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The normal preterm foetal heart rate pattern

M Mathai1, S Vijaykumar, R Joseph

  • 1Department of Obstetrics & Gynaecology, Christian Medical College Hospital, Vellore.

The Indian Journal of Medical Research
|March 1, 1995
PubMed
Summary
This summary is machine-generated.

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Fetal heart rate monitoring during pregnancy shows a significant decrease in baseline heart rate and an increase in accelerations as gestation progresses. These changes in cardiotocography patterns are normal findings in low-risk pregnancies.

Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Cardiotocography

Background:

  • Cardiotocography (CTG) is a non-invasive method to assess fetal well-being.
  • Understanding normal CTG changes throughout gestation is crucial for accurate interpretation.

Purpose of the Study:

  • To investigate the longitudinal changes in cardiotocography parameters in low-risk pregnancies.
  • To establish normative data for fetal heart rate, variability, and accelerations during different gestational periods.

Main Methods:

  • A longitudinal study involving 38 women with low-risk pregnancies.
  • Cardiotocography performed from 27-28 weeks gestation until delivery, with increasing frequency closer to term.
  • Standardized analysis of CTG recordings by a single, blinded investigator.

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Main Results:

  • A statistically significant decrease in mean baseline fetal heart rate from 27-30 weeks to term (P < 0.001).
  • A significant increase in the number of fetal heart rate accelerations with advancing gestation (P = 0.002).
  • No significant changes observed in fetal heart rate variability or decelerations with increasing gestational age.

Conclusions:

  • Normal pregnancy is characterized by a decreasing baseline fetal heart rate and increasing accelerations as gestation progresses.
  • These findings provide valuable reference ranges for fetal heart rate patterns in low-risk pregnancies.
  • Cardiotocography remains a key tool for monitoring fetal health throughout pregnancy.