Objective To discuss the differences of inflammatory parameters such as procalcitonin ( PCT ), C-reactive protein ( CRP ), endotoxin, white blood cell ( WBC ), neutrophil ratio ( Neut%) in blood of septic patients caused by bacterial bloodstream infection, and their correlation with the severity of disease. Methods 292 septic patients with positive blood culture were enrolled in Beijing Shijitan Hospital Affiliated to Capital Medical University from February 2012 to March 2015, and their gender, age, acute physiology and chronic health evaluation Ⅱ( APACHEⅡ) score, bacterial species and other general information were retrospectively collected. The differences in inflammatory parameters ( PCT, CRP, endotoxin, WBC, Neut%) in septic patients caused by bacterial bloodstream infection were compared, their correlations with APACHEⅡ scores within 24 hours were analyzed, and their diagnostic efficacies were also analyzed. Results ①It was shown by Pearson correlation coefficients that positively statistical correlation was found between PCT ( r=0.638 ), CRP ( r=0.620 ), endotoxin ( r=0.284 ), WBC ( r=0.209 ) and APACHEⅡscore ( all P=0.000 ) in bacterial bloodstream infective patients ( n=292 ), and positively statistical correlation was found between PCT ( r=0.626 ), CRP ( r=0.616 ), Neut%( r=0.297 ) and APACHEⅡscore ( all P<0.01 ) in Gram positive bacterial ( G+) group ( n = 86 ), and positively statistical correlation was shown between PCT ( r=0.631 ), CRP ( r=0.616 ), endotoxin ( r=0.301 ), WBC ( r=0.226 ) and APACHEⅡscore ( all P<0.01 ) in Gram negative bacterial ( G-) group ( n=206 ).②It was shown that PCT and CRP of both G+/G-bacterial severe sepsis and septic shock subgroup were significantly higher than those of sepsis subgroup, respectively [ G+ group: PCT (μg/L ):0.92 ( 0.38, 4.75 ) vs. 0.43 ( 0.22, 1.00 ), CRP ( mg/L ):118.45±62.60 vs. 57.97±32.41;G-group:PCT (μg/L ):6.92 ( 1.94, 25.90 ) vs. 1.28 ( 0.27, 4.12 ), CRP ( mg/L ):130.99±60.18 vs. 49.18±26.87, all P<0.01 ], and the endotoxin and WBC in G-bacterial severe sepsis and septic shock subgroup were significantly higher than those of sepsis subgroup [ endotoxin ( ng/L ): 19.40 ( 9.62, 33.87 ) vs. 10.00 ( 5.00, 18.52 ), WBC ( ×109/L ): 12.13±6.72 vs. 9.61±5.01, both P<0.01 ]. The PCT and endotoxin in G-bacterial severe sepsis and septic shock subgroup were significantly higher than those in G+severe sepsis and septic shock subgroup [ PCT (μg/L ):6.92 ( 1.94, 25.90 ) vs. 0.92 ( 0.38, 4.75 ), endotoxin ( ng/L ):19.40 ( 9.62, 33.87 ) vs. 2.56 ( 1.11, 4.01 ), both P<0.01 ].