to explore the association between Micra TPS curvature and pre-deployment capture thresholds.
Purpose of the Study:
- To evaluate the relationship between Micra TPS curvature and acceptable capture thresholds during implantation.
- To determine if pre-deployment curvature can predict successful Micra TPS implantation.
Main Methods:
- Micra TPS implantation was performed in 180 patients with right ventriculography assistance.
- Micra TPS curvature was analyzed from right anterior oblique (RAO) images using Origin software.
- Electrical parameters were recorded for 30 minutes post-implantation at 10-minute intervals.
Main Results:
- Among 159 eligible patients, 79.2% had acceptable thresholds with a mean curvature of 0.58 ± 0.18.
- High-threshold patients (20.8%) showed significantly greater curvature (1.36 ± 0.64).
- Micra TPS curvature ≤0.799 predicted acceptable thresholds with 90.9% sensitivity and 91.3% specificity (AUC = 0.958).
Conclusions:
- Pre-deployment Micra TPS curvature of ≤0.799 in the RAO view reliably predicts acceptable capture thresholds.
- Integrating curvature assessment with right ventriculography improves Micra implantation procedural safety.
