In response to hypoxic stress, the fetus reduces its heart rate to preserve myocardial oxygenation and perfusion. The fetal heart rate is controlled by the autonomic and somatic nervous system. CTG: Accelerations Decelerationsĭecelerations are an abrupt decrease in the baseline fetal heart rate of greater than 15 bpm for greater than 15 seconds. The absence of accelerations with an otherwise normal CTG is of uncertain significance. The presence of accelerations is reassuring.Īccelerations occurring alongside uterine contractions is a sign of a healthy fetus. Prematurity: variability is reduced at earlier gestation (Drugs: opiates, benzodiazepines, methyldopa and magnesium sulphate. ![]()
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