The Fetal Monitoring Central System
with SisPorto™ Automated Analysis



Alert Examples

Blue Attention Alerts


Related to conditions that are not usually associated with fetal hypoxia but may deserve some action on the part of health professionals.


The “Excessive uterine contractions” alert should motivate the evaluation of an eventual oxytocin induction/augmentation of labour and suggests careful monitoring for the appearance of hypoxemia-related changes in the fetal heart rate.



Yellow and Orange Alerts

These alerts signify the occurrence of fetal heart rate events that are not normal, but which by themselves are also not specific of fetal hypoxia.

  • Absent accelerations can be caused by drugs administered to the mother or by fetal hypoxemia.
  • Possible causes for isolated tachycardia and baseline shifts are maternal hyperthermia, intra-uterine infection, drugs administered to the mother and hypoxemia. On their own, they do not suggest fetal hypoxia, but should motivate the attempt to correct/treat the underlying situation.
  • Basal bradychardia is very rare and can be caused by maternal hypothermia or fetal heart dysrhythmias.
  • Decelerations can be caused by fetal head compression, transient fetal hypertension caused by umbilical cord compression or transient hypoxemia. 
  • The simultaneous appearance of repetitive decelerations and low variability suggests some hypoxic risk, and a lower threshold for intervention in probably appropriate in these situations.

As hypoxemia is a possible cause of these changes efforts should be made to uncover and to correct causal or contributing situations (mother lying on her back, maternal hypotension, uterine hyper contractility).

If CTG changes do not revert rapidly, fetal ECG with ST analysis or FBS can be considered.





Red Alerts

These alerts are associated with a high probability of central fetal hypoxia, and should elicit an action from health professionals for the immediate reversal of a cause of hypoxia or the rapid removal from the intra-uterine environment. Other factors must also be taken into account, such as gestational age, maternal hyperthermia, administered drugs, intra-uterine growth restriction, previous CTG patterns, etc.





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