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  • Title: First trimester embryonic/fetal heart rate in normal pregnant women.
    Author: Hanprasertpong T, Phupong V.
    Journal: Arch Gynecol Obstet; 2006 Aug; 274(5):257-60. PubMed ID: 16715287.
    Abstract:
    OBJECTIVE: To establish reference ranges for first trimester embryonic/fetal heart rate in normal pregnant women. MATERIALS AND METHODS: This was a cross-sectional study. We performed ultrasonogram in 319 normal pregnant women, gestation age between 6(+0) and 14(+6) weeks and measured embryonic/fetal heart rates using M-mode. The embryonic/fetal heart rates were analyzed according to gestational ages (GA). RESULTS: Data of 319 pregnancies were analyzed and the outcome revealed the mean of fetal heart rate according to gestational age. The mean embryonic heart rates during the 6th-7th week of gestation are lower when compared with the other gestational ages. At the 8th week of gestation, the embryonic heart rate is maximum. Then the embryonic/fetal heart rate gradually decreased to 161 beats/min at the 14th week of gestation. The regression equation for embryonic/fetal heart rate (beat/min) [y] according to GA (day) [x] was y = -53.124 + 6.1333x + (-0.0407)x ( 2 )(r (2) = 0.525; P < 0.001). CONCLUSION: Embryonic/fetal heart rates during the 6(+0) and 14(+6) week of gestation are related to GA. Our reference ranges may be useful for further studies such as for prediction of adverse pregnancy outcome in threatened abortion.
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