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