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Autonomic cardiovascular control in normal and pre-eclamptic pregnancy
E Eneroth-Grimfors1, M Westgren, M Ericson
1Department of Obstetrics and Gynecology, Södersjukhuset, Stockholm, Sweden.
Acta Obstetricia Et Gynecologica Scandinavica
|October 1, 1994
Summary
Pre-eclampsia is linked to reduced vagal control of the heart, indicating altered autonomic nervous system function. Pregnancy itself does not appear to significantly impact sympathovagal balance.
Area of Science:
- Cardiovascular physiology
- Autonomic nervous system research
- Reproductive medicine
Background:
- Pre-eclampsia is a placental disorder causing endothelial and cardiovascular issues.
- Disturbed neural cardiovascular control is suspected in pre-eclampsia and other hypertensive diseases.
Purpose of the Study:
- To non-invasively assess sympathovagal balance in normal and pre-eclamptic pregnancies.
Main Methods:
- Heart rate, blood pressure, and breathing were recorded in 12 healthy pregnant women, 13 pre-eclamptic women, and 10 non-pregnant controls.
- Autoregressive spectral analysis quantified heart rate variability (HRV) components.
- Student's t-test analyzed logarithmic values of HRV.
Main Results:
- Pre-eclamptic women showed significantly reduced high-frequency HRV (vagal tone) compared to healthy pregnant and non-pregnant groups.
- Low-frequency HRV (sympathetic tone) and blood pressure variability did not differ significantly between groups.
Conclusions:
- Pre-eclampsia is associated with diminished vagal control of the heart.
- Pregnancy itself does not alter the overall sympathovagal balance.