Evidence map›Paper›PMID 41055208›Full record

ArticleClinical cardiology2025

Computed Tomography-Verified Pacing Location of Micra Leadless Pacemakers and Characteristics of Paced Electrocardiograms in Bradycardia Patients.

Jianghua Zhang, Xianhui Zhou, Yanmei Lu, Yaodong Li, Qiang Xing, Zukela Tuerhong, Xu Yang, Jiasuoer Xiaokereti, Yankai Guo, Xiaohong Zhou and 3 more

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In one paragraph

Article in Clinical cardiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.

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0cells of the map it votes in
4citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

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Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

4 citing papers in PubMed.

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4 · The record

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PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors.

Jianghua ZhangCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
Xianhui ZhouCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.ORCID https://orcid.org/0000-0002-2209-1367
Yanmei LuCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.ORCID https://orcid.org/0000-0002-7293-8634
Yaodong LiCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.ORCID https://orcid.org/0000-0003-1805-9433
Qiang XingCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
Zukela TuerhongCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
Xu YangCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
Jiasuoer XiaokeretiCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
Yankai GuoCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
Xiaohong ZhouResearch and Technology Division, Cardiac Rhythm Management, Medtronic Inc., Minneapolis, Minnesota, USA.
Samantha KohnleResearch and Technology Division, Cardiac Rhythm Management, Medtronic Inc., Minneapolis, Minnesota, USA.
Siyuan ZouCardiac Rhythm Management, Medtronic (Shanghai), Shanghai, China.
Baopeng TangCardiac Pacing and Electrophysiology Department, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.ORCID https://orcid.org/0000-0002-4845-8091

Funding

This study was supported by Natural Science Foundation of Xinjiang Uygur Autonomous Region (Grant number 2022D01C486).
6 · The paper itself

Abstract

introductionThe leadless pacemakers are implanted routinely under fluoroscopic image, yet the pacing sites and corresponding paced electrocardiography (ECG) remain unclear. This study was to determine the computed tomography (CT)-verified location of the leadless Micra pacemakers (Micra) and ECG characteristics.

methodsTwenty consecutive patients who met the pacemaker indications for bradycardia and underwent fluoroscopy assisted Micra implantation were enrolled. All subjects underwent a postoperative CT scan to determine the precise location of the Micra pacing tip. Paced 12-lead ECG characteristics were analysed and correlated with the Micra tip location.

resultsIn the nine partitions of fluoroscopic RAO images, 14 (70%) of 20 patients had the Micra tip in zone 5, 5 (25%) in zone 6 and 1 in zone 2. Reconstructed CT 3-D cardiac images found Micra tips mostly clustered near the anterior insertion between the RV septum and free wall with 12 cases at the insertion-septal side and 8 at the free-wall side. ECG morphological analysis found that the peak deflection index in ECG lead V1 was 0.409 ± 0.058 for Micra tips at the insertion-septal side and 0.527 ± 0.062 in the free-wall side (p < 0.001 between two sides) and R wave amplitude in lead V6 appeared larger for Micra tips in the free-wall group compared to Micra tips in the insertion-septal group, while there was no difference in QRS duration between two sides.

conclusionIn routine Micra implantation, the pacing sites were often located in the anterior insertion region.

Indexed as

BradycardiaCardiac Pacing, ArtificialElectrocardiographyHeart RatePacemaker, ArtificialTomography, X-Ray ComputedAgedAged, 80 and overEquipment DesignFemaleFluoroscopyHumansMaleMiddle AgedPredictive Value of TestsRetrospective Studiesbradycardiacardiac computed tomographyleadless pacemakerright ventricular septum

Identifiers

PMID41055208
PMCPMC12501953

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.