๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

A neural explanation of fetal heart rate patterns: A test of the polyvagal theory

โœ Scribed by Shawn F. Reed; Gonen Ohel; Rahav David; Stephen W. Porges

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
137 KB
Volume
35
Category
Article
ISSN
0012-1630

No coin nor oath required. For personal study only.

โœฆ Synopsis

The current study applies a neurophysiological model based on the Polyvagal Theory (Porges, 1995) to interpret fetal heart rate patterns. Beat-to-beat heart rate data from 7 fetuses monitored during the first and second stages of labor were analyzed. Transitory heart rate accelerations and reduced beat-to-beat variability reliably preceded heart rate decelerations. The data are interpreted within the context of the Polyvagal Theory, which provides a plausible explanation of the neurophysiological mechanisms that mediate fetal heart rate decelerations. Specifically, it is proposed that both the transitory heart rate accelerations and the depression of the respiratory rhythm in the beat-to-beat heart rate pattern reflect a withdrawal of the vagal tone determined by myelinated vagal pathways originating in the nucleus ambiguus. Functionally, withdrawal of vagal tone originating in the nucleus ambiguus results in the cardiac pacemaker becoming vulnerable to sympathetic influences and to the more-primitive unmyelinated vagal pathways originating in the dorsal motor nucleus of the vagus, which may contribute to clinically relevant bradycardia.

๐Ÿ“œ SIMILAR VOLUMES

Explanation of the patterns in Mie theor
Explanation of the patterns in Mie theory
โœ M.J. Berg; C.M. Sorensen; A. Chakrabarti ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 975 KB
Sleep state and vagal regulation of hear
Sleep state and vagal regulation of heart period patterns in the human newborn: An extension of the polyvagal theory
โœ Stephen W. Porges; Jane A. Doussard-Roosevelt; Cynthia A. Stifter; Bonita D. McC ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 196 KB

The influence of sleep state ~i.e., active and quiet! on heart period, heart period variability, respiratory sinus arrhythmia ~RSA!, and the coupling between RSA and heart period was evaluated in 24 healthy full-term newborns. Electrocardiogram ~ECG! data were collected, and sleep state was coded 1

Spatial pattern in catch rates: A test o
Spatial pattern in catch rates: A test of economic theory
โœ Ray Hilborn; Robert B. Kennedy ๐Ÿ“‚ Article ๐Ÿ“… 1992 ๐Ÿ› Springer ๐ŸŒ English โš– 619 KB

Gordon (1953, J. Fish. Res. Bd Can. 10, 442~457) used economic theory to predict how catch rates, price and fishing costs should balance in a multi-area, open-access fishery. We use the data from the Tasmanian rock lobster fishery to test this theory. We find that, as predicted by theory, areas wit

Prevalence of fetal heart rate decelerat
Prevalence of fetal heart rate decelerations in self-referred low-risk patients in the third trimester
โœ Janie Furer Geraci; Ronald A. Chez; Armando Fuentes ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 31 KB ๐Ÿ‘ 2 views

We tested the hypotheses that fetal heart rate decelerations are present during the third trimester in most low risk pregnant women, the prevalence of decelerations is a function of the length of time fetal heart rate monitoring occurs and their presence is not associated with an adverse prognosis.