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Table 1 Classification of cardiotocographic patterns according to FIGO-Guidelines

From: A randomised clinical trial on cardiotocography plus fetal blood sampling versus cardiotocography plus ST-analysis of the fetal electrocardiogram (STAN®) for intrapartum monitoring

Cardiotocographic classification Baseline heart frequency Variability Reactivity Decelerations
Normal 110–150 beats/min 5–25 beats/min
Accelerations
Early decelerations
Uncomplicated variable decelerations with a duration of < 60 sec and a beat loss of < 60 beats/min
Intermediary* 100–110 beats/min
150–170 beats/min
Short bradycardia episode
> 25 beats/min without accelerations
< 5 beats/min for > 40 min
Uncomplicated variable decelerations with a duration of < 60 sec and a beat loss of > 60 beats/min
Abnormal 150–170 beats/min and reduced variability
>170 beats/min
< 5 beats/min for > 60 min
Sinusoidal pattern
Repeated late decelerations
Complicated variable decelerations with a duration of > 60 sec
Preterminal Total lack of variability and reactivity with or without decelerations or bradycardia
  1. * Combination of several intermediary observations will result in an abnormal CTG.