目的 探讨产前超声诊断胎儿完全性血管环的临床价值。方法 回顾性分析6例经引产后尸检证实的完全性血管环胎儿的产前超声表现，总结其声像图特点。结果 5例为右位主动脉弓伴左侧动脉导管构成的完整血管环;1例为双主动脉弓构成的完整血管环。在三血管-气管平面显示5例主动脉弓走行在气管右侧，与左侧动脉导管在气管后方交汇，构成“U”形动脉弓，包绕气管;1例主动脉弓在气管前呈“Y”形分支走行在气管两侧并在气管后方汇合，构成“O”形动脉环，包绕气管。结论 产前超声诊断胎儿双主动脉弓及右位主动脉弓伴左侧动脉导管构成的完全性血管环具有重要临床价值。三血管-气管平面是产前超声诊断胎儿血管环的重要切面。%Objective To investigate the clinical value of fetal echocardiography in prenatal diagnosis of complete vascular ring. Methods Ultrasound images of 6 cases with complete vascular ring were retrospectively analysed and summarized, all cases were confirmed by autopsy after termination of pregnancy. Results Right aortic arch and left ductus arteriosus formed "U" shaped comlete vascular ring coursing around the trachea in 5 cases, left aortic arch and right aortic arch formed "O" shaped complete vascular ring in 1 case on three-vessel trachea view. Color Dopple flow imaging aided in identifying various components of the vascular ring. Conclusions Fetal echocardiography is of great clinical value in prenatal diagnosis of complete vascular ring. Three-vessel trachea view is important for screening with particular attention to the relationship of the aortic and duct arches to the trachea.
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