Assay for determination of the serum procalcitonin level: biochemical and clinical evaluation

In patients with inflammatory conditions such as infection, cytokines induce the production of C-reactive protein(CRP) and serum amyloid A protein(SAA) in hepatic cells. It has been reported that upon viral infection, the serum SAA level increases by a greater degree than the serum CRP level. Procalcitonin (PCT), the precursor of calcitonin, is a new type of inflammatory marker that is specifically induced by bacterial infection, sepsis and lethal multiple organ failure, but not by viral infection, autoimmune diseases, tumors or surgical stress. To evaluate the immunoluminometric assay(LUMI test PCT; Brahms Diagnostics, Berlin, Germany) procedure for determining the PCT level and to study the clinical significance of the serum PCT level, we determined the serum levels of PCT, CRP and SAA in patients with various inflammatory diseases and normal subjects. The serum PCT level in the normal subjects was < 0.3 ng/ml. Among the patients with inflammatory disease who had a high CRP level(CRP > 20000 micrograms/dl), the PCT level was elevated only in those patients with severe bacterial infection. These results suggest that determining the PCT level may be useful in the differential diagnosis of severe bacterial infection. The patients who had a low CRP level(CRP < 150 micrograms/dl), had a PCT level within the normal range. The patients with autoimmune disease, viral infection, and fungal infection did not have an elevated PCT level.     

Serum procalcitonin for differentiating bacterial infection from disease flares in patients with autoimmune diseases

Early differentiation between bacterial infections and disease flares in autoimmune disease patients is important due to different treatments. Seventy-nine autoimmune disease patients with symptoms suggestive of infections or disease flares were collected by retrospective chart review. The patients were later classified into two groups, disease flare and infection. C-reactive protein (CRP) and serum procalcitonin (PCT) levels were measured. The CRP and PCT levels were higher in the infection group than the disease flare group (CRP,11.96 mg/dL ± 9.60 vs 6.42 mg/dL ± 7.01, P = 0.003; PCT, 2.44 ng/mL ± 6.55 vs 0.09 ng/mL ± 0.09, P < 0.001). The area under the ROC curve (AUC; 95% confidence interval) for CRP and PCT was 0.70 (0.58-0.82) and 0.84 (0.75-0.93), which showed a significant difference (P < 0.05). The predicted AUC for the CRP and PCT levels combined was 0.83, which was not significantly different compared to the PCT level alone (P = 0.80). The best cut-off value for CRP was 7.18 mg/dL, with a sensitivity of 71.9% and a specificity of 68.1%. The best cut-off value for PCT was 0.09 ng/mL, with a sensitivity of 81.3% and a specificity of 78.7%. The PCT level had better sensitivity and specificity compared to the CRP level in distinguishing between bacterial infections and disease flares in autoimmune disease patients. The CRP level has no additive value when combined with the PCT level when differentiating bacterial infections from disease flares.     

血清降钙素原在儿童发热性疾病中的应用价值分析

目的 探讨降钙素原对儿童发热性疾病早期诊断及鉴别诊断的应用价值。方法 选取2015年7月~2016年3月我院收治的发热患儿270例,其中细菌感染组80例,非细菌感染组130例,对照组（非发热性疾病患儿）60例,入院前1 d已全部行WBC+CRP检测,入院当天全部行PCT检测,对比三组检测结果。结果 细菌感染组外周血WBC+CRP水平高于对照组,差异有统计学意义（P＜0.05）。细菌感染组PCT水平均高于非细菌感染组及对照组,差异均有统计学意义（P＜0.05）。结论 血清PCT可作为早期诊断细菌感染的可靠指标,对儿童发热性疾病的鉴别诊断及抗生素的使用具有重要意义。     

