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Published online: 2021-09-22
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Normal ranges of fetal heart rate values for healthy fetuses in Poland, as determined by ultrasound between weeks 18 and 29 of gestation

Oskar Sylwestrzak12, Aleksandra Nowakowska1, Julia Murlewska2, Maria Respondek-Liberska23
DOI: 10.33963/KP.a2021.0119
Affiliations
  1. Medical Faculty, Medical University of Lodz, Łódź, Poland
  2. Department for Prenatal Cardiology, Polish Mother’s Memorial Hospital Research Institute, Łódź, Poland
  3. Department of Diagnosis and Prevention Fetal Malformations, Medical University of Lodz, Łódź, Poland

open access

Online first
Original article
Published online: 2021-09-22

Abstract

Background: Fetal heart rate (FHR) is commonly used to assess fetal well-being.
Aims: The aim was to establish normal ranges of FHR during pregnancy by umbilical artery (UMB-A) Doppler analysis in a healthy Polish population.
Methods: The study was conducted in a tertiary center for fetal cardiology. Gestational age (GA), FHR measured on umbilical artery (UMB-A), cardiac problems and extracardiac problems were collected. All fetuses underwent echocardiographic examination. The inclusion criteria comprised normal fetal biometry and biophysical profile, labels of “normal heart anatomy and normal heart function”, “no extracardiac malformations” no “extracardiac
anomalies”.
Results: Based on the data from 258 healthy fetuses, a scatter graph with regression line giving a prognosis of normal values for FHR during pregnancy was prepared (95% confidence interval). The regression equation for FHR, as function of GA in weeks, was found to be:
FHR (beats/minute) = 149 – GA according to biometry (weeks) × 0.22; (r = –0.1032; P = 0.098)
FHR (beats/ minute) = 148 – GA according to last menstrual period (weeks) × 0.16; (r = –0.0722; P = 0.253)
The 5th, 50th, 95th percentiles, mean and standard deviation of FHR between weeks 18 and 29 of gestation were calculated.
Conclusions: We present the normal ranges for FHR measured on UMB-A for weeks 18 to 29 of gestation in healthy fetuses with normal heart function and anatomy. The obtained values may be of value to fetal and obstetrical departments and should be considered important elements of the basic fetal ultrasound report.

Abstract

Background: Fetal heart rate (FHR) is commonly used to assess fetal well-being.
Aims: The aim was to establish normal ranges of FHR during pregnancy by umbilical artery (UMB-A) Doppler analysis in a healthy Polish population.
Methods: The study was conducted in a tertiary center for fetal cardiology. Gestational age (GA), FHR measured on umbilical artery (UMB-A), cardiac problems and extracardiac problems were collected. All fetuses underwent echocardiographic examination. The inclusion criteria comprised normal fetal biometry and biophysical profile, labels of “normal heart anatomy and normal heart function”, “no extracardiac malformations” no “extracardiac
anomalies”.
Results: Based on the data from 258 healthy fetuses, a scatter graph with regression line giving a prognosis of normal values for FHR during pregnancy was prepared (95% confidence interval). The regression equation for FHR, as function of GA in weeks, was found to be:
FHR (beats/minute) = 149 – GA according to biometry (weeks) × 0.22; (r = –0.1032; P = 0.098)
FHR (beats/ minute) = 148 – GA according to last menstrual period (weeks) × 0.16; (r = –0.0722; P = 0.253)
The 5th, 50th, 95th percentiles, mean and standard deviation of FHR between weeks 18 and 29 of gestation were calculated.
Conclusions: We present the normal ranges for FHR measured on UMB-A for weeks 18 to 29 of gestation in healthy fetuses with normal heart function and anatomy. The obtained values may be of value to fetal and obstetrical departments and should be considered important elements of the basic fetal ultrasound report.

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Keywords

fetal echocardiography, fetal heart rate, prenatal, ultrasound, umbilical artery

About this article
Title

Normal ranges of fetal heart rate values for healthy fetuses in Poland, as determined by ultrasound between weeks 18 and 29 of gestation

Journal

Kardiologia Polska (Polish Heart Journal)

Issue

Online first

Article type

Original article

Published online

2021-09-22

DOI

10.33963/KP.a2021.0119

Keywords

fetal echocardiography
fetal heart rate
prenatal
ultrasound
umbilical artery

Authors

Oskar Sylwestrzak
Aleksandra Nowakowska
Julia Murlewska
Maria Respondek-Liberska

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