无桩尖管桩锤打过程易造成管桩移位、内伤、断桩、嵌岩差、持力层锚固长度小。

Shift, internal injury, breaking, bad imbedded in rock, as well as short anchorage distance etc.

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结果：重度MVPS患者手术、病理及电镜检查均证实为原发性二尖瓣黏液样变性，胶原、弹力纤维溶解或离断。

Result:Severe patients with MVPS were diagnosed as primary myxomatous degeneration by surgery, pathology and electron-microscope.

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