Barreto Enoch Q, Milani Hérbene F, Araujo Júnior Edward, Haratz Karina K, Rolo Liliam C, Nardozza Luciano M, Guimarães Filho Hélio A, Moron Antonio F
Department of Obstetrics, São Paulo Federal University, São Paulo, SP, Brazil.
Cardiovasc Ultrasound. 2010 May 12;8:17. doi: 10.1186/1476-7120-8-17.
To assess the reliability of fetal heart volume measurement by three-dimensional sonography (3DUS) using the eXtended Imaging Virtual Organ Computer-aided AnaLysis (XI VOCAL) method.
This reliability study enrolled 30 pregnant women with singleton healthy pregnancies between 19 and 34 weeks of gestation. All volume acquirements were performed with a convex volumetric transducer (C3-7ED) coupled to an Accuvix XQ sonography device (Medison, Korea). The XI VOCAL 10 planes was the method of choice for volumetric measurement. 3D datasets were analyzed by two observers (EQSB and HJFM); fetal heart volume was measured twice by the first and once by the second observer to calculate intra and interobserver reproducibility. Statistical analysis used pareated Student's t test (p) and calculated Intraclass correlation coefficients (ICC). Bland-Altman plots were also constructed.
We observed an excellent intra- and interobserver reliability for fetal cardiac volume assessed by XI VOCAL. For the intraobserver the ICC was 0.998 (95% CI: 0.997; 0.999), with mean of differences of 0.12 cm3 (95% limits of agreement: -0.84; +0.84; p = 0.130). For interobserver the ICC was 0.899 (95%CI: 0.996; 0.998), mean of differences 0.05 cm3 (95% limits of agreement: -0.84; +0.84; p = 0.175).
Fetal cardiac volume assessed by 3DUS using XI VOCAL method is highly reproducible between 19 to 34 gestational weeks.
采用扩展成像虚拟器官计算机辅助分析（XI VOCAL）方法，评估三维超声（3DUS）测量胎儿心脏容积的可靠性。
本可靠性研究纳入了30例单胎健康妊娠孕妇，孕周为19至34周。所有容积采集均使用与Accuvix XQ超声设备（韩国麦迪逊公司）相连的凸阵容积探头（C3-7ED）进行。XI VOCAL 10平面法是容积测量的首选方法。3D数据集由两名观察者（EQSB和HJFM）进行分析；第一名观察者对胎儿心脏容积测量两次，第二名观察者测量一次，以计算观察者内和观察者间的可重复性。统计分析采用配对t检验（p）并计算组内相关系数（ICC）。还构建了布兰德-奥特曼图。
我们观察到，通过XI VOCAL评估的胎儿心脏容积在观察者内和观察者间具有出色的可靠性。观察者内ICC为0.998（95%CI：0.997；0.999），平均差异为0.12 cm³（95%一致性界限：-0.84；+0.84；p = 0.130）。观察者间ICC为0.899（95%CI：0.996；0.998），平均差异为0.05 cm³（95%一致性界限：-0.84；+0.84；p = 0.175）。
在19至34孕周之间，采用XI VOCAL方法通过3DUS评估的胎儿心脏容积具有高度可重复性。
