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  • Maternal pulse...

Maternal pulse recording during childbirth prevents encephalopathy in newborn babies

Written By : Dr. Kamal Kant Kohli Published On 2024-02-06T17:30:30+05:30  |  Updated On 6 Feb 2024 5:30 PM IST
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Cardiotocography (CTG) refers to the electronic recording of the fetal heart rate and uterine contractions. Fetal heart rate recorded through the mother's abdomen is the most commonly used fetal monitoring method during childbirth. Now, a research team from the University of Helsinki and Helsinki University Hospital (HUS) has found that external fetal heart rate monitoring without simultaneous maternal pulse recording is associated with both an increased risk of neonatal encephalopathy and acidemia in fetal umbilical artery blood, i.e., critically low pH and base excess concentrations. Acidemia increases the need for newborn resuscitation and the length of intensive care.

The study, published in the esteemed American Journal of Obstetrics and Gynecology, analysed almost 214,000 spontaneous full-term births in HUS maternity hospitals between 2005 and 2023.

The study included the largest CTG dataset ever published.

The study demonstrated that a newborn monitored during labour with external fetal heart rate monitoring alone had a 1.6-fold risk of neonatal encephalopathy and a 2.3-fold risk of severe umbilical cord blood acidemia compared to those monitored with an internal electrode attached to the skin of the fetal head (internal monitoring) or by concurrent external fetal heart rate monitoring and maternal pulse recording.

"Especially during the second stage of labour, when mothers tend to display increased heart rate while pushing, fetuses more commonly exhibit heart rate decelerations. Consequently, the fetal heart rate can be quite easily mixed with the maternal pulse, in which case abnormal fetal heart rate tracing, indicating fetal hypoxia, may go unnoticed by professionals," says Researcher Mikko Tarvonen, describing the challenges of external CTG monitoring.

In the majority of the labours in the study (38%), solely external monitoring was used.

Internal monitoring was the second most common method (33%), followed by external monitoring simultaneously with maternal pulse recording (29%).

Years of safer practice at HUS

The world's largest organisations of obstetricians and midwives recommend in their fetal monitoring guidelines that external fetal heart rate monitoring be used as the primary CTG registration method.

However, the new study indicates that, without simultaneous maternal pulse recording, this method is a significant risk factor predisposing the fetus to labour-related hypoxia and its long-term neurological effects.

"Based on our results, this tragedy can be effectively prevented by combining maternal pulse recording with fetal heart rate monitoring. This method allows professionals to be sure of whose heart rate they are monitoring," says Tarvonen.

In 2019 HUS adopted a new protocol emphasising the necessity of recording maternal heart rate alongside fetal heart rate during childbirth.

"Practices have long varied at Finnish maternity hospitals, but training and research evidence have resulted in a shift in attitudes and thus the increased use in recent years of maternal pulse monitoring," Tarvonen notes.

The present study demonstrated that, based on the incidence of neonatal encephalopathy, external fetal heart rate monitoring combined with maternal heart rate recording is equally as safe as internal fetal monitoring.

However, internal monitoring was the most accurate way of assessing fetal wellbeing.

Its use was associated with the lowest incidence of hypoxia-related neonatal outcomes.

The incidence of both neonatal encephalopathy and severe umbilical artery blood acidemia has decreased significantly in the HUS region during the study's 18-year follow-up period.

"This trend is exceptional even by international standards," Tarvonen points out.

Facts: Monitoring the wellbeing of the unborn child through cardiotocography (CTG)

  • Cardiotocography (CTG) refers to the electronic recording of the fetal heart rate and uterine contractions. CTG registration is used for the early identification and prevention of fetal hypoxia during labour.
  • In Finland and other industrialised countries, CTG registration is the most common technique for fetal surveillance performed routinely in hospital births.
  • CTG registration can be performed during labour in three ways: 1) by monitoring the fetal heart rate with an external ultrasound transducer attached to the mother's abdomen, 2) by both an external ultrasound transducer monitoring the fetal heart rate and simultaneous maternal pulse recording, and 3) with an internal electrode attached to the skin of the fetal head.
  • The latest CTG displays enable recording the maternal pulse through a uterine contraction transducer, meaning no additional sensors are needed.

Reference:

Mikko Tarvonen, Janne Markkanen, Ville Tuppurainen, Riina Jernman, Vedran Stefanovic, Sture Andersson. Intrapartum cardiotocography with simultaneous maternal heart rate registration improves neonatal outcome. American Journal of Obstetrics and Gynecology, 2024; DOI: 10.1016/j.ajog.2024.01.011.

American Journal of Obstetrics and Gynecologychildbirthencephalopathy
Source : American Journal of Obstetrics and Gynecology
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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