To recruit patients who implanted with Perimount Heart Valve (Type Number: 6900PTFX or 2800TFX) from three hospitals in China. To track the patients'situations during one year after surgery and to collect the relevant clinical data.
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Twice echocardiography to evaluate the performance of heart valve
Timeframe: Compare the 1st echocardiography at average 6 months after surgery and 2nd echocardiography at 12 months after surgery
The recovery status of patients after surgery
Timeframe: The subjects will be followed for the duration of one year after surgery