The following information was obtained from the professional literature of japanese society of pediatric cardiology and cardiac surgery (id# (b)(4)).The patient had congenital mitral regurgitation and aortic valve stenosis and mitral valvuloplasty was performed at the age of one year and six months.Mitral valve replacement was performed at (b)(6) and a 27 mm masters series mechanical heart valve was implanted.Concomitantly, aortic valve replacement was performed and a 23 mm artificial heart valve (unknown model) was implanted.After the procedure, the patient was reported to be stable.However, on the postoperative year 23 (at the age of (b)(6)), congestive heart failure and pulmonary hypertension due to prolapse of the mitral valve were observed.In addition, leakage was confirmed from perivalvular on the septal side.The valve was explanted and replaced with a 25 mm valve (unknown model).
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