PCT和CRP联合检测对儿童呼吸道感染的临床意义

目的 分析PCT和CRP联合检测对儿童呼吸道感染的临床意义。方法 回顾性分析2016年6月~2017年3月我院呼吸科300例呼吸道感染疾病患儿,根据临床诊断分为病毒感染组（126例）和细菌感染组（174例）,分析两组检测的PCT和CRP结果并计算其阳性率。结果 细菌感染组PCT阳性率为85.63%,CRP阳性率为67.82%;病毒感染组PCT的阳性率为29.37%,CRP阳性率为63.49%。细菌感染组PCT阳性率明显高于病毒感染组;细菌感染组CRP阳性率与病毒感染组无明显差异。结论 PCT在细菌感染阳性率优于CRP,二者联合检测鉴别诊断儿童细菌、病毒感染性疾病具有更高临床价值。     

Neutrophil CD64 Expression in Inflammatory Autoimmune Diseases: Its Value in Distinguishing Infection from Disease Flare

The purpose of this research was to clarify the significance of neutrophil CD64 expression in discrimination between infection and disease flare in patients with inflammatory autoimmune diseases. The study included 63 subjects, 20 healthy controls and 43 patients with inflammatory autoimmune diseases (24 with rheumatoid arthritis & 19 with systemic lupus erythematosus). The FC gamma receptor I (CD64 expression) on neutrophils was measured using flow cytometry. The intensity of CD64 expression on neutrophils was significantly elevated in patients with infections; 49.0 (13–205), and active autoimmune disease; 36.15 (12–133) compared to healthy controls; 5.35 (2.6–14) or patients with inactive disease; 7.5 (3.3–18). In the infectious disease group, expression of CD64 was significantly higher than in the active inflammatory disease group, while there was no significant difference between the group of patients with inactive inflammatory disease and healthy controls (P > 0.05). The sensitivity of CD64 bearing neutrophil intensity for detection of infection (using a cut off value of ≥43.5) was 94.4% and specificity was 88.9%. Neutrophil CD64 expression has a good sensitivity and specificity in differentiating infection from disease flare in patients with inflammatory autoimmune diseases. This assay could facilitate early and accurate diagnosis and greatly aid timely institution of appropriate treatment.     

血清IL-6、IL-10、CRP和PCT水平检测对手足口病早期 合并细菌感染患儿的临床诊断价值

目的 探讨血清IL-6、IL-10、CRP和PCT水平检测对手足口病早期合并细菌感染患儿的临床诊断价值。方法 选取我院收治的早期手足口病患儿90例为观察组,并根据患儿是否合并细菌感染分为单纯组51例和感染组39例,选取同期来我院体检的健康儿童50例为对照组,比较三组间IL-6、IL-10、CRP和PCT水平差异。结果 观察组患儿IL-6、IL-10、CRP以及PCT水平高于对照组,差异有统计学意义（P＜0.05）;感染组患儿CRP以及PCT水平高于单纯组,差异具有统计学意义（P＜0.05）;感染组和单纯组IL-6、IL-10水平比较,差异无统计学意义（P＞0.05）。结论 IL-6、IL-10水平在鉴别手足口病是否合并细菌感染方面的意义有待于进一步研究,而联合CRP和PCT检测可为临床鉴别早期手足口患儿是否合并细菌感染提供可靠的实验室依据,利于临床早期用药治疗。     

血清降钙素原与C反应蛋白在骨伤感染中的应用

目的:评价血清降钙素原(PCT)与C反应蛋白(CRP)对骨伤感染的诊断价值。方法:137例骨伤患者分为细菌感染组(72例)和非细菌感染组(65例),另选取30例健康体检者作为正常对照组。采用一步免疫夹心法和最终荧光检测相结合测定血清PCT水平,采用免疫散射比浊法检测血清CRP水平。比较以上各组及细菌感染组感染控制后(细菌感染控制组)血清PCT、CRP的差异。结果:细菌感染组血清PCT水平明显高于非细菌感染组(P<0.01),但细菌感染组血清CRP水平与非感染组比较无统计学差异(P>0.05)。细菌感染组和非感染组血清PCT和CRP水平均高于正常对照组(P<0.01)。细菌感染控制组血清PCT和CRP水平较细菌感染组显著下降(P<0.01),与正常对照组水平接近。以2ng/ml为PCT诊断细菌感染分界点,其灵敏度、特异度分别为84.50%和88.70%,显著高于CRP(P<0.05)。结论:血清PCT、CRP水平检测对骨伤感染的诊断及疗效监测有重要临床意义。     

