目的 探讨CTA所评估的股动脉 显著性狭窄(大于50%)后股深动脉侧枝循 环的作用。方法 回顾性分析45例股动脉 显著性狭窄组患者与40例健康对照组的 CTA。统计病例组来自同侧股深动脉代偿 的征象，即旋股外侧动脉降支(和)或股 深动脉降支偏利现象(与对侧相比血管增 粗，分支增多或直接与股动脉直接相通) 的出现频率，并与对照组进行比较。同时 记录45例病例组偏利现象的评分及股动脉 狭窄的程度，对不同的狭窄程度分组并进 行组间比较分析。结果 病例组病变同侧 股深动脉偏利现象的出现频率明显高于对 照组(P＜0.1)。不同狭窄组之间偏利现象 的评分差异有统计学意义(P＜0.1)，狭窄 程度由小到大其偏利现象的评分依次降 低。结论 股动脉显著性狭窄后，CTA可以 通过观察病变同侧股深动脉及其分支偏利 现象间接评价来自旋股外侧动脉降支和 (或)股深动脉降支的侧枝循环状况。CTA 所评价的股动脉显著性狭窄与侧枝循环 之间有密切的相关性。CTA准确评价股动 脉狭窄程度及侧枝循环情况对临床的诊治 及预后周围动脉闭塞性疾病重要的指导意 义。

Objective To investigate the role of CTA in evaluation of peripheral collateral circulation after femoral artery significant stenosis. Methods CTA fingdings were retrospecitvely reviewed in 45 patients with femoral artery significant stenosis and 40 healthy control subjects. Frequency of descending branch of lateral circumflex femoral artery and descending branch of arteria profunda femoral laterality at CTA in patients and that in healthy control subjects were compared. The descending branch of lateral circumflex femoral artery and descending branch of arteria profunda femoral laterality represents the existence of collateral circulation.Meanwhile, The descending branch of lateral circumflex femoral artery and descending branch of arteria profunda femoral laterality were scored,and the degree of stenosis of femoral artery was recorded,then divided them into three groups according to degree of stenosis ,and the groups were compared with each other. Results Frequency of arteria profunda femoral laterality in patients are much higher than that in healthy control subjects(P<0.1). There are statistic differences between scores of arteria profunda femoral laterality of each two groups. Conclusion After femoral artery significant stenosis, the laterality of arteria profunda femoral at CTA can be used to investigate the collateral circulation from the the descending branch of lateral circumflex femoral artery and descending branch of arteria profunda femoral.The collateral circulation evaluated at CTA is significantly associated with the degree of stenosis of femoral artery. CTA might play an important role in diagnosis, treatment and prognosis for patients with peripheral arterial obliterans disease.