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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