Fetal Heart Rate

Fetal Heart Rate

Fetal

HeartRate

Trisomy

Tachycardia

Triploidy

TurnersSyndrome

In normal pregnancy, the fetal heart rate (FHR) increases from about 100 bpm at 5 weeks of gestation to 170 bpm at 10 weeks and then decreases to 155 bpm by 14 weeks. At 10–13+6 weeks, trisomy 13 and Turner syndrome are associated with tachycardia, whereas in trisomy 18 and triploidy there is fetal bradycardia (Figure 5; Liao et al 2001). In trisomy 21, there is a mild increase in FHR.

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