This pattern is characterized by one of the following: Absent baseline HR variability plus recurrent late decelerations Absent baseline HR variability plus recurrent variable decelerations Absent baseline HR variability plus bradycardia (HR < 110 beats / minute without variability or < 100 beats / minute) Sinusoidal pattern (fixed variability of about 5 to 40 beats / minute at about 3 to 5 cycles / minute, resembling a sine wave) Abnormal patterns require prompt actions to correct them (eg, supplemental oxygen, repositioning, treatment of maternal hypotension, discontinuation of oxytocin) or preparation for an expedited delivery.