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Finite element analysis regarding patch size, stiffness, and contact condition to the endocardium in surgery for post infarction ventricular septal rupture

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An Editorial to this article was published on 22 August 2013

Abstract

Background

The purpose of this study is to establish a rational surgical design to minimize suture line stress of the patch and thus prevent residual leakage in surgery for post infarction ventricular septal rupture (VSR).

Methods

A computer model that simulates surgery for VSR was developed. Stress force on the suture line of the patch was calculated at varying size, stiffness, and contact condition of the endocardial patch to the inner surface of the heart using a finite element analysis. Clinical results and echo findings of 34 consecutive patients with a mean age of 72.6 ± 9.5 (range 55–89) who underwent emergency surgery for VSR from 1995 to 2012 were reviewed.

Results

Suture line stress decreased by two-thirds as the size or stiffness of the patch increased in comparison with the basic conditions that mimic a pericardial patch fitted to the septal plane. On the other hand, suture line stress increased sixfold when there was a dead space beneath the patch. 30-day mortality was 12 %, and in-hospital mortality 18 %. On echocardiography, all three patients who had dead space beneath the patch had residual leak. Another patient who had huge posterior defect also showed residual leak. Clinical results were well matched to model results. 5-year survival rate of all patients who received operation was 68.7 ± 9.3 %.

Conclusion

In endocardial patch type surgery for VSR, proper sizing of the patch to sufficiently fit to endocardial surface in a tension-free condition is the most important to avoid residual leak.

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Acknowledgments

We greatly appreciate the assistance of Mr. Yasuhiro Mikoshiba in creating and calculating the FEA model.

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Authors and Affiliations

  1. Department of Cardiovascular Surgery, Japanese Red Cross Nagoya First Hospital, 3-35 Michishita-cho, Nakamura, Nagoya, 453-8511, Japan

    Toshiaki Ito & Atsuo Maekawa

  2. Department of Cardiovascular Surgery, Kasugai Municipal Hospital, 1-1-1, Takaki-cho, Kasugai, 486-8510, Japan

    Hiroaki Hagiwara

  3. Department of Cardiovascular Surgery, Kainan Hospital, 396 Minamihonda, Maekasu-cho, Yatomi, 498-8502, Japan

    Takenori Yamazaki

Authors
  1. Toshiaki Ito
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  2. Hiroaki Hagiwara
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  3. Atsuo Maekawa
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  4. Takenori Yamazaki
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Correspondence to Toshiaki Ito.

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Ito, T., Hagiwara, H., Maekawa, A. et al. Finite element analysis regarding patch size, stiffness, and contact condition to the endocardium in surgery for post infarction ventricular septal rupture. Gen Thorac Cardiovasc Surg 61, 632–639 (2013). https://doi.org/10.1007/s11748-013-0255-z

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  • DOI: https://doi.org/10.1007/s11748-013-0255-z

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