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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.