What causes variable decelerations in fetus?
Variable decelerations happen when the baby’s umbilical cord is temporarily compressed. This happens during most labors. The baby depends on steady blood flow through the umbilical cord to receive oxygen and other important nutrients.
What is the significance of variable decelerations?
The results suggest that in the presence of variable decelerations: there is a higher incidence of fetal distress in labor, low Apgar scores, neonatal intensive care unit admissions, and nuchal cord involvement; the presence of accelerations and normal variability is associated with good neonatal outcome, whereas their …
What causes absent variability?
Etiologies of decreased variability: Fetal metabolic acidosis [7], CNS depressants[8,9], fetal sleep cycles[10], congenital anomalies, prematurity [11,12], fetal tachycardia, preexisting neurologic abnormality [13], normal [14], betamethasone[15].
What is a typical variable deceleration?
Pure variable decelerations are typical variable decelerations without signs of atypia. They consist of an initial acceleration, rapid deceleration of the fetal heart rate to the nadir, followed by rapid return to the baseline fetal heart rate level with secondary acceleration.
How do you know if your baby has acidemia?
Diagnosing fetal acidosis
- Doppler ultrasonography.
- Fetal heart rate monitoring.
- Umbilical cord blood gas test.
- The biophysical profile (BPP) score, which is composed of the following tests/measurements: A nonstress test (NST) Measurement of the amniotic fluid index/volume (AFI/AFV) using ultrasound.
What causes uncomplicated decelerations?
Abrupt changes are generally the result of a baroreceptor effect. If the deceleration occurs with a contraction and recovers by the end of the it; the deceleration is almost certainly an uncomplicated variable resulting from a baroreceptor mediated response.