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Fetal heart rate tracing patterns
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Category I
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Requires all the following criteria:
- Baseline 110-160/min
- Moderate variability (6-25/min)
- No late/variable decelerations
- ± Early decelerations
- ± Accelerations
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Category II
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- Not category I or III (indeterminate pattern)
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Category III
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≥1 of the following characteristics:
- Absent variability + recurrent late decelerations
- Absent variability + recurrent variable decelerations
- Absent variability + bradycardia
- Sinusoidal pattern
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