严重创伤患者早期N末端B型利钠肽原的检测

目的 观察严重患者创伤早期N末端B型利钠肽原(NT-proBNP)的水平,探讨其可能的影响因素及应用价值。方法 采用前瞻性观察研究,测定60例收住急诊ICU的严重创伤患者伤后24h的血清NT-proBNP,比较不同预后组的NT-proBNP水平,绘制受试者特征(ROC)曲线分析其对预后判断的价值;分析预后良好组患者NT-proBNP水平与ICU住院时间、机械通气时间的相关性。分析NT-proBNP与损伤严重度评分(ISS)、头部简明创伤评分(AIS)、急性生理和慢性健康评分(APACHE)Ⅱ、格拉斯哥昏迷评分(GcS)、心肌型肌酸激酶同功酶(CK-MB)、肌钙蛋白-Ⅰ (cTn-Ⅰ)、中心静脉压(CVP)等指标的相关性,应用逐步线性回归分析筛选主要的相关因素。结果 预后不良组伤后24h的NT-proBNP中位数水平明显高于预后良好组(762 pg/mL vs.200 pg/mL,Z=-3.972,P＜0.01),其判断预后的价值与ISS、APACHEⅡ等传统指标相似,最佳阈值为384 pg/mL(灵敏度0.846,特异度0.766)。预后良好组患者NT-proBNP水平与ICU住院时间(r =0.32,P＜0.05)、机械通气时间具有正相关性(r=0.37,P＜0.05)。逐步线性回归分析提示APACHEⅡ、CK-MB与NT-proBNP的相关性具有统计学意义。结论 严重创伤后24h的NT-proBNP水平与病情严重度及预后有一定的相关性,可作为严重创伤救治中病情评估的简单参考指标。

Significance of early detection of N-terminal pro-B-type natriuretic peptide in patients with severe trauma

Objective To detect the serum NT-proBNP level in patients with severe trauma 24 hours after injury in order to find the possible correlated factors for the evaluation of the clinical application.Methods Sixty patients with severe trauma admitted to the emergency ICU were enrolled. Serum NTproBNP level was detected 24 hours after injury for comparison between survivors and nonsurvivors. The validity of NT-proBNP for predicting outcome was analyzed by receiver operating characteristic ( ROC )curve. The factors with significant correlation between NT-proBNP level and the length of ICU stay as well as the duration of mechanical ventilation support were determined in those survivors with correlation and stepwise linear regression analysis. These factors included injury severity score (ISS), head abbreviated injury score (AIS), acute physiology and chronic health evaluation Ⅱ ( APACHE I ), Glasgow coma score (GCS), creatine kinase-MB (CK-MB), cardiac troponin-I (cTn-I) and central venous pressure. Results The median NT-proBNP levels were 762 pg/ml (IQR, 400-1131 pg/mL) in nonsurvivors versus 200 pg/ml (IQR, 80-383 pg/mL) in survivors (Z =-3. 972, P ＜0.01 ). The area under ROC curve of NTproBNP was not statistically different to that of ISS and that of APACHE Ⅱ. The best threshold value of NTproBN to predict the outcome was 384 pg/ml ( sensitivity 0. 846, specifity 0. 766). A positive correlation was found between NT-proBNP and the length of ICU stay ( r =0. 32, P ＜ 0. 05 ) as well as the duration of mechanical ventilation ( r =0. 37, P ＜ 0. 05 ) in survivors. Stepwise linear regression analysis indicated there were significant correlations between APACHE Ⅱ, CK-MB and NT-proBNP. Conclusions Serum NT-proBNP level 24 hours after injury is correlated with the severity and outcome of patients with severe trauma. It may be used as a complementary biomarker for the rapid assessment of the severity of trauma.