Serum triglycerides and mortality risk across stages of chronic kidney disease in 2 million U.S. veterans

Abstract

In the general population, elevated triglyceride (TG) levels are an important risk factor for cardiovascular disease and mortality. However, in chronic kidney disease, the association of serum TGs with mortality is less clear. We sought to examine the association of TGs with mortality across chronic kidney disease (CKD) stages in a large cohort of U.S. veterans. We examined 2,086,904 U.S. veterans with a TG measurement obtained between a baseline period of October 2004 and September 2006, with follow-up until December 2014 (median [interquartile range {IQR}]: 9.2 [6.5, 9.9] years). Associations of TGs with all-cause and cardiovascular mortality across CKD stages were evaluated using Cox proportional hazard models. Patients were 64±14years old with a median (IQR) baseline TG of 129 [88, 193] mg/dL and estimated glomerular filtration rate of 76 [61, 91] mL/min/1.73m2. More advanced CKD was associated with higher odds of TGs≥240mg/dL. Low levels of TGs<80mg/dL were associated with a higher risk of mortality across all stages, whereas TG levels≥240mg/dL were only associated with a higher risk of all-cause mortality in non-CKD and CKD stages 3A, 3B, and 4 (reference: TG 120 to <160mg/dL). The relationship of higher TGs with mortality incrementally attenuated across worsening stages of CKD and attenuated to the null among patients with CKD stage 5/end-stage renal disease. Similar results were observed for cardiovascular mortality, in strata by age and diabetes, and further adjustment for high-density lipoprotein and low-density lipoprotein. Associations of elevated TGs with all-cause and cardiovascular mortality were incrementally attenuated across more advanced stages of CKD.