Fetal distress patterns

a. Fetal distress is likely to cause fetal or neonatal death or damage if left uncorrected. Fetal distress patterns are associated with fetal acidemia and hypoxemia.

b. Undulating baseline. Alternating tachycardia and bradycardia, often with reduced variability between the wide swings in heart rate.

c. Severe bradycardia. Fetal heart rate below 100 bpm for a prolonged period of time (ie, at least 10 minutes).

d. Tachycardia with diminished variability that is unrelated to drugs or additional non-reassuring periodic patterns (eg, late decelerations or severe variable decelerations)

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