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  • Title: [Evaluation of the embryonic and foetal heart rate at 6(+0) to 11(+6) weeks of gestation].
    Author: Hamela-Olkowska A, Wiech K, Jalinik K, Zaryjewski D, Kornatowski L, Dangel J.
    Journal: Ginekol Pol; 2009 Mar; 80(3):188-92. PubMed ID: 19382610.
    Abstract:
    OBJECTIVE: To establish the normal range of embryonic heart rate (EHR) and foetal heart rate (FHR) at 6(+0) to 11(+6) weeks of gestation, to evaluate the risk of pregnancy loss depending on EHR and FHR values and to establish if checking of FHR with the use of M-mode method is possible in different levels obstetric departments. MATERIAL AND METHODS: Transvaginal or transabdominal ultrasound using M-mode in 255 singleton pregnancies. Maternal age varied between 16 and 44 years (mean 29 +/- 5 years). There were 67% primigravidas. Gestational week was established on the basis of CRL measurements. Demographic factors, obstetrical history and follow-up were collected. Data was statistically reviewed. RESULTS: FHR varied between 47 and 192 bpm (mean 154 +/- 26 bpm). At 6 weeks, mean EHR was 116 +/- 21 bpm, then slowly increased, reaching mean 172 +/- 9 bpm at 10 weeks. At 11 weeks the mean FHR achieved the level of 165 +/- 7 bpm. The difference was statistically significant. The r-correlation ratio between FHR and the gestational week was 0.58. In case of 7 embryos (2.75%) at 6.1 to 8.1 weeks of gestation slow FHR was noted (< 100 bpm). The scan performed 7-10 days later revealed miscarriages in all cases. CONCLUSIONS: EHR and FHR in the first trimester depends on gestational week. It increases since 6 to 9 weeks and decreases after 10 weeks. The highest values of FHR are observed between 9 and 10 weeks of gestation. The risk of early pregnancy loss increases significantly in case of detecting slow FHR. FHR can be checked by M-mode methods using any kind of ultrasound machine.
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