并在此条件下合成了多种环缩醛，收率62。

The yields of other cyclic acetals were between 62.

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结论静脉环缩术是治疗严重下肢深静脉倒流性疾病的有效方法。

Conclusion Annular constriction is effective in treating severe venous insufficiency of legs.

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目的研究和评价应用静脉环缩术治疗严重下肢深静脉倒流性疾病的机理和疗效。

Objective To study the mechanism and therapeutic effects of annular constriction for severe venous insufficiency of legs.

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