Korean Circ J.  2005 Jul;35(7):547-552. 10.4070/kcj.2005.35.7.547.

The Different Abnormalities of Autonomic Nervous Modulation and Instability of Fetal Heart Rate According to Different Etiologies of Intrauterine Growth Restriction

• Cho HJ
• Kim CR
• Kim NS
• Yum MK
• Park EY
• Kim JH

• KMID: 1769294
• DOI: http://doi.org/10.4070/kcj.2005.35.7.547

Abstract

BACKGROUND AND OBJECTIVES
The purpose of this study was to examine whether the different etiologies of intrauterine growth restriction (IUGR) produce different autonomic nervous modulation and instability of the fetal heart rate (FHR) regulation.
SUBJECTS AND METHODS
We investigated the frequency-domain variability and instability in the FHR from 150 uneventful pregnancies (control group), 47 pregnancies with idiopathic IUGR (iIUGR group) and 48 with IUGR associated with severe pre-eclampsia of the mother (PEIUGR group). The FHR was analyzed for the power spectrum and very short-term intermittency (C1alpha), which are used to quantify the instability in FHR.
RESULTS
Compared to the control group, the iIUGR group showed significantly increased low- and high-frequency powers (LFP and HFP, respectively). In contrast, the PEIUGR group showed significantly decreased LFP and LFP/HFP ratio, but significantly increased C1alpha compared to the control and iIUGR groups.
CONCLUSION
The IUGR of an idiopathic cause produces abnormally increased the autonomic modulation of the FHR. In contrast, the IUGR due to pre-eclampsia abnormally decreased the autonomic modulation in the low-frequency range, but increased the instability of the fetal heart rate regulation.

Keyword

Pre-eclampsia; Intrauterine growth retardation; Autonomic nervous system; Fetal heart rate

MeSH Terms

Autonomic Nervous System
Female
Fetal Growth Retardation
Fetal Heart*
Heart Rate, Fetal*
Humans
Mothers
Pre-Eclampsia
Pregnancy