Impact of Metabolic Syndrome and It's Components on Prognosis in Patients With Cardiovascular Diseases: A Meta-Analysis

<b>Background:</b> Patients with metabolic syndrome (MetS) have a higher risk of developing cardiovascular diseases (CVD). However, controversy exists about the impact of MetS on the prognosis of patients with CVD. <b>Methods:</b> Pubmed, Cochrane library, and EMBASE databases were searched. Cohort Studies and randomized controlled trials <i>post hoc</i> analyses that evaluated the impact of MetS on prognosis in patients (≥18 years) with CVD were included. Relative risk (RR), hazard rate (HR) and 95% confidence intervals (CIs) were calculated for each individual study by random-effect model. Subgroup analysis and meta-regression analysis was performed to explore the heterogeneity. <b>Results:</b> 55 studies with 16,2450 patients were included. Compared to patients without MetS, the MetS was associated with higher all-cause death [RR, 1.220, 95% CI (1.103 to 1.349), <i>P</i>, 0.000], CV death [RR, 1.360, 95% CI (1.152 to 1.606), <i>P</i>, 0.000], Myocardial Infarction [RR, 1.460, 95% CI (1.242 to 1.716), <i>P</i>, 0.000], stroke [RR, 1.435, 95% CI (1.131 to 1.820), <i>P</i>, 0.000]. Lower high-density lipoproteins (40/50) significantly increased the risk of all-cause death and CV death. Elevated fasting plasma glucose (FPG) (>100 mg/dl) was associated with an increased risk of all-cause death, while a higher body mass index (BMI>25 kg/m²) was related to a reduced risk of all-cause death. <b>Conclusions:</b> MetS increased the risk of cardiovascular-related adverse events among patients with CVD. For MetS components, there was an increased risk in people with low HDL-C and FPG>100 mg/dl. Positive measures should be implemented timely for patients with CVD after the diagnosis of MetS, strengthen the prevention and treatment of hyperglycemia and hyperlipidemia.