Reference intervals of embryos/fetuses heart rate between 6 and 14 weeks of pregnancy. (September 2014)

• Record Type: Journal Article
• Authors: Araujo Júnior, Edward; Costa, Raquel Silva; Fonseca, Bruna Custódio; Martins, Wellington P.; Pires, Claudio Rodrigues; Zanforlin Filho, Sebastião Marques
• Is Part Of: Journal of maternal-fetal & neonatal medicine. Volume 27:Number 13(2014)
• Page Start: 1385
• Page End: 1388
• Publication Date: 2014-09
• Subjects: Obstetrics -- Periodicals; Perinatology -- Periodicals; Infants (Newborn) -- Diseases -- Periodicals; Neonatology -- Periodicals; 618.2
• DOI: 10.3109/14767058.2013.856416
• Languages: English
• ISSNs: 1476-7058

Abstract

<abstract> <title>Abstract</title> <p> <italic>Objective</italic>: To determine reference intervals for the embryos/fetuses heart rate (HR) between 6 and 14 weeks of pregnancy.</p> <p> <italic>Methods</italic>: A retrospective cross-sectional study was carried in a single center with singleton pregnancies of embryos/fetuses with a crown-rump length (CRL) between 5 and 85 mm. The HR was assessed by real time M-mode or spectrum Doppler ultrasound. To evaluate the correlation between embryo/fetal HR and CRL, polynomial equations were calculated, with adjustment by the determination coefficient (<italic>R</italic>²).</p> <p> <italic>Results</italic>: A total of 5867 pregnancies were assessed. The mean gestational age was 10.37 ± 2.12 weeks. The mean maternal age was 26.41 ± 6.78 years. The mean embryo/fetal HR (bpm) for the CRL (mm) intervals 5├15; 15├25; 25├35; 35├45; 45├55; 55├65; 65├75; 75├85 was 145.1 ± 18.7; 167.2 ± 10.1; 166.9 ± 8.7; 165.5 ± 6.9; 162.2 ± 6.8; 159.2 ± 6.4; 157.1 ± 6.4; 154.9 ± 7.3; respectively. The following third-order equation best represented the correlation between embryo/fetal HR and CRL: HR = 119.25 + 3.596*CRL-0.07954*CRL²+ 0.00051*CRL³ (<italic>R</italic>²= 0.36).</p> <p> <italic>Conclusion</italic>: Reference intervals of HR in embryos/fetuses in a large sample were determined. These reference intervals can be used in high-risk early pregnancy losses.</p> </abstract>