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Table 1 Classification of the fetal heart rate tracings. Based on FIGO 1987 guidelines [7, 28]

From: Cardiotocography in breech versus vertex delivery: an examiner-blinded, cross-sectional nested case-control study

Classification Basal heart rate (bpm) Baseline variability (bpm) Decelerations
Normal 110–150 5–25
Accelerations
Early uniform decelerations
Variable decelerations (duration <60 s and depth of <60 bpm)
Suspicious 100–110
150–170
<5
>25
Variable decelerations (duration <60 s and depth of <60 bpm)
Pathological >170
<100 for >3 min
<5 for >60 min
Sinusoidal pattern
Complicated variable decelerations (duration >60 s or depth >60 bpm)a
Late uniform decelerations
  1. aSee Fig. 1