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目的:探讨急性冠状动脉综合征（ACS）患者血浆氧化三甲胺（TMAO）水平与病情严重程度的相关性。方法:回顾性分析2018年6月至2019年6月湖北省天门市第一人民医院心血管内科ACS患者200例（ACS组）和因胸部不适检查未发现冠状动脉明显病变患者90例（对照组）的临床资料。采用稳定同位素稀释高效液相色谱串联谱分析法检测血浆TMAO水平；应用彩色超声检查左心室射血分数（LVEF）、左心室内径（LAD）、左心室后壁收缩末期厚度（PWS）和左心室后壁舒张末期厚度（LVPWT）。利用受试者工作特征（ROC）曲线分析血浆TMAO对ACS的诊断价值，相关性采用Pearson相关分析。结果:ACS组TMAO、LAD、PWS和LVPWT明显高于对照组[（6.33 ± 1.31）μmol/L比（3.75 ± 1.11）μmol/L、（39.63 ± 8.89）mm比（31.90 ± 8.79）mm、（12.88 ± 1.76）mm比（7.00 ± 1.27）mm和（13.45 ± 2.51）mm比（8.97 ± 2.00）mm]，LVEF明显低于对照组[（44.63 ± 10.00）%比（59.71 ± 11.58）%]，差异有统计学意义（n P<0.01）。ROC曲线分析结果显示，当血浆TMAO最佳临界值为4.83 μmol/L时，AUC为0.942，诊断ACS敏感度和特异度分别为87.50%和88.89%；血浆TMAO最佳临界值为4.66 μmol/L时，AUC为0.908，诊断早期ACS敏感度和特异度分别为88.00%和83.33%。相关性分析结果显示，ACS患者血浆TMAO与LVEF呈负相关（n r=- 0.715，n P<0.01），与LAD、PWS和LVPWT呈正相关（n r= 0.715、0.746和0.729，n P<0.01）。n 结论:ACS患者血浆TMAO水平明显升高，与心功能水平相关；血浆TMAO水平可作为ACS的早期诊断和病情严重程度评估的指标。“,”Objective:To investigate the correlation between the plasma trimethylamine oxide (TMAO) level and the disease severity in patients with acute coronary syndrome (ACS).Methods:The clinical data of 200 patients with ACS (ACS group) and 90 chest discomfort patients without obvious coronary artery disease (control group) in Department of Cardiology Medicine, the First People′s Hospital of Tianmen City, Hubei Province, from June 2018 to June 2019 were retrospectively analyzed. The plasma TMAO level were detected by high performance liquid chromatography tandem spectroscopy with stable isotope dilution. Left ventricular ejection fraction (LVEF), left ventricle diameter (LAD), left ventricular posterior wall end-systolic thickness (PWS) and left ventricular posterior wall end-diastolic thickness (LVPWT) were examined by color ultrasound. The diagnostic value of plasma TMAO for ACS was analyzed by receiver operating characteristic (ROC) curve. Correlation was analyzed by Pearson correlation analysis.Results:The TMAO, LAD, PWS and LVPWT in ACS group were significantly higher than those in control group: (6.33 ± 1.31) μmol/L vs. (3.75 ± 1.11) μmol/L, (39.63 ± 8.89) mm vs. (31.90 ± 8.79) mm, (12.88 ± 1.76) mm vs. (7.00 ± 1.27) mm and (13.45 ± 2.51) mm vs. (8.97 ± 2.00) mm, the LVEF was significantly lower than that in control group: (44.63 ± 10.00)% vs. (59.71 ± 11.58)%, and there were statistical differences ( n P<0.01). ROC curve analysis result showed that when the optimal cutoff value of plasma TMAO was 4.83 μmol/L, the area under curve (AUC) was 0.942, and its sensitivity and specificity for diagnosing ACS were 87.50% and 88.89%; when the optimal cutoff value of plasma TMAO was 4.66 μmol/L, the AUC was 0.908, and its sensitivity and specificity of early diagnosis of ACS were 88.00% and 83.33%. The correlation analysis result showed that the plasma TMAO had negative correlation with LVEF in patients with ACS (n r=-0.715, n P<0.01), and positive correlation with LAD, PWS and LVPWT (n r=0.715, 0.746 and 0.729; n P<0.01).n Conclusions:The plasma TMAO level in patients with ACS is significantly increased, which is related to the level of heart function. Plasma TMAO can be used as an indicator of early diagnosis and severity assessment of ACS.