Category I to III tracings, baseline, variability, accelerations, early, variable and late decelerations, causes and intrauterine resuscitation measures.
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- What is the normal fetal heart rate (FHR) baseline range?
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110 to 160 beats per minute- How is baseline FHR defined on a tracing?
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The mean FHR rounded to the nearest 5 bpm during a 10-minute window, excluding accelerations, decelerations, and periods of marked variability- What baseline FHR defines fetal bradycardia?
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Baseline below 110 bpm- What baseline FHR defines fetal tachycardia?
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Baseline above 160 bpm- How is absent FHR variability defined?
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Amplitude range is undetectable- How is minimal FHR variability defined?
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Amplitude range is detectable but 5 bpm or less- How is moderate FHR variability defined?
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Amplitude range of 6 to 25 bpm- How is marked FHR variability defined?
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Amplitude range greater than 25 bpm- What defines an acceleration at 32 weeks gestation or beyond?
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An abrupt increase of at least 15 bpm above baseline, lasting at least 15 seconds but less than 2 minutes- What defines an acceleration before 32 weeks gestation?
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An abrupt increase of at least 10 bpm above baseline, lasting at least 10 seconds but less than 2 minutes- What duration makes an acceleration or deceleration 'prolonged'?
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Lasting at least 2 minutes but less than 10 minutes- What is the characteristic shape of an early deceleration relative to a contraction?
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A gradual decrease and return to baseline that mirrors the shape of the contraction- What causes early decelerations?
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Fetal head compression, triggering a vagal response- What onset-to-nadir timing characterizes a variable deceleration?
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Abrupt, with onset to nadir in less than 30 seconds- What depth and duration criteria define a variable deceleration?
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A decrease of at least 15 bpm below baseline, lasting at least 15 seconds but less than 2 minutes
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