WBC、CRP和PCT在急诊发热患者诊治中的应用

目的 探讨WBC、CRP和PCT在急诊发热患者诊治中的应用效果。方法 选用2015年11月~2017年11月中山市人民医院救治的119例急诊发热患者为研究对象,给予患者实施WBC、CRP和PCT检测和病因学检查,依据诊断结果中是否感染细菌分为对照组和观察组,对照组32例为非细菌感染患者,观察组87例为细菌感染患者,对比两组WBC、CRP、PCT诊断情况。结果 观察组的WBC、CRP、PCT水平高于对照组,血液WBC、CRP、PCT的指标中,敏感度、特异度等进行比较,三种联合检测的敏感度和准确度最高。结论 WBC、CRP和PCT在急诊发热患者诊治中的应用效果显著,细菌感染发热患者WBC、CRP和PCT水平明显提升,PCT的特异性更优,CRP敏感度更优,联合检测的应用价值最高。     

PCT、Fb和CRP检测在感染性疾病诊断中的应用

目的：探讨降钙素原（PCT）、纤维蛋白原（n）、C反应蛋白（CRP）检测在早期细菌性感染的诊断价值。方法：采用半定量的胶体金免疫结合法检测血清PCT,磁珠凝固法检测血浆Fb,免疫荧光比色法测定全血CRP水平。分别对细菌感染组91例,非细菌感染组108例,非感染组40例（对照组）进行PCT、Fb和CRP的测定。并同时检测白细胞计数和分类。结果：以血清PCT〉10．5ng／ml、Fb〉4．Og／L、CRP〉8．0mg／L为阳性阈值,细菌感染组PCT的阳性率为98．9％、浓度分别为（O．5～〈2．0）、（2．0～〈10）ng／ml、≥10ng／ml三个级别间;Fb的阳性率为93．4％,浓度为（6．19±1．44）g／L;CRP的阳性率为100％,浓度为（150．5±56．6）mg／L。非细菌感染组PCT的阳性率为18．5％,浓度为（0．5-〈2．0）ng／ml;Fb的阳性率为48．1％,浓度为（4．01±1．18）g／L;CRP的阳性率为47．2％,浓度为（48．9±5．61）mg／L。细菌感染组PCT阳性率明显高于非细菌感染组（P〈0．01）;n、CRP水平明显高于非细菌感染组（P〈0．01,P〈0．01）。非细菌感染组Fb、CRP水平明显高于非感染组（2．58±0．32）g／L（P〈0．01）,Cae（14．5±0．3）mg／L（P〈0．01）。结论：PCT、Fb、CRP联检可作为早期细菌性感染的敏感诊断指标,指导临床合理用药和治疗。     

