Evaluating the impact of chronic kidney disease and the triglyceride-glucose index on cardiovascular disease: mediation analysis in the NHANES

This study explores the intricate relationship between Chronic Kidney Disease (CKD), the Triglyceride-Glucose (TyG) index, and Cardiovascular Disease (CVD) in a U.S. adult population. It focuses on understanding how the TyG index, as a marker of insulin resistance, relates to cardiovascular risk in the presence of CKD. A cross-sectional analysis was conducted using data from the National Health and Nutrition Examination Survey (NHANES) spanning from 1999 to 2018. The study involved classifying stages of CKD, calculating the TyG index, and applying statistical analyses including logistic regression. The investigation revealed that individuals with CKD, who comprised 49% males with an average age of 47 years, exhibited a higher incidence of CVD. The study demonstrated that before adjusting for the TyG index, the odds ratio (OR) for the association between CKD and CVD was 1.77. Importantly, the TyG index was found to mediate 10% of the association between CKD and CVD. Moreover, a significant synergistic interaction was observed between a high TyG index and CKD, with the combined presence of these conditions increasing the risk ratio for CVD to 3.01. The findings highlight the crucial role of insulin resistance in the link between CKD and CVD. The paper discusses the implications of chronic inflammation and endothelial dysfunction in CKD patients and the importance of the TyG index in assessing cardiovascular risk.