Triglyceride glucose index is a useful marker for predicting subclinical coronary artery disease in the absence of traditional risk factors

Background Atherosclerotic cardiovascular (CV) events commonly occur in individuals with a low CV risk burden. This study evaluated the ability of the triglyceride glucose (TyG) index to predict subclinical coronary artery disease (CAD) in asymptomatic subjects without traditional CV risk factors (CVRFs). Methods This retrospective, cross-sectional, and observational study evaluated the association of TyG index with CAD in 1250 (52.8 +/- 6.5 years, 46.9% male) asymptomatic individuals without traditional CVRFs (defined as systolic/diastolic blood pressure >= 140/90 mmHg; fasting glucose >= 126 mg/dL; total cholesterol >= 240 mg/dL; low-density lipoprotein cholesterol >= 160 mg/dL; high-density lipoprotein cholesterol < 40 mg/dL; body mass index >= 25.0 kg/m(2); current smoking; and previous medical history of hypertension, diabetes, or dyslipidemia). CAD was defined as the presence of any coronary plaque on coronary computed tomographic angiography. The participants were divided into three groups based on TyG index tertiles. Results The prevalence of CAD increased with elevating TyG index tertiles (group I: 14.8% vs. group II: 19.3% vs. group III: 27.6%; P < 0.001). Multivariate logistic regression models showed that TyG index was associated with an increased risk of CAD (odds ratio [OR] 1.473, 95% confidence interval [CI] 1.026-2.166); especially non-calcified (OR 1.581, 95% CI 1.002-2.493) and mixed plaques (OR 2.419, 95% CI 1.051-5.569) (all P < 0.05). The optimal TyG index cut-off for predicting CAD was 8.44 (sensitivity 47.9%; specificity 68.5%; area under the curve 0.600; P < 0.001). The predictive value of this cut-off improved after considering the non-modifiable factors of old age and male sex. Conclusions TyG index is an independent marker for predicting subclinical CAD in individuals conventionally considered healthy.