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Prosthetic valve endocarditis caused by silent infection of methicillin-resistant coagulase-negative staphylococci
  1. Kayo Sugiyama,
  2. Hirotaka Watanuki,
  3. Yasuhiro Futamura and
  4. Katsuhiko Matsuyama
  1. Department of Cardiac Surgery, Aichi Medical University, Nagakute, Aichi, Japan
  1. Correspondence to Dr Kayo Sugiyama; kayotaro3{at}


Surgery for prosthetic valve endocarditis in the mitral valve position is still challenging for surgeons. Reconstruction of the mitral annulus is useful for patients with a mitral annulus disputed by infection. Here, we report a redo mitral valve replacement using a collar-reinforced tissue valve, which was inserted into a mitral annulus reconstructed with a bovine patch. Though the preoperative blood culture detected Streptococcus anginosus, the intraoperative culture detected methicillin-resistant coagulase-negative staphylococci (MRCNS). MRCNS is rarely detected because of its indolent nature.

  • heart failure
  • valvar diseases
  • surgical diagnostic tests
  • infections
  • infectious diseases

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  • Contributors All the authors equally took part in the conception of the case studies. Acquisition: KS and KM; analysis: KS and YF; interpretation of data: KS, YF and HW; drafting and revising of the paper: KS; final approval of the paper: all authors; agreement to be accountable for the integrity of the case reports: all authors.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.