小儿肺炎中PCT、WBC、hs-CRP检测对疾病诊断及预后判断价值分析

目的 分析小儿肺炎中PCT、WBC、hs-CRP检测对疾病诊断及预后的判断价值.方法 选取2015年5月至2016年4月在本院住院治疗的肺炎患儿120例作为观察组,健康儿童65例作为对照组.检测治疗前后患儿及健康儿童血清PCT、WBC、hs-CRP的变化.结果 治疗前,细菌感染组WBC数量(15.5±3.4)×109/L、hs-CRP水平(19.8±2.6) mg/L和PCT水平(21.9±2.1)ng/mL均明显高于非细菌感染组(6.8 ±2.3)×109/L、(4.5±2.3)mg/L、(4.7±1.8) ng/mL和健康对照组(8.1 ±1.4)×109/L、(3.5±1.2) mg/L、(1.8±0.5) ng/mL,且差异具有统计学意义(P＜0.05).而非细菌感染组和健康对照组的WBC、hs-CRP和PCT结果差异无统计学意义(P＞0.05);治疗后,细菌感染组WBC数量(7.3±1.4)×109/L、hs-CRP水平(5.1 ± 1.2) mg/L和PCT水平(2.3 ± 1.2) ng/mL均明显低于治疗前,差异具有统计学意义(P＜0.05);WBC、hs-CRP、PCT联合检测的灵敏性95.2％、特异性93.0％、准确度93.3％显著高于WBC、hs-CRP、PCT单独检测,差异具有统计学意义(P＜0.05).结论 在小儿肺炎治疗过程中,动态监测患儿血清的WBC、hs-CRP、PCT的变化,并结合临床,有助于诊疗和判断患儿疾病愈后的情况,具有显著的临床意义,值得推广应用.     

血清降钙素原与C-反应蛋白联合检测在肝硬化并肺部感染患者中的诊断价值

目的 探讨血清降钙素原(procalcitonin,PCT)与C-反应蛋白(C-reactive protein,CRP)联合检测在肝硬化并肺部感染患者中的诊断价值及临床意义.方法 选取2014年8月至2016年5月在本院入院治疗的肝硬化并肺部感染患者83例作为研究对象,根据病原学检测结果将其分为肝硬化细菌致肺部感染组(观察组)42例与肝硬化非细菌致感染组(对照组)41例,另选本院同期进行体检健康者40例作为健康组,检测并记录各组PCT、CRP,并采用SPSS21.0软件对所得数据进行处理.结果 治疗前观察组PCT水平均显著高于对照组和健康组,差异具有统计学意义(均P＜0.05);治疗后观察组PCT水平略高于对照组,差异不具有统计学意义(t=1.524,P＞0.05);观察组治疗后PCT水平显著低于治疗前,差异具有统计学意义(t=11.291,P ＜0.05);对照组治疗后PCT水平略高于治疗前,差异不具有统计学意义(t=0.928,P＞0.05).治疗前观察组CRP水平均显著高于对照组和健康组,差异具有统计学意义(P＜0.05);治疗后观察组CRP水平与对照组相比差异不具有统计学意义(t=0.825,P ＞0.05);观察组治疗后CRP水平显著低于治疗前,差异具有统计学意义(t =6.032,P＜0.05);对照组治疗后CRP水平略高于治疗前,差异不具有统计学意义(t=1.853,P＞0.05).观察组患者PCT、CRP单独检测以及PCT、CRP联合检测的阳性检出率均显著高于对照组,差异具有统计学意义(t值依次为8.517、14.624、5.433,均P＜0.05).PCT、CRP联合检测的特异性、灵敏度、阳性预测值与阴性预测值均显著高于PCT、CRP单独检测,差异具有统计学意义(均P ＜0.05).结论 肝硬化患者存在肺部感染风险,通过对肝硬化患者进行血清PCT与CRP联合检测,对肺部感染疾病的早期鉴别诊断具有积极意义.     

降钙素原和白介素-6在感染性疾病病原体诊断中的联合检测价值

目的 探讨降钙素原（PCT）与白介素-6（IL-6）两种血清学标志物在感染性疾病,病原体种类检测中价值.方法 采用上转发光免疫分析仪及配套试剂检测79例细菌感染性疾病患者、59例病毒感染性疾病患者和68例健康体检者血清样本中PCT和IL-6含量,应用受试者工作特征（ROC）曲线进行分析.结果 细菌感染组PCT和IL-6含量高于病毒感染组及正常对照组,差异具有统计学意义（P＜0.05）,病毒感染组PCT和IL-6含量与正常对照组比较差异不具统计学意义（P＞0.05）;应用ROC曲线分析PCT和IL-6鉴别诊断细菌感染的效能,曲线下面积分别为0.854和0.783,显示PCT效能优于IL-6;对三组的PCT与IL-6水平进行了相关性分析,结果显示,PCT与IL-6在检测细菌感染中成线性相关（r=0.424,P＜0.001）;对两项指标进行单项检测时,PCT的灵敏度和特异性分别是82.3％和79.5％,IL-6的灵敏度和特异性分别是69.6％和68.5％;二者联合检测时灵敏度和特异性是88.6％和67.0％.结论 在病原微生物的感染诊断中,PCT是一个优秀指标,若能与IL-6联合检测,更有利于细菌感染性疾病与病毒感染性疾病的鉴别诊断.     

