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Prevalence of pannus formation after aortic valve replacement: clinical aspects and surgical management

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Abstract

Pannus formation after aortic valve replacement is not common, but obstruction due to chronic pannus is one of the most serious complications of valve replacement. The causes of pannus formation are still unknown and effective preventive methods have not been fully elucidated. We reviewed our clinical experience of all patients who underwent reoperation for prosthetic aortic valve obstruction due to pannus formation between 1973 and 2004. We compared the initial 18-year period of surgery, when the Björk–Shiley tilting-disk valve was used, and the subsequent 13-year period of surgery, when the St. Jude Medical valve was used. Seven of a total of 390 patients (1.8%) required reoperation for prosthetic aortic valve obstruction due to pannus formation. All seven patients were women; four patients underwent resection of the pannus and three patients needed replacement of the valve. The frequency of pannus formation in the early group was 2.4% (6/253), whereas it was 0.73% (1/137) in the late group (P < 0.05). Pannus was localized at the minor orifice of the Björk–Shiley valve in the early group and turbulent transvalvular blood flow was considered to be one of the important factors triggering its growth. We also consider that small bileaflet valves have the possibility of promoting pannus formation and that the implantation of a larger prosthesis can contribute to reducing the occurrence of pannus.

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Authors and Affiliations

  1. Department of Cardiovascular Surgery, Jikei University School of Medicine, 3-25-8 Nishishinbashi, Minato-ku, Tokyo, 105-8461, Japan

    Yoshimasa Sakamoto MD, Kazuhiro Hashimoto MD, Hiroshi Okuyama MD, Shinichi Ishii MD, Taguchi Shingo MD & Hiroshi Kagawa MD

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  1. Yoshimasa Sakamoto MD
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  2. Kazuhiro Hashimoto MD
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  3. Hiroshi Okuyama MD
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  4. Shinichi Ishii MD
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  5. Taguchi Shingo MD
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  6. Hiroshi Kagawa MD
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Correspondence to Kazuhiro Hashimoto MD.

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Sakamoto, Y., Hashimoto, K., Okuyama, H. et al. Prevalence of pannus formation after aortic valve replacement: clinical aspects and surgical management. J Artif Organs 9, 199–202 (2006). https://doi.org/10.1007/s10047-006-0334-3

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  • DOI: https://doi.org/10.1007/s10047-006-0334-3

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