Abstract:Objective To investigate the relationship of SAA and apolipoprotein B/A1 ratio with coronary artery lesions. Methods A total of 520 patients with chest pain admitted to our hospital from August 2017 to October 2018 were enrolled, including 191 patients with normal coronary artery and 329 with coronary artery thickening. Another 100 healthy persons were selected as control group. All the subjects underwent general investigation and coronary computed tomography angiography (CCTA) examination. The levels of serum amyloid A (SAA), apolipoprotein B (ApoB), apolipoprotein A1 (ApoA1) and other indexes were detected, and ApoB/A1 ratio was calculated. The correlation between the lesions of coronary artery and the levels of various indicators were analyzed by Pearson correlation analysis and Logistic regression. Results The systolic blood pressure, diastolic blood pressure, ApoB/A1 ratio, and levels of SAA and high-sensitivity C-reactive protein (hs-CRP) of the coronary artery thickening group were significantly higher than those of the normal coronary artery group, while those of the normal coronary artery group were higher than those of the control group (P?0.05). Pearson correlation analysis showed that the number of coronary artery lesions and the stenosis degree of coronary artery were positively correlated with hs-CRP level (rs?=0.247, 0.253, P?0.05), SAA level (rs?=0.397, 0.674, P?0.05), ApoB/A1 ratio (rs?=0.402, 0.650, P < 0.05) and systolic blood pressure (rs?=0.116, 0.141, P?0.05), while CT values of coronary artery plaque were negatively correlated with SAA level (rs?=-0.295, P?0.05 ) and ApoB/A1 ratio (rs?=-0.279, P?0.05). Logistic regression analysis showed that the most significant affecting factors for the coronary artery lesions were ApoB/A1 ratio [OlR=24.768, (95% CI: 6.270, 97.841)] and SAA level [OlR=1.956, (95% CI: 1.446, 2.647)]. Conclusions In coronary artery disease, the level of SAA and ApoB/A1 ratio are closely related to coronary arterial lesions and reflect the condition of coronary atherosclerosis.