Long-Term Clinical Outcomes of the On-X Mechanical Prosthetic Valve in the Aortic or Mitral Position　― A Single-Center Experience of up to 20 Years’ Follow up ―

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  • Kim Ji Seong
    Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital
  • Kang Yoonjin
    Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital
  • Sohn Suk Ho
    Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital
  • Hwang Ho Young
    Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital
  • Choi Jae Woong
    Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital
  • Kim Kyung Hwan
    Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital

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<p>Background:This study evaluated the long-term outcomes for up to 20 years after On-X mechanical valve implantation in the left side of the heart.</p><p>Methods and Results:Between 1999 and 2015, 861 patients (mean age=51.6±10.9 years) who underwent prosthetic valve replacement using the On-X valve in the aortic or mitral position were enrolled (aortic=344, mitral=325, double=192). The mean clinical follow-up duration was 10.5±5.3 (median 10.9) years. Operative mortality occurred in 26 patients (3.0%), and linearized late cardiac mortality was 0.9%/patient-year without an intergroup difference. Linearized thromboembolism, bleeding, prosthetic valve endocarditis, non-structural valve deterioration (NSVD), and reoperation rates were 0.8%/patient-year, 0.6%/patient-year, 0.2%/patient-year, 0.5%/patient-year, and 0.5%/patient-year, respectively. Prosthetic valve endocarditis was more frequent after double valve replacement than after aortic or mitral valve replacement (P=0.008 and 0.005, respectively). NSVD and reoperation rates were significantly lower aortic valve replacement than after mitral or double valve replacement (P=0.001 and 0.002, P=0.001 and <0.001, respectively). Valve replacement in the mitral position was the only risk factor for NSVD (hazard ratio [95% confidence interval]=5.247 [1.608–17.116], P=0.006).</p><p>Conclusions:On-X valve implantation in the left side heart had favorable clinical outcomes with acceptable early and late mortality and a low incidence of prosthetic valve-related complications. Particularly in the aortic position, the On-X valve had better long-term non-structural durability.</p>

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  • Circulation Journal

    Circulation Journal 85 (7), 1042-1049, 2021-06-25

    一般社団法人 日本循環器学会

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