50 Chapter 3 Antenatal CTG classification CTG classification Baseline Heart Frequency (bpm) Accelerations and variability Decelerations Contractions Reassuring: The CTG complies with all criteria 110-150 Minimal two accelerations in a 45-minute CTG tracing Variability 5-25 bpm Absence of decelerations Maximum of two contractions per 10 minutes Absence of hypertonia Non-reassuring: The CTG deviates from one or more criteria <110 or >150 < two accelerations in a 45-minute CTG tracing Variability <5 or > 25 bpm Presence of 1 or more decelerations >two contractions per ten minutes Presence of hypertonia CTG, cardiotocography; bpm, beats per minute Figure 1: Antenatal CTG classification system used in the study
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