Document Detail

Gestational age related changes in cardiac dynamics of the fetal baboon.
MedLine Citation:
PMID:  10088989     Owner:  NLM     Status:  MEDLINE    
To provide insight into the maturation of neural mechanisms governing fetal heart rate and rate variability, seven chronically instrumented fetal baboons were monitored under steady state conditions between 120 and 165 days gestation (term 175 d). Forty records of 24 h duration (5-7 records/fetus) were evaluated. For each fetus, heart rate decreased with gestational age (mean+/-SD, r = -0.530+/-0.324, P <0.05). In contrast, there were increases with age in markers of various components of autonomic control of fetal R-wave to R-wave interval (RRi) variability as reflected in a positive correlation with age for all fetuses of SD RRi (r = 0.656+/-0.347, P < 0.01), root mean squared differences in RRi (r = 0.686+/-0.223, P <0.05), and power at low frequency in the RRi spectrum (r = 0.800+/-0.161 P < 0.01). In each of the seven fetuses, scatter plots of RRi as a function of the prior RRi (Poincare plots) had increased dispersion around the median with gestational age (0.605+/-0.371, P<0.05). Additional measures of variability evaluated changes in RRi from one interval to the next (deltaRRi). The incidence of sustained deltaRRi changes, either decelerations or accelerations, rose with gestation (r = 0.920+/-0.057, P < 0.001) while the incidence of no detected deltaRRi changes (<+/-1 ms) diminished (r = - 0.649+/-0.364, P <0.05). Sequential decreases in fetal heart rate, increases in RRi variability and increases in changes in RRi and deltaRRi with age imply an overall maturation in autonomic cardio-regulatory control processes. Increases with gestation in measures of high frequency components of variability are compatible with enhanced parasympathetic modulation of fetal heart rate.
R I Stark; M M Myers; S S Daniel; M Garland; Y I Kim
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Early human development     Volume:  53     ISSN:  0378-3782     ISO Abbreviation:  Early Hum. Dev.     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-05-06     Completed Date:  1999-05-06     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7708381     Medline TA:  Early Hum Dev     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  219-37     Citation Subset:  IM    
Department of Pediatrics, Columbia College of Physicians and Surgeons, Columbia University, New York City, NY, USA.
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MeSH Terms
Gestational Age*
Heart / embryology*,  physiology*
Heart Rate, Fetal*
Papio / embryology*
Grant Support

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