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 ?
One of the signals that acidosis is progressing to a moderate level (approximately 8 mmol/L) is the change in severe variable decelerations from typical (having shoulders, a sharp drop, and a sharp rise) to atypical (a loss of shoulders, a U-shaped variable deceleration, or a slow return to baseline).
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.
Three hours later, repetitive deep variable decelerations were noted.
The case series of Strong et al (26) describes 18 women who received amnioinfusion for the indications of oligohydramnios and/or deep variable decelerations during their trial of labor.
First, variable decelerations must be totally absent for an FHR tracing to be categorized as category I, in other words, normal.
Common causes of variable decelerations include vagal reflex triggered by head compression during pushing and cord compression such as that caused by short cord, nuchal cord, body entanglement, prolapsed cord, decreased amniotic fluid, and fetal descent.
Nevertheless, communication with the patient is key during variable decelerations.
On the other hand, the data do not support two prophylactic indications for amniotic fluid replacement--prevention of variable decelerations in the setting of oligohydramnios and prevention of meconium aspiration syndrome, said Dr.
The evidence is fairly strong that recurrent variable decelerations result from umbilical cord compression.