Baxter G M, Williamson T H
Department of Radiology, Western Infirmary, Glasgow, Scotland.
Radiology. 1993 Jun;187(3):847-50. doi: 10.1148/radiology.187.3.8497643.
Central retinal vein occlusion (CRVO) is a common cause of sudden visual loss and can occur at any age. Accurate diagnosis is essential, as differentiation of ischemic and nonischemic forms of the disease has prognostic importance. The introduction of color Doppler flow ultrasound has, for the first time, allowed visualization of the retrobulbar vessels; the central retinal artery and vein are easily identifiable. The authors conducted a prospective, blinded trial and compared images and waveforms from 20 patients with CRVO with those from 20 age-matched healthy volunteers. No difference in velocity indexes from the central retinal artery was detected between the patients' affected and unaffected eyes or between the affected eyes and control eyes. A marked reduction in venous velocity was recorded in the central retinal vein in the affected eyes when compared with that of the unaffected patient and control eyes. There was no difference in venous flow between the unaffected patient and control eyes. These initial results suggest that color Doppler flow imaging may have a role in the diagnosis of CRVO. Color Doppler flow imaging is non-invasive, is easy to perform, is well tolerated by patients, and allows temporal assessment.
视网膜中央静脉阻塞（CRVO）是导致突然视力丧失的常见原因，可发生于任何年龄。准确诊断至关重要，因为区分该疾病的缺血性和非缺血性形式具有预后意义。彩色多普勒血流超声的引入首次实现了球后血管的可视化；视网膜中央动脉和静脉易于识别。作者进行了一项前瞻性、双盲试验，比较了20例CRVO患者与20例年龄匹配的健康志愿者的图像和波形。在患者患眼和未患眼之间或患眼与对照眼之间，未检测到视网膜中央动脉速度指数的差异。与未患眼患者和对照眼相比，患眼中视网膜中央静脉的血流速度明显降低。未患眼患者和对照眼之间的静脉血流无差异。这些初步结果表明，彩色多普勒血流成像可能在CRVO的诊断中发挥作用。彩色多普勒血流成像具有非侵入性、操作简便、患者耐受性好以及可进行时间评估等优点。
