References
- Moore KL, Torchia MG, Persaud TV (eds). Before we are born–essentials of embryology and birth defects. 7th ed. Philadelphia: Saunders/Elsevier; 2008
- Wheeler T, Murrills A. Patterns of fetal heart rate during normal pregnancy. Br J Obstet Gynaecol 1978;85:18–27
- Oztekin D, Oztekin O, Aydal FI, et al. Embryonic heart rate as a prognostic factor for chromosomal abnormalities. J Ultrasound Med 2009;28:609–14
- Doubilet PM, Benson CB, Chow JS. Outcome of pregnancies with rapid embryonic heart rates in the early first trimester. AJR Am J Roentgenol 2000;175:67–9
- Liao AW, Snijders R, Geerts L, et al. Fetal heart rate in chromosomally abnormal fetuses. Ultrasound Obstet Gynecol 2000;16:610–13
- Tannirandorn Y, Manotaya S, Uerpairojkit B, et al. Reference intervals for first trimester embryonic/fetal heart rate in a Thai population. J Obstet Gynaecol Res 2000;26:367–72
- Hamela-Olkowska A, Wiech K, Jalinik K, et al. Ocena rytmu serca zarodka i płodu między 6+0 a 11+6 tygodniem ciąży [Evaluation of the embryonic and foetal heart rate at 6 (+0) to 11 (+6) weeks of gestation]. Ginekol Pol 2009;80:188–92 (in Polish)
- A miscigenação no Brasil. Available from URL: http://www.geledes.org.br/em-debate/sueli-carneiro/1826-a-miscigenacao-racial-no-brasil [last accessed 18 August 2000]
- Duck FA. Is it safe to use diagnostic ultrasound during the first trimester? Ultrasound Obstet Gynecol 1999;13:385–8
- American Institute of Ultrasound in Medicine/National Electrical Manufactures Association. Standards for real-time display of thermal and mechanical acoustic output indices on diagnostic equipment. 2nd ed. Rockville, MD: AIUM; 1998
- Altman DG, Chitty LS. Charts of fetal size I: methodology. Br J Obstet Gynaecol 1994;101:29–34
- Varelas FK, Prapas NM, Liang RI, et al. Yolk sac size and embryonic heart rate as prognostic factors of first trimester pregnancy outcome. Eur J Obstet Gynecol Reprod Biol 2008;138:10–13
- Arleo EK, Troiano RN. Outcome of early first-trimester pregnancies (<6.1 weeks) with slow embryonic heart rate. AJR Am J Roentgenol 2011;197:252–5
- Papaioannou GI, Syngelaki A, Maiz N, et al. Ultrasonographic prediction of early miscarriage. Hum Reprod 2011;26:1685–92
- As características gerais da população, religião e pessoas com deficiência do Censo Demográfico 2010. Available from: http://www.ibge.gov.br/home/estatistica/populacao/censo2010/caracteristicas_religiao_deficiencia/default_caracteristicas_religiao_deficiencia.shtm [last accessed 29 June 2012]
- Hanprasertpong T, Phupong V. First trimester embryonic/fetal heart rate in normal pregnant women. Arch Gynecol Obstet 2006;274:257–60
- Histórico da investigação sobre cor ou raça nas pesquisas domiciliares do IBGE. Available from: http://www.ibge.gov.br/home/estatistica/populacao/caracteristicas_raciais/notas_tecnica294s.pdf [last accessed 3 May 2013]