支原体肺炎与细菌性肺炎炎性指标及血清降钙素原水平比较

目的 分析血清炎性细胞因子、血清降钙素原（PCT）、C反应蛋白（CRP）在支原体肺炎与细菌性肺炎中的水平变化及临床意义。方法 回顾分析2018年1月~2019年1月在我院诊治的90例儿童肺炎临床资料,其中诊断为支原体肺炎的51例设为观察A组,细菌性肺炎39例设为观察B组,另选取同期健康儿童40例设为对照组,比较各组血清炎性细胞因子（IL-6、IL-10）、PCT、CRP水平以及观察A组和观察B组急性期与缓解期血清PCT、CRP水平。结果 观察A组、观察B组IL-6水平均高于对照组,IL-10水平低于对照组,差异有统计学意义（P＜0.05）,观察A组与观察B组IL-6、IL-10分别比较,差异无统计学意义（P＞0.05）;观察B组PCT水平高于对照组和观察A组,差异有统计学意义（P＜0.05）,观察A组与对照组比较,差异无统计学意义（P＞0.05）;观察A组、观察B组CRP水平均高于对照组,且观察B组高于观察A组,差异有统计学意义（P＜0.05）;观察A组、观察B组急性期血清PCT、CRP 水平均高于缓解期,差异有统计学意义（P＜0.05）。结论 血清IL-6、IL-10、PCT和CRP有助于儿童支原体肺炎和细菌性肺炎的诊断,支原体肺炎和细菌性肺炎患儿炎性细胞因子水平基本相同,而PCT对细菌性肺炎诊断具有良好指导作用,可作为临床诊治中可靠的参考依据。     

Neutrophil CD64 as a Marker of Bacterial Infection in Acute Exacerbations of Chronic Obstructive Pulmonary Disease

Acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are responsible for most mortality in patients with chronic obstructive pulmonary disease (COPD) and are caused mainly by bacterial infection. We analyzed and compared neutrophil CD64 expression (using the ratio of CD64 level in neutrophils to that in lymphocytes as an index), serum C-reactive protein (CRP), procalcitonin (PCT) levels, white blood cell (WBC) count, and neutrophil percentage among healthy subjects and patients with stable COPD or AECOPD. Compared with patients with COPD and healthy subjects, patients with AECOPD demonstrated significantly increased CD64 index, CRP, PCT, WBC count, and neutrophil percentage. Interestingly, CD64 index and PCT were both significantly higher in patients with AECOPD with positive bacterial sputum culture than those with negative culture. Furthermore, CD64 index and PCT were positively correlated in AECOPD, and there was also correlation between CD64 index and CRP, WBC, and neutrophil percentage. These data suggest that CD64 index is a relevant marker of bacterial infection in AECOPD. We divided patients with AECOPD into CD64-guided group and conventional treatment group. In CD64-guided group, clinicians prescribed antibiotics based on CD64 index; while in the conventional treatment group, clinicians relied on experience and clinical symptoms to determine the necessity for antibiotics. We found that the efficacy of antibiotic treatment in CD64-guided group was significantly improved compared with the conventional treatment group, including reduction of hospital stays and cost and shortened antibiotic treatment duration. Thus, the CD64 index has important diagnostic and therapeutic implications for antibiotic treatment of patients with AECOPD.     