③The diagnostic efficacy of inflammatory parameters for severe sepsis and septic shock subgroup were: PCT area under receiver operating characteristic ( ROC ) curve ( AUC ) = 0.683, the cut-off point = 0.55 μg/L, sensitivity 63.2%, specificity 69.0%; CRP AUC = 0.802, the cut-off point = 92.25 mg/L, sensitivity 73.7%, specificity 86.2%; WBC AUC = 0.614, the cut-off point = 7.35×109/L, sensitivity 75.4%, specificity 48.3%; Neut% AUC = 0.622, the cut-off point = 0.882, sensitivity 43.9%, specificity 79.3%in G+group. At the same time, it was shown that PCT AUC=0.780, the cut-off point=6.80μg/L, sensitivity 51.0%, specificity 93.9%; CRP AUC = 0.907, the cut-off point = 90.10 mg/L, sensitivity 73.2%, specificity 95.9%;endotoxin AUC=0.694, the cut-off point=17.54 ng/L, sensitivity 57.3%, specificity 75.5%;WBC AUC=0.611, the cut-off point = 10.54×109/L, sensitivity 54.1%, specificity 69.4%; Neut% AUC = 0.621, the cut-off point = 0.843, sensitivity 65.6%, specificity 61.2%in G-group. Conclusions The plasma PCT and CRP have the best correlation between inflammatory parameters and severity of disease in bloodstream infective sepsis patients. CRP has the best diagnostic effect in severe sepsis/septic shock patients with bloodstream infection.%目的：探讨血中降钙素原（PCT）、C-反应蛋白（CRP）、内毒素、白细胞计数（WBC）、中性粒细胞比例（Neut%）等炎性指标在细菌性血流感染致脓毒症患者中的差异及与疾病严重程度的相关性。方法回顾性分析2012年2月至2015年3月入住首都医科大学附属北京世纪坛医院重症医学科血培养阳性的292例脓毒症患者的临床资料，收集所有患者性别、年龄、急性生理学与慢性健康状况评分系统Ⅱ（APACHEⅡ）评分、细菌类型等一般资料，比较其24 h内的炎性指标（PCT、CRP、内毒素、WBC、Neut%）水平的差异，分析其与APACHEⅡ评分的相关性，并分析各炎性指标的诊断效应。结果①Pearson相关分析显示，细菌性血流感染患者（n＝292）血中PCT（r＝0.638）、CRP（r＝0.620）、内毒素（r＝0.284）、WBC（r＝0.209）等炎性指标与APACHEⅡ评分均呈显著正相关（均P＝0.000），其中革兰阳性（G+）菌组（n＝86）血中PCT（r＝0.626）、CRP （r＝0.616）、Neut%（r＝0.297）与APACHEⅡ评分呈显著正相关（均P＜0.01），革兰阴性（G-）菌组（n＝206）血中PCT（r＝0.631）、CRP（r＝0.616）、内毒素（r＝0.301）、WBC（r＝0.226）与APACHEⅡ评分呈显著正相关（均P＜0.01）。②G+菌和G-菌两组中严重脓毒症/脓毒性休克患者PCT、CRP水平明显高于脓毒症患者〔G+菌组PCT（μg/L）：0.92（0.38，4.75）比0.43（0.22，1.00），CRP（mg/L）：118.45±62.60比57.97±32.41；G-菌组 PCT（μg/L）：6.92（1.94，25.90）比1.28（0.27，4.12），CRP（mg/L）：130.99±60.18比49.18±26.87，均 P＜0.01〕，而内毒素、WBC在G-菌组中严重脓毒症/脓毒性休克患者水平明显高于脓毒症患者〔内毒素（ng/L）：19.40（9.62，33.87）比10.00（5.00，18.52），WBC（×109/L）：12.13±6.72比9.61±5.01，均P＜0.01〕；且G-菌严重脓毒症/脓毒性休克患者PCT、内毒素水平明显高于G+菌严重脓毒症/脓毒性休克患者〔PCT（μg/L）：6.92（1.94，25.90）比0.92（0.38，4.75），内毒素（ng/L）：19.40（9.62，33.87）比2.56（1.11，4.01），均P＜0.01〕。③各炎性指标对血流感染致严重脓毒症/脓毒性休克患者的诊断效应显示，G+菌组：PCT受试者工作特征曲线（ROC）下面积（AUC）＝0.683，切点值为0.55μg/L时敏感度63.2%、特异度69.0%；CRP AUC＝0.802，切点值为92.25 mg/L时敏感度73.7%、特异度86.2%；WBC AUC＝0.614，切点值为7.35×109/L时敏感度75.4%、特异度48.3%；Neut%AUC＝0.622，切点值为0.882时敏感度43.9%、特异度79.3%。G-菌组：PCT AUC＝0.780，切点值为6.80μg/L时敏感度51.0%、特异度93.9%；CRP AUC＝0.907，切点值为90.10 mg/L时敏感度73.2%、特异度95.9%；内毒素AUC＝0.694，切点值为17.54 ng/L时敏感度57.3%、特异度75.5%；WBC AUC＝0.611，切点值为10.54×109/L时敏感度54.1%、特异度69.4%；Neut%AUC＝0.621，切点值为0.843时敏感度65.6%、特异度61.2%。结论 PCT和CRP在细菌性血流感染患者血炎性指标中与疾病严重程度相关性最佳，而CRP在严重脓毒症/脓毒性休克时对细菌性血流感染的诊断效应最佳。
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