Original article: cardiovascularLate results after mitral valve replacement with bileaflet mechanical prosthesis in children: evaluation of prosthesis-patient mismatch
Section snippets
Patients and methods
Since 1982, 37 mitral valve replacements using a bileaflet mechanical prosthetic valve were performed in 32 children at Fukuoka Children's Hospital or Kyushu University Hospital. The age at implantation of the prosthesis ranged from 2 months to 16 years (mean, 5.6 years of age), and body weight ranged from 3 kg to 37.3 kg (mean, 15.9 kg). As a previous procedure, correction of atrioventricular septal defect was performed in 12 patients (partial type in 9 and complete type in 3), correction of
Results
Figure 1 shows the size of the prosthesis and body weight of the patients at the time of implantation. The sizes of St. Jude Medical valve hemodynamic plus series is considered to be 2 mm bigger than its original size, because the manufactured valve orifice area of the St. Jude Medical valve hemodynamic plus series is 2 mm bigger than the manufactured valve orifice area of the St. Jude Medical standard valve with the same valve diameter.
There was no operative death. There were 5 late deaths,
Comment
Although reparative techniques of the mitral valve abnormalities in children have made remarkable progress with acceptable midterm and long-term results 1, 2, 3, 4, 5, 6, a reparative procedure is not always feasible. Uva and colleagues [2] reported that one fourth of their patients who had undergone repair of congenitally malformed mitral valve needed subsequent replacement of the valve. Their result was comparable with the data of our previous report [5] of 20% incident rate of mitral valve
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