variable deceleration


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Related to variable deceleration: late deceleration

var·i·a·ble de·cel·er·a·tion

transient fetal bradycardia usually denoting compression of the umbilical cord, which may occur at any time in relation to a uterine contraction.

variable deceleration

Obstetrics A fetal heart response that is asynchronous with respect to uterine contractions; the curves of VDs on the fetal heart monitor are angled and saw-toothed and may be caused by compromised placental blood flow–eg, umbilical cord compression and, like late decelerations, may signify delivery-related difficulties. See Fetal heart monitor. Cf Uniform deceleration.
References in periodicals archive ?
The significance of antepartum variable decelerations.
Fetal bradycardia and variable decelerations were found almost twice as often in the group with nuchal cords (18.
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.
After 6 hours, she develops uterine tachysystole with recurrent variable decelerations but the oxytocin infusion is continued at the same rate (FIGURE 6).
The evidence is fairly strong that recurrent variable decelerations result from umbilical cord compression.
Initially, both have Category 1 tracings but, approximately 1 hour later, both tracings are noted to have minimal variability with variable decelerations, with a nadir at 80 bpm that lasts 30 to 45 seconds.
An emergency cesarean delivery should have been performed when variable decelerations were seen on tracings.
Criteria include a baseline rate of 110-160 beats per minute, moderate baseline variability, and the absence of late or variable decelerations.
And there should have been no more than 2 variable decelerations exceeding 60 seconds and decreasing more than 60 bpm from baseline in the previous 30 minutes.
Severe variable decelerations caused cerebral blood flow fluctuations that led to the hemorrhage.
While antenatal diagnosis optimizes outcome among women with known vasa praevia, undiagnosed cases will still occur, presenting in labour with variable decelerations and palpable vessels with intact membranes, and or intrapartum vaginal bleeding accompanied by acute fetal distress at the time of membrane rupture.