The Pathophysiology of CTGs and Types of Intrapartum Hypoxia

ISSN: 1875-6581 (Online)
ISSN: 1573-4048 (Print)

Volume 13, 2 Issues, 2017

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Current Women's Health Reviews

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John Yeh
Harvard Medical School
Department of Obstetrics and Gynecology
Massachusetts General Hospital
Boston, MA

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The Pathophysiology of CTGs and Types of Intrapartum Hypoxia

Current Women's Health Reviews, 9(3): 158-168.

Author(s): Sian McDonnell and Edwin Chandraharan.

Affiliation: Consultant Obstetrician and Gynaecologist, St. George’s Healthcare NHS Trust, Blackshaw Road, London SW 17 0RE, UK.


The introduction of intrapartum fetal monitoring has failed to achieve one of its major goals - to reduce perinatal morbidity and mortality secondary to intrapartum hypoxic events. Despite this, it remains at common place in labour wards around the world. Although there is now a much greater understanding of fetal physiology and the fetus’ normal adaptation in labour, there continues to be around 500 intrapartum stillbirths in the UK each year, many with avoidable factors that are related to cardiotocograph (CTG) misinterpretation. This review article aims to consider the mechanisms for the control of the fetal heart rate as well as features of a normal CTG. It also discusses the physiology behind abnormal fetal heart rate patterns in labour and by explaining these changes in terms of physiological mechanisms, it is hoped that readers will better understand how the fetus adapts in labour and hence guide appropriately timed intervention rather than intervention based purely upon pattern recognition.


Birth asphyxia, cardiotocograph, decelerations, fetal monitoring, hypoxia, labour, physiology.

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Article Details

Volume: 9
Issue Number: 3
First Page: 158
Last Page: 168
Page Count: 11
DOI: 10.2174/157340480903140131111654
Price: $58
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