[Predictive value of neutrophil/lymphocyte ratio combined with soluble growth stimulating expression gene 2 protein on the occurrence of in-hospital major adverse cardiaovascular events in patients with myocardial injury from moderate-severe acute carbon monoxide poisoning: a single-center prospective observational study].

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 evaluation II (APACHE II), T3 d sST2 with APACHE II, 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.