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目的:探讨中性粒细胞/淋巴细胞比值（NLR）联合可溶性生长刺激表达基因2蛋白（sST2）对中重度急性一氧化碳中毒（ACOP）心肌损伤患者发生院内主要心血管不良事件（MACE）的预测价值。方法:采用单中心前瞻性观察性研究方法，选择2016年11月至2020年2月河北医科大学哈励逊国际和平医院急救医学部收治的中重度ACOP合并心肌损伤患者作为研究对象，收集患者的基线资料、入院时NLR、sST2和入院3 d sST2以及其他心肌损伤相关生化指标。根据是否发生MACE将患者分为MACE组和非MACE组，比较两组患者临床资料的差异；各项指标的相关性采用Pearson相关性分析法；采用二元Logistic回归分析影响中重度ACOP心肌损伤患者发生院内MACE的独立危险因素；绘制受试者工作特征曲线（ROC曲线），计算ROC曲线下面积（AUC），分析NLR、sST2单独以及二者联合检测对中重度ACOP心肌损伤患者发生院内MACE的预测价值。结果:278例中重度ACOP心肌损伤患者纳入最终分析，MACE发生率11.51%（32/278）。MACE组心肌肌钙蛋白I（cTnI）、血乳酸（Lac）、NLR、入院3 d sST2均明显高于非MACE组〔cTnI（μg/L）：0.83±0.15比0.46±0.37，Lac（mmol/L）：2.96±1.14比2.43±1.35，NLR：13.14±4.37比9.49±4.21，入院3 d sST2（μg/L）：59.88±23.42比39.83±12.60，均 P<0.01〕，MACE组与非MACE组入院时sST2比较差异无统计学意义（μg/L：269.09±90.89比240.14±113.02， P>0.05）。Pearson相关性分析显示，NLR与急性生理学与慢性健康状况评分Ⅱ（APACHEⅡ）、入院3 d sST2与APACHEⅡ评分、NLR与入院3 d sST2均呈显著正相关（ r值分别为0.226、0.209、0.193，均 P<0.01）。二元Logistic回归分析显示，入院3 d sST2和NLR均是影响中重度ACOP心肌损伤患者发生院内MACE的独立危险因素〔优势比（ OR）和95%可信区间（95% CI）分别为1.064（1.039~1.090）、1.176（1.066~1.298），均 P<0.01〕。ROC曲线分析显示，NLR联合入院3 d sST2对ACOP心肌损伤患者发生院内MACE的预测效能（AUC＝0.876）优于NLR（AUC＝0.754）和入院3 d sST2（AUC＝0.813）。当NLR的最佳临界值为10.02，入院3 d sST2的最佳临界值为43.50 μg/L时，预测中重度ACOP心肌损伤患者发生MACE的敏感度为69.8%和86.2%，特异度为74.3%和70.4%，而二者联合检测的特异度和敏感度为83.4%、79.8%。 结论:NLR和入院3 d sST2是中重度ACOP心肌损伤患者发生院内MACE的独立预测因素，二者联合检测的预测价值好；对于NLR>10.02、入院3 d sST2>43.50 μg/L的中重度ACOP心肌损伤患者需警惕发生院内MACE。

Objective:To investigate the predictive neutrophil/lymphocyte ratio (NLR) combined with soluble growth stimulating expression gene 2 protein (sST2) on in-hospital major adverse cardiovascular events (MACE) in patients with myocardial injury following moderate-severe acute carbon monoxide poisoning (ACOP).Methods:A single-cente prospective observational approach was conducted. Moderate-severe ACOP patients with myocardial damage from November 2016 to February 2020 in department of emergency medicine of Harrison International Peace Hospital Affiliated to Hebei Medical University were enrolled. The baseline data of the patients, NLR and sST2 (T0 sST2) on admission, sST2 at 3 days after admission (T3 d sST2), and the other myocardial injury and biochemical indicators were collected. According to whether MACE occurred, the patients were divided into MACE group and non-MACE group. The clinical data of the two groups were compared. Pearson correlation analysis was used to analyze the correlation of each index. Binary Logistic regression was used to analyze the independent risk factors of in-hospital MACE in patients with moderate-severe ACOP myocardial injury. The receiver operator characteristic curve (ROC curve) was drawn and area under ROC curve (AUC) was calculated to analyze the predictive value of NLR, sST2, and NLR combined with sST2 for the occurrence of in-hospital MACE in patients with moderate-severe ACOP myocardial injury.Results:A total of 278 patients with moderate-severe ACOP myocardial injury were included in the final analysis, and the incidence of MACE was 11.51% (32/278). Cardiac troponin I (cTnI), lactic acid (Lac), NLR, and T3 d sST2 in the MACE group were significantly higher than those in the non-MACE group [cTnI (μg/L): 0.83±0.15 vs. 0.46±0.37, Lac (mmol/L): 2.96±1.14 vs. 2.43±1.35, NLR: 13.14±4.37 vs. 9.49±4.21, T3 d sST2 (μg/L): 59.88±23.42 vs. 39.83±12.60, all P < 0.05], there was no significant difference in T0 sST2 between the MACE group and the non-MACE group (μg/L: 269.09±90.89 vs. 240.14±113.02, P > 0.05). Pearson correlation analysis showed that there were significantly positive correlations in NLR with acute physiology and chronic health evaluationⅡ(APACHEⅡ), T3 d sST2 with APACHEⅡ, and NLR with T3 d sST2 ( r values were 0.226, 0.209, 0.193, all P < 0.01). Binary Logistic regression analysis showed that T3 d sST2 and NLR were both independent risk factors for MACE in moderate-severe ACOP patients with myocardial injury [odds ratio ( OR) and 95% confidence interval (95% CI) respectively was 1.064 (1.039-1.090), 1.176 (1.066-1.298), both P < 0.01]. ROC curve analysis showed that the predictive efficacy of NLR combined with T3 d sST2 for the occurrence of in-hospital MACE in patients with ACOP myocardial injury (AUC = 0.876) was better than that of NLR (AUC = 0.754) and T3 d sST2 (AUC = 0.813). When the optimal critical value of NLR was 10.02 and that of T3 d sST2 was 43.50 μg/L, the sensitivity of predicting the occurrence of MACE in patients with moderate-severe ACOP myocardial injury was 69.8% and 86.2% respectively, and the specificity was 74.3% and 70.4%, respectively. The specificity and sensitivity of the combined detection was 83.4% and 79.8%, respectively. Conclusions:NLR and T3 d sST2 were independent predictors of in-hospital MACE in moderate-severe ACOP patients with myocardial injury, and combined application of NLR and T3 d sST2 had good predictive value. For patients with moderate-severe ACOP myocardial injury with NLR > 10.02 and T3 d sST2 > 43.50 μg/L, the occurrence of in-hospital MACE should be alert.