Menopausal hormone therapy and coronary heart disease: the roller-coaster history

In the USA it is estimated that more than one million women become menopausal each year. Coronary heart disease (CHD) is the leading cause of mortality in menopausal woman globally. The majority of perimenopausal to postmenopausal women experience bothersome symptoms including hot flashes, night sweats, mood liability, sleep disturbances, irregular bleeding and sexual dysfunction. While menopausal hormone therapy (HT) effectively treats most of these symptoms, use of HT has become confusing, especially related to CHD risk. Despite years of observational and retrospective studies supporting a CHD benefit and improved survival among HT users, the Heart and Estrogen/Progestin Replacement Study (HERS) and the Women's Health Initiative (WHI) raised doubts about this long-held premise. The timing hypothesis has since emerged and states that when HT is initiated in younger women, soon after menopause onset, there may be cardiovascular benefit. The following review discusses the roller-coaster history of HT use as it pertains to CHD in postmenopausal women. Studies that highlight HT's CHD benefit are reviewed and provide reassurance that HT utilized in appropriately selected younger postmenopausal women close to the onset of menopause is safe from a cardiovascular perspective, in line with consensus recommendations.

Meta-analysis of randomized controlled trials examining the safety and efficacy of bempedoic acid

Funding Acknowledgements

Type of funding sources: None.

Introduction

Bempedoic acid (BA), an inhibitor of ATP citrate lyase, has emerged as a new therapy for patients with dyslipidemia. The objective of this study was to perform a meta-analysis of BA's safety and cholesterol lowering efficacy.

Methods

A meta-analysis was performed using RCTs testing the safety and efficacy of BA versus placebo. The primary analysis calculated the odds ratio (OR) and 95% confidence interval (CI) of any adverse events, muscular-related AEs including myopathy, muscle weakness, and myalgias, as well as serious AEs as self-defined by the individual RCT. Additionally, we evaluated the mean difference (MD) and CI of low density lipoprotein-cholesterol (LDL-C), non-high density lipoprotein-cholesterol (non-HDL-C), total cholesterol (TC), and apolipoprotein B (ApoB) at 12 weeks, as well as LDL-C at 24 weeks of BA use as compared to placebo.

Results

Four RCTs were identified comparing BA to placebo. There was no increased risk of any AE [OR 1.04; 95%CI 0.89, 1.22], serious AE [OR 1.07; 95%CI 0.87, 1.34], or muscular-related AE [OR 1.25; 95%CI 0.98, 1.58] with BA use compared to placebo. BA resulted in a significant reduction in LDL-C [MD -21.06; 95%CI -24.49, -17.62], TC [MD -16.02; 95%CI -19.09, -12.93], non-HDL-C [MD -17.84; 95%CI -21.34, -14.34], and ApoB [MD -14.19; 95%CI -17.18, -11.21] at 12 weeks, and LDL-C at 24 weeks [MD -16.42; 95%CI -18.15, -14.69] compared to placebo.

Conclusion

In this meta-analysis testing BA versus placebo, BA significantly reduced levels of LDL-C, TC, non-HDL-C, and ApoB at 12 weeks and LDL-C at 24 weeks, and was not associated with an increased risk of any AE, muscular-related AE or serious AE. Further studies with longer time of follow up are needed to confirm the safety and long term cholesterol effects of BA.

Association between coronary artery vitamin D receptor expression and select systemic risks factors for coronary artery atherosclerosis

OBJECTIVE

The aim of this study is to analyze the association between coronary artery vitamin D receptor (VDR) expression and systemic coronary artery atherosclerosis (CAA) risk factors.

METHODS

Female cynomolgus monkeys (n = 39) consumed atherogenic diets containing the women's equivalent of 1000 IU/day of vitamin D₃. After 32 months consuming the diets, each monkey underwent surgical menopause. After 32 postmenopausal months, CAA and VDR expression were quantified in the left anterior descending coronary artery. Plasma 25OHD_3, lipid profiles and serum monocyte chemotactic protein-1 (MCP-1) were measured.

RESULTS

In postmenopausal monkeys receiving atherogenic diets, serum MCP-1 was significantly elevated compared with baseline (482.2 ± 174.2 pg/ml vs. 349.1 ± 163.2 pg/ml, respectively; p < 0.001; d = 0.79) and at the start of menopause (363.4 ± 117.2 pg/ml; p < 0.001; d = 0.80). Coronary VDR expression was inversely correlated with serum MCP-1 (p = 0.042). Additionally, the change of postmenopausal MCP-1 (from baseline to necropsy) was significantly reduced in the group with higher, compared to below the median, VDR expression (p = 0.038). The combination of plasma 25OHD₃ and total plasma cholesterol/high-density lipoprotein cholesterol was subsequently broken into low-risk, moderate-risk and high-risk groups; as the risk increased, the VDR quantity decreased (p = 0.04). CAA was not associated with various atherogenic diets.

CONCLUSION

Coronary artery VDR expression was inversely correlated with markers of CAA risk and inflammation, including MCP-1, suggesting that systemic and perhaps local inflammation in the artery may be associated with reduced arterial VDR expression.