Tong Y, Royle J
Vascular Surgery Unit, Austin Hospital, Melbourne, Australia.
J Dermatol Surg Oncol. 1994 Oct;20(10):676-8. doi: 10.1111/j.1524-4725.1994.tb00451.x.
The limitations of continuous wave (CW) Doppler have been recognized in the assessment of venous reflux since CW Doppler is not able to distinguish reflux signals from more than one vein. In our experience, some regions with venous reflux suggested by CW Doppler were noted to have no reflux in any individual vein during duplex studies.
The aim of the study was to assess the anatomic source of the venous reflux suggested by CW Doppler but not confirmed by duplex ultrasound.
Five hundred and fifty-one consecutive lower limbs with primary or recurrent varicose veins were examined with CW Doppler and subsequently by color-coded duplex ultrasound to assess the source of venous reflux.
The duplex ultrasound study revealed no reflux in 44 specific regions (8%) where reflux had been indicated by CW Doppler. Two types of anatomy were noted. Two or more superficial veins joined the deep venous system via a common junction in 25 cases. A descending vein joined the deep venous system in 19 cases.
A bidirectional Doppler signal in a region of venous junction without any incompetent veins can be misinterpreted as venous reflux. A careful examination of veins not only at the region of the junction, but also at some distance down the stem of the vein is important during CW Doppler or duplex assessment.
连续波（CW）多普勒在评估静脉反流方面的局限性已得到公认，因为CW多普勒无法区分来自多条静脉的反流信号。根据我们的经验，在一些经CW多普勒提示存在静脉反流的区域，在双功超声检查中发现单个静脉并无反流。
本研究旨在评估经CW多普勒提示但未被双功超声证实的静脉反流的解剖学来源。
对551例原发性或复发性下肢静脉曲张患者连续进行检查，先用CW多普勒，随后用彩色编码双功超声评估静脉反流的来源。
双功超声检查显示，在44个经CW多普勒提示有反流的特定区域（8%）未发现反流。发现了两种解剖类型。25例中，两条或更多条浅静脉通过一个共同的汇合点汇入深静脉系统。19例中，一条下行静脉汇入深静脉系统。
在静脉汇合区域出现的双向多普勒信号，若没有任何功能不全的静脉，可能会被误判为静脉反流。在进行CW多普勒或双功超声评估时，不仅要仔细检查汇合区域的静脉，还要检查静脉主干向下一段距离处的静脉，这一点很重要。