骨感染患者血清CRP、PCT、IL-6水平与病情发展和预后的关系

目的探讨骨感染患者血清C反应蛋白(CRP)、降钙素原(PCT)、白介素-6(IL-6)水平与病情发展和预后的关系。方法病例源于2018年1月至2019年1月本院骨科收治的88例骨感染患者(作为疾病组)和32无骨感染患者(作为对照组),依据疾病组患者的感染程度分为轻度组(n=30)、中度组(n=35)、重度组(n=23),检测各组血清CRP、PCT、IL-6水平,分析血清CRP、PCT、IL-6水平与骨感染患者病情发展、预后的关系。结果不同病情程度骨感染患者血清CRP、PCT、IL-6水平存在明显的差异,且均较对照组明显升高,表现为重度组>中度组>轻度组>对照组(P<0.05);Logistic回归分析提示CRP、PCT、IL-6水平是骨感染严重程度的影响因素(P<0.05);术后半年随访复发率23.86%,复发者血清CRP、PCT、IL-6水平均明显高于未复发者(P<0.05);且Spearman相关性分析显示骨感染患者复发与术前CRP、PCT、IL-6水平均呈明显的正相关(r=0.791、0.928、0.942,均P<0.001)。结论骨感染患者血清CRP、PCT、IL-6水平与其病情严重、预后复发存在明显的正相关,或可通过监测CRP、PCT、IL-6水平以预测患者病情发展和预后。     

中性粒细胞表面CD64在细菌感染诊断与鉴别诊断中的应用价值

在临床工作中,细菌感染早期缺乏特异性临床表现,而细菌培养耗时长、阳性率低,因此早期诊断非常困难.近年来的研究发现,细菌感染早期中性粒细胞表面CD64水平明显升高,全身感染时升高尤为明显,与白细胞计数、中性粒细胞百分数、CRP、ESR、IL-6及降钙素原等炎性指标明显相关,且中性粒细胞表面CD64表达在诊断与鉴别诊断病毒感染、创伤以及自身免疫性疾病活动期方面与其他炎性指标相比更具特异性.因此开展中性粒细胞表面CD64检测有利于细菌感染的早期诊断与鉴别诊断,减少抗生素的滥用和耐药的发生,具有广泛的临床应用前景.     

Procalcitonin, a new marker for bacterial infections

Procalcitonin (PCT), the precursor protein of the hormone calcitonin, appears to be an early marker of the presence of severe systemic infection. High serum concentrations are associated with severe systemic bacterial, parasitic or fungal infections. In contrast, PCT is generally not induced by severe viral infections or inflammatory reactions of non-infectious origin. Hence, PCT can be used for differential diagnosis of bacterial and viral meningitis. PCT may be helpful in the differentiation between infectious and non-infectious origin of systemic inflammatory response syndrome (SIRS) and acute respiratory distress syndrome (ARDS), pancreatitis, cardiogenic shock and acute rejection of organ transplants. PCT monitoring may be useful in patients with high risk of bacterial infection (major surgery, trauma, immunocompromised patients). PCT is a very stable molecule in vitro, and its measurement requires only 20 ml of plasma or serum and can be done within 2 hours.     

