title: [Early calcification of bioprosthetic valve in a hemodialysis patient with secondary hyperparathyroidism;report of a case].
abstract: Aortic valve replacement using CEP Magna 21 mm bioprosthetic valve was performed because of aortic valve stenosis in a 75-year-old man with maintenance dialysis. In the 39th postoperative month, the bioprosthetic valve malfunction due to calcification was noted, and it was replaced. Judging from the previously reported cases, malfunction of an artificial valve in the 39th month is thought to be relatively early. Early-stage calcification of a bioprosthetic valve is considered to be caused by secondary hyperparathyroidism due to artificial dialysis. Therefore, careful consideration is necessary in selecting an artificial valve in a dialysis patient. To prevent early-stage calcification of a bioprosthetic valve in a dialysis patient, strict control of parathyroid hormones, blood phosphorus and calcium levels is necessary. In addition, due to the attendant risk of calcification of bioprosthetic valves, mechanical valves are recommended to dialysis patients, who are expected to survive for more than 3 years and who are not expected to develop hemorrhagic complications.
authors.affiliation: Department of Cardiovascular Surgery, Nakadori General Hospital, Akita, Japan.
authors.forename: Yukinobu
authors.initials: Y
authors.lastname: Ito
authors.forename: Shingo
authors.initials: S
authors.lastname: Ohuchi
authors.forename: Tadashi
authors.initials: T
authors.lastname: Okubo
authors.forename: Takanori
authors.initials: T
authors.lastname: Harima
authors.forename: Makoto
authors.initials: M
authors.lastname: Sato
authors.forename: Tomonori
authors.initials: T
authors.lastname: Igarashi
mesh_terms: D000368:Aged; D001021:Aortic Valve / Q000473:pathology* / Q000601:surgery; D001024:Aortic Valve Stenosis / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D001705:Bioprosthesis / Q000009:adverse effects*; D002114:Calcinosis / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D006350:Heart Valve Prosthesis / Q000009:adverse effects*; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D006962:Hyperparathyroidism, Secondary / Q000150:complications*; D008297:Male; D011475:Prosthesis Failure / Q000209:etiology*; D006435:Renal Dialysis / Q000009:adverse effects*; D012086:Reoperation; D013997:Time Factors