Using CPD, the PTRs of deep vein in lower limbs, femoral common vein and popliteal vein were remarkably larger than those in control group(all P< 0.001) .

观察组下肢深静脉彩色脉冲多普勒（CPD）返流持续时间（PTR）、股总静脉PTR、朋静脉PTR明显大于对照组（均P<0.001）。

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Using CPD, the PTRs of deep vein in lower limbs, femoral common vein and popliteal vein were remarkably larger than those in control group(all P< 0.001) .

观察组下肢深静脉彩色脉冲多普勒（CPD）返流持续时间（PTR）、股总静脉PTR、朋静脉PTR明显大于对照组（均P<0.001）。

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