title: Short-term effects of low-dose estradiol on endothelial function and blood viscosity in nondiabetic postmenopausal overweight women: a double-blind, placebo-controlled study.
abstract: The beneficial effects of estrogen on endothelial function depend on its integrity. This study evaluates the short-term effects of low-dose transdermal estradiol on endothelial function, insulin sensitivity, and blood viscosity in nondiabetic overweight/obese women.
  
  
  
  Forty-four nondiabetic overweight/obese women with a history of recent menopause were randomly allocated, in a double-blind fashion, to receive transdermal estradiol (1 mg/d, n = 22) or placebo (n = 22). The following parameters were assessed: endothelial reactivity (venous occlusion plethysmography and nailfold videocapillaroscopy), plasma levels of soluble adhesion molecules, insulin sensitivity (homeostasis model assessment of insulin resistance and areas under the curve of insulin and glucose during an oral glucose tolerance test), and blood and plasma viscosity. Data were expressed as means ± SD or medians [first to third quartiles].
  
  
  
  Participants were aged 51.8 ± 2.3 years with a body mass index of 31.5 ± 2.5 kg/m and time since menopause was 3 [2-5] years. At baseline, no differences between the groups were observed; however, after 3 months of treatment, the following changes were observed in the estradiol group compared with the placebo group: a decrease in the forearm vascular resistance at baseline (36.37 [24.9-51.27] vs 51.3 [40.88-70.03] mm Hg/mL per min 100 mL tissue, P < 0.01) and during the postocclusive reactive hyperemia response (15.93 [11.32-22.29] vs 22.13 [16.46-29.7] mm Hg/mL per min 100 mL tissue, P < 0.01), and an increase in red blood cell velocity at rest (0.316 [0.309-0.326] vs 0.303 [0.293-0.308] mm/s, P < 0.001) and during postocclusive reactive hyperemia response (0.374 [0.353-0.376] vs 0.341 [0.333-0.355] mm/s, P < 0.001). Furthermore, blood viscosity was lower in the estradiol group than in the placebo group (3.57 ± 0.12 vs 3.76 ± 0.22 mPa.s; P < 0.01).
  
  
  
  Short-term use of low-dose transdermal estradiol in nondiabetic overweight/obese women with a history of recent menopause improved endothelial function and decreased blood viscosity compared with placebo.
authors.affiliation: 1Clinical and Experimental Research Laboratory on Vascular Biology (BioVasc), Biomedical Center, State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil 2Division of Endocrinology, University Hospital of Santa Maria, Federal University of Santa Maria, Santa Maria, RS, Brazil 3Lipids Laboratory (LabLip), Policlínica Piquet Carneiro State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil 4Obesity Unit, Policlínica Piquet Carneiro, Division of Endocrinology, Department of Internal Medicine, Faculty of Medical Sciences, State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Diogo G
authors.initials: DG
authors.lastname: Panazzolo
authors.forename: Lucia H A
authors.initials: LH
authors.lastname: da Silva
authors.forename: Priscila A
authors.initials: PA
authors.lastname: Maranhão
authors.forename: Maria G C
authors.initials: MG
authors.lastname: Souza
authors.forename: José F
authors.initials: JF
authors.lastname: Nogueira Neto
authors.forename: Lenora M C S M
authors.initials: LM
authors.lastname: Leão
authors.forename: Eliete
authors.initials: E
authors.lastname: Bouskela
authors.forename: Luiz G
authors.initials: LG
authors.lastname: Kraemer-Aguiar
mesh_terms: D001809:Blood Viscosity / Q000187:drug effects; D003324:Coronary Artery Disease / Q000097:blood / Q000517:prevention & control*; D004311:Double-Blind Method; D004730:Endothelium, Vascular / Q000187:drug effects; D004958:Estradiol / Q000494:pharmacology / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D007333:Insulin Resistance; D008875:Middle Aged; D050177:Overweight; D017698:Postmenopause; D016896:Treatment Outcome
chemical_list: D004958:Estradiol