References
- Morris JK, Mutton DE, Alberman E. Revised estimates of the maternal age specific live birth prevalence of Down’s syndrome. J Med Screen. 2002;9(1):2–6.
- Roizen NJ, Patterson D. Down’s syndrome. Lancet. 2003;361(9365):1281–1289.
- Smith-Bindman R, Hosmer W, Feldstein VA, et al. Second-trimester ultrasound to detect fetuses with Down syndrome: a meta-analysis. JAMA. 2001;285(8):1044–1055.
- Agathokleous M, Chaveeva P, Poon LC, et al. Meta-analysis of second-trimester markers for trisomy 21. Ultrasound Obstet Gynecol. 2013;41(3):247–261.
- Flöck A, Remig I, Müller A, et al. Conflicting umbilical artery Doppler findings in fetuses with trisomy 21. Arch Gynecol Obstet. 2015;292(3):613–617.
- Wagner P, Sonek J, Hoopmann M, et al. Increased umbilical artery pulsatility index in third-trimester fetuses with trisomy 21. Fetal Diagn Ther. 2016;39(2):100–104.
- Clementi M, Calzolari E, Turolla L, et al. Neonatal growth patterns in a population of consecutively born Down syndrome children. Am J Med Genet. 1990;7:S71–S74.
- Weijerman ME, van Furth AM, Vonk Noordegraaf A, et al. Prevalence, neonatal characteristics, and first-year mortality of Down syndrome: a national study. J Pediatr. 2008;152(1):15–19.
- Bustos JC, Paublo M, Ramirez P, et al. Umbilical artery half peak systolic velocity deceleration time throughout pregnancy and its role in fetuses with bradycardia. Ultrasound Obstet Gynecol. 2007;30(7):952–957.
- Bustos JC, Gonzalez V, Sepulveda W. Umbilical artery half-peak systolic velocity deceleration time in fetal growth restriction. Fetal Diagn Ther. 2016;40(2):128–134.
- Bhide A, Acharya G, Bilardo CM, et al. ISUOG practice guidelines: use of Doppler ultrasonography in obstetrics. Ultrasound Obstet Gynecol. 2013;41(2):233–239.
- Acharya G, Wilsgaard T, Berntsen GK, et al. Reference ranges for serial measurements of umbilical artery Doppler indices in the second half of pregnancy. Am J Obstet Gynecol. 2005;192(3):937–944.
- Bustos JC, Gonzalez V. Reference ranges for umbilical artery pulsatility index and half peak systolic velocity deceleration time in a Chilean population [in Spanish]. Rev Chil Obstet Ginecol. 2014;79:255–261.
- Milad M, Novoa JM, Fabres J, et al. Recommendation on intrauterine growth curves [in Spanish]. Rev Chil Pediatr. 2010;81:264–274.
- Anonymous. Routine ultrasound in obstetrics. In: Crocco P, Robledo O, Troncoso P, et al., editors. Perinatal Guidelines. 2015. Santiago: Ministry of Health; 2015. p. 53–65 [in Spanish].
- Malassiné A, Frendo JL, Evain-Brion D. Trisomy 21-affected placentas highlight prerequisite factors for human trophoblast fusion and differentiation. Int J Dev Biol. 2010;54(2–3):475–482.
- Pidoux G, Gerbaud P, Cocquebert M, et al. Review: human trophoblast fusion and differentiation: lessons from trisomy 21 placenta. Placenta. 2012;33:S81–S86.
- Rochelson B, Kaplan C, Guzman E, et al. A quantitative analysis of placental vasculature in the third-trimester fetus with autosomal trisomy. Obstet Gynecol. 1990;75(1):59–63.
- Qureshi F, Jacques SM, Johnson MP, et al. Trisomy 21 placentas: histopathological and immunohistochemical findings using proliferating cell nuclear antigen. Fetal Diagn Ther. 1997;12(4):210–215.
- Kuhlmann RS, Werner AL, Abramowicz J, et al. Placental histology in fetuses between 18 and 23 weeks’ gestation with abnormal karyotype. Am J Obstet Gynecol. 1990;163(4 Pt 1):1264–1270.