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Clinical applicatin of electron beam CT in the diagnosis of ventricular septal defect classification of double-outlet right ventricle
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF RADIOLOGY
- Issue:
- 5
- DOI:
- 10.3760/j.issn:1005-1201.2001.05.008
- Key Word:
- 心血管畸形;室间隔缺损;体层摄影术,X线计算机
Abstract： 目的探讨电子束CT(EBCT)在右室双出口室间隔缺损(VSD)分型诊断中的临床价值.方法对经EBCT检查,手术或心血管造影证实、不合并完全性心内膜垫缺损的右室双出口病例14例行回顾性分析.男10例,女4例.年龄1～29岁,平均9.7岁.EBCT均采用单层无间隔增强扫描,层厚3 mm.重点观察和测量以下内容:VSD上缘与主动脉瓣、肺动脉瓣下缘及三尖瓣环上缘的位置关系与距离;肌性流出道的位置,大动脉有无骑跨.距离以所在层面床位差计.结果 (1)主动脉瓣下VSD 7例,缺损与主动脉瓣和肺动脉瓣的距离均数分别为5.6和15mm,有极显著性差异(t=4.69,P＜0.005).所有主动脉瓣所在层面均低于肺动脉瓣,且靠近VSD,3例主动脉瓣骑跨于VSD.(2)肺动脉瓣下VSD 4例,缺损与肺动脉瓣和主动脉瓣的距离均数为3和9mm,有显著性差异(t=4.91,P＜0.05).所有肺动脉瓣所在层面均低于主动脉瓣,且更接近VSD,2例肺动脉瓣骑跨于VSD.(3)主、肺动脉瓣下VSD 2例,缺损位于主、肺动脉瓣正下方,与两者距离为0～1.5mm.前述3型VSD,除1例上缘与三尖瓣环上缘相平外,均高于三尖瓣环.(4)远离大动脉型1例,VSD与主、肺动脉瓣距离分别为30和45mm,VSD上缘低于三尖瓣环30mm.结论 EBCT可精确显示右室双出口VSD位置.利用EBCT主、肺动脉瓣及三尖瓣与VSD所在层面的高低及邻近关系可简捷判断右室双出口VSD分型.
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