Triglyceride/high density lipoprotein cholesterol index and future cardiovascular events in diabetic patients without known cardiovascular disease

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Abstract
The triglyceride/high-density lipoprotein cholesterol (TG/HDL-C) index, calculated as TG divided by HDL-C, has been suggested as a predictor of cardiovascular disease (CVD). We investigated the association between the TG/HDL-C index and CVD events in type 2 diabetes mellitus (T2DM) patients with retinopathy and hyperlipidemia but no known CVD, enrolled in the EMPATHY study, which compared intensive and standard statin therapy (targeting LDL-C levels < 70 mg/dL and ≥ 100 to < 120 mg/dL, respectively). A total of 4665 patients were divided into high (TG/HDL-C ≥ 2.5, n = 2013) and low (TG/HDL-C < 2.5, n = 2652) TG/HDL-C index groups. During a median follow-up of 36.8 months, 260 CVD events occurred. The high TG/HDL-C index group had higher CVD risk than the low group (HR 1.89, 95% CI 1.45–2.47, p < 0.001). This association remained consistent across subgroups. A trend toward interaction between TG/HDL-C index and statin treatment allocation for CVD risk was observed (p for interaction = 0.062). Intensive statin treatment reduced CVD risk in the high TG/HDL-C group but not in the low group. In conclusion, a TG/HDL-C index ≥ 2.5 was associated with higher CVD risk in T2DM patients with retinopathy and hyperlipidemia without a history of CVD. The TG/HDL-C index may identify patients who benefit from intensive statin treatment.
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