REFERENCES
- Achiron R, Tadmor O. Screening for fetal anomalies during the first trimester of pregnancy: transvaginal versus transabdominal sonography. Ultrasound Obstet Gynecol 1991;1:186–91
- D’Amelio R, Giorlandino C, Masala L, et al. Fetal echocardiography using transvaginal and trans- abdominal probes during the first period of preg- nancy: a comparative study. Prenat Diagn 1991; 11:69–75
- Johnson P, Sharland G, Maxwell D, et al. The role of transvaginal sonography in the early detection of congenital heart disease. Ultrasound Obstet Gynecol 1992;2:248–51
- Hyett JA, Perdu M, Sharland GK, et al. Increased nuchal translucency at 10–14 weeks of gestation as a marker for major cardiac defects. Ultrasound Obstet Gynecol 1997;10:242–6
- Matías A, Gomes C, Flack N, Montenegro N, Nicolaides KH. Screening for chromosomal abnor- malities at 10–14 weeks: the role of ductus venosus blood flow. Ultrasound Obstet Gynecol 1998;12:380–4
- Hyett J, Perdu M, Sharland G, et al. Using fetal nuchal translucency to screen for major congenital cardiac defects at 10–14 weeks of gestation: population based cohort study. Br Med J 1999;318:81–5
- Matías A, Huggon I, Areias JC, Montenegro N, Nicolaides KH. Cardiac defects in chromosomally normal fetuses with abnormal ductus venosus blood flow at 10–14 weeks. Ultrasound Obstet Gynecol 1999; 14:307–10
- Devine PC, Simpson LL. Nuchal translucency and its relationship to congenital heart disease. Semin Perinatol 2000;24:343–51
- Bilardo CM, Müller MA, Zikulnig L, et al. Ductus venosus studies in fetuses at high risk for chromo- somal or heart abnormalities: relationship with nuchal translucency measurement and fetal out- come. Ultrasound Obstet Gynecol 2001;17:288–94
- Antolín E, Comas C, Torrents M, et al. The role of ductus venosus blood flow assessment in screening for chromosomal abnormalities at 10–16 weeks of gestation. Ultrasound Obstet Gynecol 2001;17:295–300
- Gembruch U, Knopfle G, Chatterjee M, et al. First- trimester diagnosis of fetal congenital heart disease by transvaginal two-dimensional and Doppler echo- cardiography. Obstet Gynecol 1990;75:496–8
- Bronshtein M, Siegler E, Yoffe N, et al. Prenatal diag- nosis of ventricular septal defect and overriding aorta at 14 weeks’ gestation using transvaginal sonography. Prenat Diagn 1990;10:697–705
- Bronshtein M, Zimmer EZ, Milo S, et al. Fetal cardiac abnormalities detected by transvaginal sonography at 12–16 weeks’ gestation. Obstet Gynecol 1991;78:374–8
- Gembruch U, Knöpfle G, Bald R, et al. Early diagnosis of fetal congenital heart disease by transvaginal echo- cardiography. Ultrasound Obstet Gynecol 1993;3:310–17
- Bronshtein M, Zimmer EZ, Gerlis LM, et al. Early ultrasound diagnosis of fetal congenital heart defects in high-risk and low-risk pregnancies. Obstet Gynecol 1993;82:225–9
- Achiron R, Rotstein Z, Lipitz S, et al. First-trimester diagnosis of fetal congenital heart disease by transvaginal ultrasonography. Obstet Gynecol 1994;84:69–72
- Carvalho JS. Early prenatal diagnosis of major con- genital heart defects. Curr Opin Obstet Gynecol 2001; 13:155–9
- Murta CG, Moron AF, de Avila MA. Detection of functional changes of the fetal heart in the first trimester of gestation. Arq Bras Cardiol 1999; 72:739–50Mavrides E, Cobian-Sanchez F, Tekay A, et al. Limita- tions of using first-trimester nuchal translucency measurement in routine screening for major congeni- tal heart defects. Ultrasound Obstet Gynecol 2001;17:106–10
- Huisman TWA, Bilardo CM. Transient increase in nuchal translucency thickness and reversed end- diastolic ductus venosus flow in a fetus with trisomy 18. Ultrasound Obstet Gynecol 1997;10:397–9
- Borrell A, Antolin E, Costa D, Farre T, Martinez JM, Fortuny A. Abnormal ductus venosus blood flow in trisomy 21 fetuses during early pregnancy. Am J Obstet Gynecol 1998;179:1612–17
- Dolkart LA, Reimers FT. Transvaginal fetal echo- cardiography in early pregnancy: normative data. Am J Obstet Gynecol 1991;165:688–91
- Gembruch U, Shi C, Smrcek JM. Biometry of the fetal heart between 10 and 17 weeks of gestation. Fetal Diagn Ther 2000;15:20–31
- Achiron R, Weissman A, Rotstein Z, et al. Trans- vaginal echocardiographic examination of the fetal heart between 13 and 15 weeks’ gestation in a low-risk population. J Ultrasound Med 1994;13:783–9
- Rustico MA, Benettoni A, D’ Ottavio G, et al. Early screening for fetal cardiac anomalies by transvaginal echocardiography in an unselected population: the role of operator experience. Ultrasound Obstet Gynecol 2000;16:614–19
- Baschat AA, Gembruch U, Knöpfle G, et al. First- trimester fetal heart block: a marker for cardiac anomaly. Ultrasound Obstet Gynecol 1999;14:311–14
- DeVore GR. Color Doppler examination of the out- flow tracts of the fetal heart: a technique for identifi- cation of cardiovascular malformations. Ultrasound Obstet Gynecol 1994;4:463–71
- Berg KA, Clark EB, Astemborski JA, et al. Prenatal detection of cardiovascular malformations by echo- cardiography: an indication for cytogenetic evalua- tion. Am J Obstet Gynecol 1988;69:494–7
- Schwanitz G, Zerres K, Gembruch U, et al. Prenatal detection of heart defects as an indication for chromo- some analysis. Ann Genet 1990;33:79–83
- Allan LD, Sharland GK, Chita SK, et al. Chromosomal anomalies in fetal congenital heart disease. Ultrasound Obstet Gynecol 1991;1:8–11
- Gembruch U, Baschat AA, Knopfle G, et al. Results of chromosomal analysis in fetuses with cardiac anoma- lies as diagnosed by first- and early second-trimester echocardiography. Ultrasound Obstet Gynecol 1997;10:391–6
- Lazanakis MS, Rodgers K, Economides DL. Increased nuchal translucency and CATCH 22. Prenat Diagn 1998;18:507–10