自身抗体与血浆炎症因子联合检测对肝硬化合并肝功能衰竭的诊断价值

目的 探讨和分析自身抗体、血浆炎症指标联合检测在肝硬化合并肝功能衰竭患者中的诊断价值.方法 选取2014年10月至2016年8月我院收治的62例肝硬化合并肝功能衰竭患者作为试验组,并选取同一时段于我院治疗的42例慢性肝炎患者作为疾病对照组,以及42例健康体检志愿者作为健康对照组.分别采用电化学发光法(ECLIA)检测3组的血清PCT水平,采用免疫散射比浊法(INA)检测血清CRP水平,以及酶联免疫标记法(ELISA)检测其血清AMA-M2和抗-gp210水平.结果 试验组血清PCT、CRP表达水平与疾病对照组和健康对照组相比,差异具有统计学意义(P<0.05);而对疾病对照组和健康对照组的血清PCT、CRP表达水平比较发现,同样呈现显著性差异(P<0.05);试验组血清AMA-M2、抗-gp210、PCT及CRP检测的阳性率均明显高于两对照组,差异有统计学意义(P<0.05);血清AMA-M2、抗-gp210、PCT及CRP检测的灵敏度分别为82.3%、71.0%、74.1%和58.1%,特异性分别为91.7%、80.9%、76.2%和67.9%,准确度分别为76.7%、79.5%、78.8%和72.6%,而四者联合检测的灵敏度、特异度及准确度分别为43.5%、96.9%和92.7%,与各指标单独检测相比,灵敏度下降、特异度和准确度提升,差异有统计学意义(P<0.05).此外AMA、抗-gp210和PCT或CRP三者联合检测同样会显著降低灵敏度,提升特异性,但准确度变化不大.结论 AMA-M2、抗-gp210、PCT及CRP单独检测在肝硬化合并肝功能衰竭的诊断中具有一定的价值,但也存在着误诊及漏诊的情况,而自身抗体与血浆炎症指标的联合检测可有效提高检测特异度及准确度,增加疾病的检测率,值得临床推广运用.     

PCT和IL-6在感染性疾病中的诊断价值

目的：探讨血清降钙素原（PCT）与白介素-6（IL-6）在感染性疾病中的诊断价值。方法：采用罗氏全自动电化学发光免疫分析仪检测90例细菌感染性疾病、80例病毒感染性疾病和80例健康体检正常人血清PCT、IL-6含量,并对其结果进行分析。结果：细菌感染组PCT和IL-6含量显著高于病毒组及正常对照组,有显著性差异（P〈0.05）,病毒感染组PCT和IL-6含量与正常对照组比较无显著性差异（P〉0.05）,细菌感染组PCT和IL-6含量之间存在正相关性（P〈0.05）,病毒感染组PCT与IL-6含量之间无相关性（P〉0 05）,细菌感染组PCT、IL-6的阳性率显著高于病毒感染组及正常对照组,有显著性差异（P〈0.05）,病毒感染组PCT、IL-6阳性率与正常对照组相比无显著性差异（P〉0.05）,细菌感染组PCT的阳性率明显高于IL-6,有显著性差异（P〈0.05）。结论：IL-6在细菌感染中会出现阳性,但其不如PCT敏感,PCT检测是鉴别诊断细菌、病毒感染性疾病的良好指标。     

降钙素原、乳酸及C反应蛋白在重症肺炎中的变化及意义

目的 分析不同时间重症肺炎（SP）患者降钙素原（PCT）、乳酸（Lac）和C-反应蛋白（CRP）水平的变化及其意义。方法 选择2016年1月~2018年12月我院收治的67例SP患者,分别在患者入院后的第1、3、7天以及好转出科或死亡前检测PCT、Lac及CRP水平,同时行APACHE-Ⅱ评分。根据患者预后情况分为存活组（48例）和死亡组（19例）。比较两组不同时间血清PCT、Lac、CRP水平及其与APACHE-Ⅱ评分的相关性。结果 存活组第3、7天以及好转出科前PCT、Lac、CRP、APACHE-Ⅱ评分均低于第1天（P＜0.05）;死亡组第3、7天以及死亡前PCT、Lac、CRP、APACHE-Ⅱ评分均高于第1天（P＜0.05）;死亡组不同时间PCT、Lac、CRP、APACHE-Ⅱ评分均高于存活组（P＜0.05）。重症肺炎患者血清PCT、Lac、CRP与APACHE-Ⅱ评分呈正相关（r＝0.721、0.613、0.814,P＜0.05）。结论 PCT、Lac、CRP与SP的病情程度有关,病情越严重,血清水平越高;动态监测PCT、Lac、CRP及APACHE-Ⅱ评分有助于病情和预后的判断。