Which is a cause of variable fetal heart rate (FHR)decelerations?

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Variable decelerations can occur any time during the uterine contracting phase and are caused by compression of the umbilical cord.Altered fetal cerebral blood flow would result in early decelerations in the FHR.Uteroplacental insufficiency would result in late decelerations in the FHR.Fetal hypoxemia would result in tachycardia initially and then bradycardia if hypoxia continues.

Which Is a Cause of Variable Fetal Heart Rate (FHR)decelerations