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A normal nonstress test will show a baseline fetal heart rate between 110 and 160 beats per minute with moderate variability (5- to 25-interbeat variability) and 2 qualifying accelerations in 20 minutes with no decelerations. "Reactive" is defined as the presence of two or more fetal heart rate accelerations within a 20-minute period. Each ...
The term is also sometimes used to designate late decelerations of fetal heart rate as measured by cardiotocography or an NST, even if there is no other evidence of reduced blood flow to the placenta, normal uterine blood flow rate being 600mL/min.
Week 17 – onward Invasive Fetal blood sample from umbilical cord ~3 days Chromosomal abnormalities, blood disorders (fetal hemolytic disease) Miscarriage (1–2%), preterm labor/delivery, infection, bleeding, decreased fetal heart rate, premature rupture of amniotic membrane, death Preimplantation genetic diagnosis (PGD) (screen) [19]
Normal (2 points) Abnormal (0 points) NST/Reactive FHR At least two accelerations in 20 minutes Less than two accelerations to satisfy the test in 20 minutes US: Fetal breathing movements At least one episode of > 30s or >20s [3] in 30 minutes None or less than 30s or 20s [3] US: Fetal activity / gross body movements
Fetal heart rate is continuously monitored for slow or abnormal heart rate patterns which may indicate fetal distress during labor. [7] If the exposed blood vessels are near the cervix or are at risk of rupturing, the newborn may be delivered via caesarean section as early as 35 weeks gestation.
Her heart rate began to climb and soon Ezra's followed. "They had always said that the twins would let us know when it was time to go," she said. Ezra's heart rate told them that at 26 weeks ...
A Zigzag pattern of fetal heart rate (FHR) is defined as FHR baseline amplitude changes of more than 25 beats per minute (bpm) with a minimum duration of 2 minutes and maximum of 30 minutes. [19] However, according to another study, even a >1 min duration of the zigzag pattern is associated with an increased risk of adverse neonatal outcomes. [21]
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