Variations from morning to afternoon of middle cerebral and umbilical artery blood flow, and fetal heart rate variability, and fetal characteristics in the normally developing fetus

2017 ◽  
Vol 46 (4) ◽  
pp. 235-240 ◽  
Author(s):  
Tehila Avitan ◽  
Ari Sanders ◽  
Ursula Brain ◽  
Dan Rurak ◽  
Tim F Oberlander ◽  
...  
Keyword(s):  
Heart Rate ◽  
Blood Flow ◽  
Heart Rate Variability ◽  
Fetal Heart Rate ◽  
Umbilical Artery ◽  
Fetal Heart ◽  
Artery Blood Flow ◽  
Fetal Heart Rate Variability

Heart rate and flow velocity variability as determined from umbilical Doppler velocimetry at 10–20 weeks of gestation

1998 ◽  
Vol 95 (5) ◽  
pp. 539-545 ◽  
Author(s):  
Nicolette T. C. URSEM ◽  
Piet C. STRUIJK ◽  
Wim C. J. HOP ◽  
Edward B. CLARK ◽  
Bradley B. KELLER ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Flow Velocity ◽  
Fetal Heart Rate ◽  
Umbilical Artery ◽  
Parasympathetic Nervous System ◽  
Fetal Heart ◽  
Peak Systolic Velocity ◽  
Fetal Heart Rate Variability ◽  
Artery Flow

1.The aim of this study was to define from umbilical artery flow velocity waveforms absolute peak systolic and time-averaged velocity, fetal heart rate, fetal heart rate variability and flow velocity variability, and the relation between fetal heart rate and velocity variables in early pregnancy. 2.A total of 108 women presenting with a normal pregnancy from 10 to 20 weeks of gestation consented to participate in a cross-sectional study design. Doppler ultrasound recordings were made from the free-floating loop of the umbilical cord. 3.Umbilical artery peak systolic and time-averaged velocity increased at 10–20 weeks, whereas fetal heart rate decreased at 10–15 weeks of gestation and plateaued thereafter. Umbilical artery peak systolic velocity variability and fetal heart rate variability increased at 10–20 and 15–20 weeks respectively. 4.The inverse relationship between umbilical artery flow velocity and fetal heart rate at 10–15 weeks of gestation suggests that the Frank–Starling mechanism regulates cardiovascular control as early as the late first and early second trimesters of pregnancy. A different underlying mechanism is suggested for the observed variability profiles in heart rate and umbilical artery peak systolic velocity. It is speculated that heart rate variability is mediated by maturation of the parasympathetic nervous system, whereas peak systolic velocity variability reflects the activation of a haemodynamic feedback mechanism.

Effect of Magnesium on Fetal Heart Rate Variability Using Computer Analysis

1995 ◽  
Vol 12 (04) ◽  
pp. 259-261 ◽  
Author(s):  
Adam Hiett ◽  
Lawrence Devoe ◽  
Haywood Brown ◽  
Joy Watson
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Computer Analysis ◽  
Fetal Heart Rate ◽  
Fetal Heart ◽  
Fetal Heart Rate Variability

A comparison of methods for quantitating fetal heart rate variability

1977 ◽  
Vol 128 (4) ◽  
pp. 381-392 ◽  
Author(s):  
Russell K. Laros ◽  
Wilson S. Wong ◽  
David C. Heilbron ◽  
Julian T. Parer ◽  
Sol M. Shnider ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Fetal Heart Rate ◽  
Fetal Heart ◽  
Comparison Of Methods ◽  
Fetal Heart Rate Variability
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