Effects of synthetic progestagens on autonomic tone, neurohormones and C-reactive protein levels in young healthy females in reproductive age.
BACKGROUND
Heart rate variability and baroreceptor sensitivity are measures of autonomic control. While progestagen-containing replacement therapy in postmenopausal women adversely affects autonomic balance, the impact of hormonal contraceptives with synthetic progestagens on autonomic activity, neurohormones and C-reactive protein levels is not well characterized.


RESULTS
We analyzed parameters of heart rate variability and baroreceptor sensitivity in young healthy females without (n = 27) or on oral contraceptives with synthetic progestagens (n = 31). Demographic characteristics were not different among the examined groups. Total power (controls: 5682+/-3618 vs. hormones: 4800+/-2957 ms2; NS), standard deviation of beat-to-beat intervals (SDNN; 66+/-24 vs. 63+/-20 ms; p = 0.74), other time- and frequency-dependent parameters of heart rate variability and baroreceptor sensitivity (6.0+/-3.2 vs. 6.5+/-2.7 ms/mm Hg; NS) were not significantly different among the groups. Total cholesterol and triglyceride as well as C-reactive protein (CRP) levels were significantly higher in users of hormonal contraceptives than in non-users (cholesterol: 187+/-37 vs. 166+/-28 mg/dL; p = 0.05; triglycerides: 110+/-35 vs. 68+/-30 mg/dL; p = 0.01; CRP: 2.7+/-2.1 vs. 1.0+/-1.4 mg/L; p < 0.001). Heart rate variability, baroreceptor sensitivity, lipid parameters and CRP levels were not affected during the ovarian cycle in non-users of hormonal contraception.


CONCLUSIONS
The use of oral contraceptives containing synthetic progestagens was not associated with a modulation of autonomic tone, while lipid parameters and CRP levels were adversely affected. These data suggest that synthetic progestagens in modern oral contraceptives do not modulate the autonomic balance, but probably affect the atherogenic risk profile of young females in reproductive age.
Schueller
Per Otto
PO
Department of Cardiology, Heinrich Heine University Düsseldorf, Germany.
Feuring
Martin
M
Sharkova
Yulia
Y
Grimm
Wolfram
W
Christ
Michael
M
D000328:Adult; D001341:Autonomic Nervous System / Q000187:drug effects*; D002097:C-Reactive Protein / Q000032:analysis / Q000187:drug effects*; D003278:Contraceptives, Oral, Hormonal / Q000494:pharmacology*; D005260:Female; D006728:Hormones / Q000502:physiology; D006801:Humans; D011372:Progestins / Q000494:pharmacology*; D011446:Prospective Studies
D003278:Contraceptives, Oral, Hormonal; D006728:Hormones; D011372:Progestins; D002097:C-Reactive Protein