Background: The causal effects of individual risk factors of metabolic syndrome on erectile dysfunction (ED) are still unclear. Objectives: To evaluate the causal effect of risk factors of metabolic syndrome on ED through Mendelian randomization (MR). Materials and methods: Data for risk factors were obtained from multiple databases with 173,082–757,601 individuals, and that for ED were collected from a genome-wide association study including 223,805 Europeans. We performed univariate MR analysis using inverse-variance weighted, MR-Egger, weighted-median, weighted mode methods and multivariable MR analysis to evaluate the total and direct causal effects. Results: The univariable MR supported that type 2 diabetes mellitus (odds ratios [OR] = 1.14, 95% confidence intervals [CI]: 1.08–1.21, p < 0.001) and body mass index (BMI) (OR = 1.27, 95% CI: 1.12–1.44, p < 0.001) were associated with ED. After excluding the SNPs associated with BMI and other risk factors, the results of multivariable MR for T2D (OR = 1.15, 95% CI: 1.05–1.25, p = 0.001) remained consistent. However, the results of multivariable MR provided limited evidence for the causality between BMI and ED (OR = 1.06, 95% CI: 0.88–1.29, p = 0.532). For systolic blood pressure and lipid components (low-density lipoprotein, high-density lipoprotein and triglycerides), both univariable and multivariable MR failed to offer sufficient evidence to confirm their causal effect on ED. Conclusion: T2D showed a direct causal effect on ED independent of obesity and dyslipidemia.
CITATION STYLE
Yuan, C., Jian, Z., Gao, X., Jin, X., Wang, M., Xiang, L., … Wang, K. (2022). Type 2 diabetes mellitus increases risk of erectile dysfunction independent of obesity and dyslipidemia: A Mendelian randomization study. Andrology, 10(3), 518–524. https://doi.org/10.1111/andr.13132
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