多排螺旋CT在婴幼儿法洛四联症诊断中的价值
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摘要
目的
     法洛四联症(Tetralogy of Fallot,TOF)是紫绀型先天性心脏病(先心病)中最常见的一种,占紫绀型先心病的80%,占所有先心病的10%,是复杂先心病的50%-90%。对于法洛四联症的影像学诊断方法主要有经胸壁超声心动图(Transthoracic Echocardiography,TTE)、心血管造影(Angiocardiography,ACG)、电子束CT(Electron Beam Computed Tomography,EBCT)、核磁共振成像(Magnetic ResonanceImaging,MRI)及多排螺旋CT心血管造影(Multislice Spiral Computed TomographyAngiography,MSCTA)等。ACG被认为是诊断先天性心脏病的“金标准”。MSCTA是一种安全、无创、快速的先心病诊断技术。目前关于MSCTA对法洛四联症的定性诊断价值的研究的国内外文献较多,但对于MSCTA对法洛四联症的术前定量诊断价值探讨较少。本文通过将MSCTA和TTE检查所得的法洛四联症患者的具体数据进行统计学分析,研究MSCTA对法洛四联症的术前定量诊断价值;旨在为法洛四联症术前检查提供更加方便而准确的影像学诊断方法。
     材料和方法
     1.研究对象
     实验组:2007年7月至2008年11月在郑州大学第三附属医院术前进行MSCT心脏动态增强造影检查和TTE检查,并经手术中证实为法洛四联症的0-3岁患儿病例共65例。
     对照组:本院同时期相同年龄段,术前进行MSCT心脏动态增强造影检查术后证实为单纯室间隔缺损的患儿共54例。
     2.方法
     利用GE Lightspeed 16排螺旋CT对患儿进行MSCTA检查,所采集到的图像在ADW4.2工作站上利用各种重建技术分析、诊断、测量,并计算McGoon指数和Nakata指数。
     利用GE Vivid 7 PRO型彩超对患儿进行TTE检查,测量室间隔缺损宽度、肺动脉各段内径、降主动脉内径,并计算McGoon指数和Nakata指数。
     3.统计学检验
     应用SPSS16.0软件对所得数据计算均数、标准差及进行单因素方差分析并对MSCTA检查和TTE检查对于心外大血管的显示情况进行x~2检验。采用α=0.05检验标准。
     结果
     1.MSCT和TTE对于相同法洛四联症患者不同部位内径的测量所得的值无统计学差别(P>0.05)。
     2.MSCT对于法洛四联症患儿与单纯室间隔缺损患儿肺动脉各段内径的测量值有统计学差别(P<0.05)。
     3.MSCT和TTE在显示左右肺动脉近端时无统计学意义(P>0.05),而在显示左右肺动脉远端时有统计学差别(P<0.05)。
     结论
     1.MSCTA检查能够很好的对法洛四联症做出定性诊断,还能够对法洛四联症做出准确的定量诊断,对临床手术的选择及预后的评估有重要的意义。
     2.MSCTA检查作为一种安全、无创、快速、准确的先心病诊断方法,能够基本代替TTE检查。并且对于肺动脉等心外大血管畸形的诊断要优于TTE检查。
Objectives
     Tetralogy of Fallot (TOF) is one of the most common Cyanotic Congenital Heart Disease (CHD). It holds about 80% of Cyanotic Congenital Heart Disease,about 10% of all kinds of Congenital Heart Disease, about 50%-90% of complex Congenital Heart Disease, The diagnostic methods we have now including TTE (Transthoracic Echocardiography),ACG(Angiocardiography),EBCT(Electron Beam Computed Tomography),MRI (Magnetic Resonance Imaging) and MSCTA (Multislice Spiral Computed Tomography Angiography) ,et al. ACG is normally considered as the gold standard method of TOF. MSCTA as a diagnostic method of CHD has many advantages such as safe, noninvasive and fast. Nowadays there have some literatures about the quality diagnostic value of MSCTA, but less thesis about the quantity diagnostic value of MSCTA. My thesis paid attention to the quantity diagnostic value of MSCTA before surgery. Analyzed the patients' status of TOF which got by both MSCTA and TTE, in order to offer a quick and accuracy diagnostic method for TOF.
     Materials and Methods
     1. Object
     Experimental group: 65 cases 0-3 years old neonates and infants with Tetralogy of Fallot whom was certified by surgery and had examined by MSCTA and TTE in The Third Affiliated Hospital of Zhengzhou University between July 2007 and November 2008.
     Control group: 54 cases 0-3 years old neonates and infants with Ventricular Septal Defect whom was certified by surgery and had examined by MSCTA in The Third Affiliated Hospital of Zhengzhou University between July 2007 and November 2008.
     2. Method
     Examine the patient with MSCTA by GE Lightspeed 16 slices spiral CT. Then analyze, diagnose and measure images in workstation ADW 4.2 by all kinds of reformation methods and calculate McGoon Index and Nakata Index.
     Examine the patient with TTE by GE Vivid 7 PRO color Doppler ultrasound instrument. Measure the width of VSD, the inner diameter of pulmonary and descending aorta. Calculate McGoon Index and Nakata Index.
     3. Statistical analysis
     SPSS16.0 statistical packages on the measurement data for statistical analysis, using mean, standard deviation, single-factor analysis of variance and X~2 text (α=0.05).
     Results
     1. The inner diameters in different parts of patients with TOF measured by MSCT or TTE have no statistical difference (P>0.05).
     2. The inner diameters of different parts of pulmonary artery of patients with TOF or VSD have statistical difference (P<0.05).
     3. There is no statistical difference in display proximal end of pulmonary artery between MSCT and TTE(P>0.05). There has statistical difference in display distal end of pulmonary artery between MSCT and TTE (P<0.05).
     Conclusions
     1. MSCTA can not only make good diagnostic of qualitation but also make accurate diagnostic of quantitation, it has great mean to the choice of surgery and the evaluation of prognosis.
     2. MSCTA is a diagnostic method of CHD with safe, noninvasive, fast and accurate. It can almost instead of TTE and it is better than TTE in display extra-cardiac arteries like pulmonary artery.
引文
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