{
  "abstract": "BACKGROUND: Postoperative pericardial effusion (PPE) is a known complication associated with the use of leadless pacemakers (LPMs). The risk score (RS) is a useful tool for risk stratification. This study evaluated the utility of risk stratification using the RS in Japanese patients who received the Micra LPM. METHODS AND RESULTS: We retrospectively enrolled 443 patients who received Micra LPMs that were implanted at 4 institutions between August 2017 and August 2024. Patients were risk stratified using the RS into 3 groups: low risk (score ≤0), intermediate risk (score 1), and high risk (score ≥2). PPEs were observed in 9.0% (20/221), 11.7% (9/77) and 17.9% (26/145) of patients in the low-, intermediate-, and high-risk groups, respectively (P=0.041). In multivariable analysis, chronic obstructive pulmonary disease was a significant risk factor (P=0.014) for PPE, whereas prior cardiac surgery significantly reduced the risk of PPE (P=0.023). Older age, being female, and hemodialysis were not identified as risk factors. Subsequently, we modified the RS (mRS). Using the mRS, PPEs were observed in 8.8% (27/306), 16.5% (14/85), and 26.9% (14/52) of patients in the low-, intermediate-, and high-risk groups, respectively (P<0.001). CONCLUSIONS: The original RS is useful for PPE risk stratification after Micra LPM implantation. However, the mRS provides better risk discrimination and may therefore be a more suitable tool for use in the Japanese population.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 22,
  "authors": [
    {
      "name": "Yuya Komai"
    },
    {
      "name": "Hitoshi Minamiguchi"
    },
    {
      "name": "Masayuki Ishimura"
    },
    {
      "name": "Yuichiro Sakamoto"
    },
    {
      "name": "Masahiro Nakano"
    },
    {
      "name": "Takatsugu Kajiyama"
    },
    {
      "name": "Miyo Nakano"
    },
    {
      "name": "Toshinori Chiba"
    },
    {
      "name": "Satoko Ryuzaki"
    },
    {
      "name": "Yukiko Takanashi"
    },
    {
      "name": "Yusei Nishikawa"
    },
    {
      "name": "Takashi Kanda"
    },
    {
      "name": "Mikiko Matsumura"
    },
    {
      "name": "Naoki Mori"
    },
    {
      "name": "Yuma Hamanaka"
    },
    {
      "name": "Takashige Sakio"
    },
    {
      "name": "Yuki Shibuya"
    },
    {
      "name": "Daisuke Yoshimoto"
    },
    {
      "name": "Yuko Uemura"
    },
    {
      "name": "Shoko Narumi"
    },
    {
      "name": "Yoshio Kobayashi"
    },
    {
      "name": "Yusuke Kondo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/92dh76wg1tmay.bib",
  "cited_by": 0,
  "doi": "10.1253/circj.cj-25-1061",
  "fulltext_url": "https://www.jstage.jst.go.jp/article/circj/advpub/0/advpub_CJ-25-1061/_article",
  "id": "92dh76wg1tmay",
  "issns": [
    "1347-4820",
    "1346-9843"
  ],
  "landing_url": "https://www.jstage.jst.go.jp/article/circj/advpub/0/advpub_CJ-25-1061/_article",
  "language": null,
  "licence": "CC-BY-NC-ND",
  "licence_label": "CC BY-NC-ND",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "jstage-journal",
      "medicine/cardiovascular"
    ],
    [
      "openalex",
      "2705|Cardiac pacing and defibrillation studies"
    ]
  ],
  "openalex": "W7215679402",
  "pdf_url": "https://www.jstage.jst.go.jp/article/circj/advpub/0/advpub_CJ-25-1061/_pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/92dh76wg1tmay.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:24Z",
      "native_id": "10.1253/circj.cj-25-1061",
      "source": "jstage",
      "url": "https://www.jstage.jst.go.jp/article/circj/advpub/0/advpub_CJ-25-1061/_article"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "openalex:2705|Cardiac pacing and defibrillation studies",
      "subfield": "cardiovascular"
    }
  ],
  "title": "Risk Stratification for Pericardial Effusion After Leadless Pacemaker Implantation ― Multicenter Study ―",
  "title_text": "Risk Stratification for Pericardial Effusion After Leadless Pacemaker Implantation ― Multicenter Study ―",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:24Z",
  "url": "https://research.draconitic.com/paper/92dh76wg1tmay",
  "venue": "Circulation Journal",
  "versions": []
}