Evidence map›Paper›PMID 41609266›Full record

ArticleJACC. Case reports2026

The Combined Konno-Nicks Procedure for Severely Stenotic Aortic Root and Left Ventricular Outflow Tract.

Masaru Matsuda, Shin Yajima, Daisuke Yoshioka, Kazuo Shimamura, Ai Kawamura, Takuji Kawamura, Yusuke Misumi, Shunsuke Saito, Shigeru Miyagawa

Abstract readCase Reports
PubMed Full text at PMC Publisher
In one paragraph

Article in JACC. Case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing 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

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

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

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

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

9 authors.

Masaru MatsudaDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.
Shin YajimaDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.
Daisuke YoshiokaDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan. Electronic address: djason55@gmail.com.
Kazuo ShimamuraDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.
Ai KawamuraDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.
Takuji KawamuraDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.
Yusuke MisumiDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.
Shunsuke SaitoDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.
Shigeru MiyagawaDepartment of Cardiovascular Surgery, University of Osaka, Suita, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundPatients with a small aortic root and subvalvular stenosis are at risk of prosthesis-patient mismatch, making annular and left ventricular outflow tract (LVOT) enlargement essential. CASE SUMMARY: We herein report the case of a 41-year-old woman with prosthetic valve dysfunction and severe LVOT obstruction due to pannus formation in whom a 12-mm sizer could not be passed. Redo aortic valve replacement with the combined Konno-Nicks procedure successfully enlarged the annulus and LVOT, enabling the implantation of a 4-size larger prosthesis based on intraoperative sizer measurements. Postoperative echocardiography and computed tomography confirmed effective valve enlargement and preserved valve function. DISCUSSION: Combined anterior-posterior enlargement can be valuable for redo aortic valve replacement in patients with a small annulus and subvalvular stenosis to prevent prosthesis-patient mismatch. TAKE-HOME MESSAGE: The combined Konno-Nicks procedure can effectively relieve prosthetic valve dysfunction with severe subvalvular stenosis by enabling larger prosthesis implantation.

Indexed as

aortic root enlargementKonno procedureNicks procedureprosthetic valve dysfunctionsubvalvular stenosis

Identifiers

PMID41609266
PMCPMC12882681

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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.