Increased C-reactive protein levels during short-term hormone replacement therapy in healthy postmenopausal women.
OBJECTIVE
To study the short-term effect of unopposed oestradiol (E2) and sequentially combined hormone replacement therapy (E2 + P) on C-reactive protein (CRP) in healthy postmenopausal women.


METHODS
Prospective, randomised, placebo-controlled 12-week study. Sixty healthy. normotensive, non-hysterectomised postmenopausal women received either placebo (N = 16) or daily 2 mg micronised oestradiol, either unopposed (N = 16, E2 group) or sequentially combined with a progestagen on 14 days of each cycle (N = 28, E2+P group). Data were collected at baseline and at 4 and 12 weeks.


RESULTS
CRP levels increased significantly during the 12 weeks in the E2 and the E2+P groups compared to placebo. No differences were found between the E2 group and the E2+P group [E2 and E2+P group together (N = 44) versus placebo: P = 0.01; E2 versus E2+P: P = 0.75]. To give a quantitative estimate of the increase, the median change calculated from baseline in both treatment groups together was +87% (P = 0.02) at 4 weeks, and +114% (P = 0.08) at 12 weeks, as compared to the placebo group.


CONCLUSIONS
In healthy postmenopausal women, short-term treatment with E2 or E2+P was associated with a rapid rise in CRP concentrations. These observations raise the possibility that the increased risk of cardiovascular events is related to an initial increase in CRP levels after starting hormone replacement therapy.
van Baal
W M
WM
Institute for Cardiovascular Research-Vrije Universiteit (ICAR-VU), Department of Obstetrics and Gynaecology, University Hospital Vrije Universiteit, Amsterdam, The Netherlands.
Kenemans
P
P
van der Mooren
M J
MJ
Kessel
H
H
Emeis
J J
JJ
Stehouwer
C D
CD
D002097:C-Reactive Protein / Q000378:metabolism*; D002318:Cardiovascular Diseases / Q000097:blood / Q000209:etiology; D004958:Estradiol / Q000008:administration & dosage / Q000009:adverse effects; D005260:Female; D020249:Hormone Replacement Therapy / Q000009:adverse effects*; D006801:Humans; D008875:Middle Aged; D017698:Postmenopause; D011372:Progestins / Q000008:administration & dosage; D011446:Prospective Studies; D012307:Risk Factors
D011372:Progestins; D004958:Estradiol; D002097:C-Reactive Protein