Vasomotor symptoms and fracture risk
9 February, 2015
Vasomotor symptoms (VMS) are common, but whether VMS are associated with fracture incidence or bone mineral density (BMD) levels is unknown. The following data are derived from the Women's Health Initiative Clinical Trial participants (n= 23,573) aged 50–79 years not using menopausal hormone therapy, and 4867 participants of the BMD sub-study [1]. This was a prospective observational study with mean (standard deviation) follow-up of 8.2 (1.7) years (1993–2005). Baseline VMS, incident adjudicated fractures, and BMD (baseline, annual visits 1, 3, 6, and 9) were measured. The mean age of those with moderate/severe VMS was 60 years, and mean body mass index (BMI) was 30.7 kg/m2. After adjustment for baseline age, BMI, race/ethnicity, smoking, and education, the hazard ratio for hip fracture among women with baseline moderate/severe VMS (vs. no VMS) was 1.78 (95% confidence interval, CI 1.20–2.64;p= 0.01). There was no association between VMS and vertebral fracture. VMS severity was inversely associated with BMD during follow-up (p= 0.004 for femoral neck,p= 0.045 for lumbar spine). In repeated measures models, compared with women who reported no VMS, women with moderate/severe VMS had 0.015 g/cm2lower femoral neck BMD (95% CI -0.025 to -0.005) and 0.016 g/cm2lower lumbar spine BMD (95% CI -0.032 to -0.004).
Comment
Although this seems quite strange, but as Crandall and colleagues state and a PubMed search verifies, the associations between VMS and fracture risk have not been frequently investigated. Previous studies examined the potential relationship of VMS and BMD, and indeed most found that women with more severe VMS had lower BMD values. Gast and colleagues analyzed data from a population-based sample of 5,600 women, aged 46–57 years and free from bone diseases, who participated in the first cross-sectional part of the Eindhoven Perimenopausal Osteoporosis Study between 1994 and 1995 [2]. They rated the degree of menopausal symptoms and correlated it with spine BMD results, and demonstrated that, after multivariate adjustments for age, BMI, menopause status, smoking, education, exercise, and hormone use, women with the highest frequency of symptoms had a 0.022 g/cm (95% CI -0.03 to -0.01) lower BMD compared with asymptomatic women. Women who reported having the highest frequency of night sweats had a 0.011 g/cm (95% CI -0.02 to -0.001) lower BMD compared with women with no symptoms of night sweats. Interestingly, the same investigators were able to establish similar associations with coronary artery disease: women with menopausal night sweats had a significantly moderately increased risk which could not be totally explained by the levels of cardiovascular risk factors: multivariable-adjusted hazard ratio 1.33 (95% CI 1.05–1.69), attenuated but not eliminated after correction for BMI, blood pressure, and total cholesterol (hazard ratio 1.25; 95% CI 0.99–1.58) [3]. However, symptoms of flushing were not associated with risk of coronary artery disease.
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