A fetal scalp electrode was then placed, and fetal variable decelerations
The significance of antepartum variable decelerations
. Am J Obstet Gynecol 1986; 155: 707-10.
In a study we published this year with colleagues in Canada, we found that severe variable decelerations
result in an increase in base deficit of 0.5 mmol/L per minute of cord occlusion.
Deep variable decelerations
occurred and the Pitocin was stopped at 7:53 a.m.
Abnormal- FHR >180 or <100 bpm: variability <5 for >90 minutes: Non-reassuring variable decelerations
still observed 30 minutes after starting conservative measures and occurring with over 50% of contractions or late decelerations present for over 30 minutes that does not improve with conservative measures and occurring with over 50% of contractions or bradycardia or a single prolonged deceleration lasting 3 minutes or more.
For example, the sudden onset of recurrent, significant variable decelerations
is more concerning in the context of a prior cesarean delivery, and late decelerations are more concerning in a patient with placental abruption, fetal growth restriction, or poorly controlled maternal diabetes.
The evidence is fairly strong that recurrent variable decelerations
result from umbilical cord compression.
During labor, the staff documented late, variable decelerations
with periods of minimal or undetectable variability on the fetal heart-rate monitor.
in reactive non-stress tests with decreased amniotic fluid index predict fetal compromise" Am J Obstet Gynecol 1991; 165: 1094-8.
Fetal heart rate data were not analyzed, but rates of amnioinfusion (a "reasonable proxy" for variable decelerations
) were similar, according to Dr.
Early first stage was uneventful, but at 6-cm to 8-cm cervical dilation, the baby developed some variable decelerations
. During the second stage the fetus developed late decelerations, and the vertex failed to descend.
After 4 hours, the FHR tracing reveals minimal variability with occasional variable decelerations
. The obstetrician is informed but issues no specific instructions.