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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]
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 ...
During uterine contractions, fetal oxygenation is worsened. Late decelerations in fetal heart rate occurring during uterine contractions are associated with increased fetal death rate, growth retardation and neonatal depression. [1] [2] This test assesses fetal heart rate in response to uterine contractions via electronic fetal monitoring.
The presence of these biophysical variables implies absence of significant central nervous system hypoxemia/acidemia at the time of testing. By comparison, a compromised fetus typically exhibits loss of accelerations of the fetal heart rate (FHR), decreased body movement and breathing, hypotonia, and, less acutely, decreased amniotic fluid volume.
increased or decreased fetal heart rate (tachycardia and bradycardia), especially during and after a contraction; decreased variability in the fetal heart rate; late decelerations; Biochemical signs, assessed by collecting a small sample of baby's blood from a scalp prick through the open cervix in labor fetal metabolic acidosis
A Doppler fetal monitor, informally known as sonicaid (generic trademark), is a hand-held ultrasound transducer used to detect the fetal heartbeat for prenatal care. It uses the Doppler effect to provide an audible simulation of the heart beat. Some models also display the heart rate in beats per minute (BPM).
[2] [3] The diagnosis should be suspected if there is a sudden decrease in the baby's heart rate during labor. [4] [2] Seeing or feeling the cord confirms the diagnosis. [4] Management focuses on quick delivery, usually by cesarean section. [4] Filling the bladder or pushing up the baby by hand is recommended until this can take place. [4]
Abnormal fetal heart tracing suggests that the fetus's heart rate has slowed during labor due to head compression, cord compression, hypoxemia or anemia. [3] Uterine tachysystole , the most common adverse effect of oxytocin (usually as a result of a problematic dosage), can result in nonreassuring fetal heart tracing.
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