The follow - up data and results of two were studied and compared.

结果与对照组比较,保留二尖瓣装置的二尖瓣替换术后心功能恢复更好.

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Follow - up data was obtained through correspondence and outpatient department visits with the follow - up rate being 88.8 %.

随 访 结果是通过信件、电话及门诊获得,随访率为88.8%.

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