A normal fetal heart rate (FHR) typically ranges from 120-160 beats per minute (bpm) during the period of the uterus. It is measured sonographically from around 6 weeks and the normal range is varied during pregnancy, increasing to around 170 bpm at 10 weeks, and declined since then to around 130 bpm at term.
Although the myocardium began to contract rhythmically by 3 weeks after conception (of spontaneous depolarization of the pacemaker cells in the embryonic heart infarction) was first seen on sonography about 6 weeks of pregnancy. DJJ then usually around 100 to 120 beats per minute (bpm)
FHR then increase progressively over the next 2-3 weeks to 7 :.
This is followed by a decrease in FHR to be average.
Despite the healthy fetal heart rate usually regularly, variations in the beat-to-beat about 5 to 15 beats per minute can be allowed
a fetal heartbeat is slow is called and is usually defined as 1:
a fetal heart rate quickly called and is usually defined as:
a fetal heart rapid and irregular rate is typically termed a
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