Abstract:Objective To explore the predictive performance of novel inflammatory-metabolic markers for acute coronary syndrome (ACS) in patients with coronary heart disease.Methods A total of 308 patients with coronary heart disease admitted to Dongguan Huangjiang Hospital were enrolled between June 2022 and June 2025. All patients underwent coronary angiography and were divided into the stable group (236 cases, stable coronary heart disease) and the unstable group (72 cases, ACS) according to the angiographic findings. The clinical data and novel inflammatory-metabolic markers [lymphocyte-to-high-density lipoprotein cholesterol ratio (LHR), systemic inflammatory response index (SIRI), neutrophil-to-lymphocyte ratio (NLR) ] in the two groups were compared. The risk factors for ACS were analyzed, and predictive value of LHR, SIRI and NLR in ACS was analyzed by receiver operating characteristic (ROC) curves.Results The stable group showed significantly lower age, LHR, SIRI, and NLR, and higher high-density lipoprotein cholesterol (HDL-C) levels and a higher proportion of Gensini score < 20 compared with the unstable group (all P < 0.05). Multivariable stepwise logistic regression analysis revealed that elevated LHR [O^R = 2.784 (95% CI: 1.410, 5.497) ], elevated SIRI [O^R = 3.040 (95% CI: 1.478, 6.254) ], elevated NLR [O^R = 2.643 (95% CI: 1.474, 4.740) ], and a higher Gensini score [O^R = 2.020 (95% CI: 1.320, 3.090) ] were independent risk factors for ACS in patients with coronary heart disease (all P < 0.05). ROC curve analysis showed that the combined model of LHR, SIRI, NLR, and Gensini score had the highest predictive performance for ACS, with an area under the curve of 0.858 (95% CI: 0.815, 0.901), sensitivity of 86.11% (95% CI: 0.781, 0.941), and specificity of 70.34% (95% CI: 0.645, 0.762).Conclusion LHR, SIRI, and NLR are important factors associated with the occurrence of ACS in patients with coronary heart disease and may serve as novel inflammatory-metabolic biomarkers for predicting ACS in clinical practice.