Value of combined detection of serum amyloid A,C-reactive protein and procalcitonin in differential diagnosis of respiratory tract infection in children of China

ObjectiveTo explore the diagnostic value of combined detection of serum amyloid A (SAA), C-reactive protein (CRP) and procalcitonin (PCT) in children with bacteria or non-bacterial respiratory tract infection.Methods200 children with respiratory tract infections diagnosed in our hospital were included in the study. According to the results of the aetiological examination, they were divided into bacterial infection group and non-bacterial infection group. At the same time, 100 healthy children admitted to the hospital for physical examination during the same period were selected as the healthy subjects control group. Changes in serum SAA, PCT and CRP in three groups were compared. Comparison of a positive rate of the single index and combined detection were performed. Children with bacterial infections were treated with conventional antibiotics. The changes in serum SAA, PCT and CRP in the infection group before and after treatment were compared. The efficacy of SAA, PCT and CRP alone and in combination was compared.ResultsThe serum SAA, PCT and CRP levels in the bacterial infection group were higher than those in the non-bacterial infection group and healthy children, and the differences were statistically significant. The positive detection rates and combined detection rates of serum SAA, PCT and CRP in the bacterial infection group were higher than those in the non-bacterial infection group and the healthy subject''s control group. After conventional antibiotic treatment, serum SAA, PCT and CR levels in children with bacterial infection were significantly decreased.ConclusionThe combined detection based on SAA, CRP and PCT can effectively identify and diagnose respiratory tract infection in children, providing a certain reference for the promotion of the diagnostic scheme.

Key messages

• Serum SAA, PCT and CRP were highly expressed in children with respiratory tract infection, and the expression level was the highest in children with bacterial pneumonia.
• The combined detection of serum SAA, CRP and PCT indicators have higher diagnostic efficiency and can effectively make a differential diagnosis of respiratory tract infection in children.

     

支原体肺炎患儿血清IL-6、SAA、hs-CRP、PCT联合检测的临床意义

目的:探讨血清IL-6、SAA、hs-CRP、PCT联合检测在儿童肺炎支原体感染及其合并细菌、病毒感染中的鉴别诊断价值.方法:收集2017年8月～2019年12月在淄博市第一医院儿科收治的支原体肺炎患儿349例,感染组分为单纯MPP组161例、合并病毒感染组64例、合并细菌感染组94例,随机选取同期淄博市第一医院健康体...     

肝素结合蛋白在感染性肺炎诊断中的价值分析

目的:探讨肝素结合蛋白(HBP)水平在感染性肺炎诊断中的临床应用价值。方法:选取2017年3月至12月在辽宁省人民医院收治的细菌性肺炎患者51例,非细菌性肺炎患者44例,选取同时期体检健康者51名作为健康人对照组。分别测定各组患者血液中HBP、血清淀粉样蛋白A(SAA)、降钙素原(PCT)及WBC水平,统计分析各指标组间差异;ROC曲线分析各指标对感染性肺炎的诊断效能。结果:血浆HBP水平在细菌性肺炎组[52.00(25.00,101.00)ng/mL]显著高于非细菌肺炎组[(12.14±6.46)ng/mL]和健康人对照组[(11.86±5.14)ng/mL],差异有统计学意义(P<0.05);血浆HBP水平在非细菌性肺炎组和健康人对照组中差异无统计学意义(P>0.05)。细菌性肺炎组[80.89(46.46,167.35)mg/L]、非细菌肺炎组[11.86(2.06,52.56)mg/L]及健康人对照组[(3.34±2.98)mg/L]各组间SAA水平比较,差异均有统计学意义(P<0.01);ROC曲线分析,HBP与SAA诊断细菌性肺炎的曲线下面积(AUC)分别是0.917和0.834,当HBP诊断阈值为19.5 ng/mL时,诊断细菌性肺炎的敏感性和特异性分别为80.4%和88.4%;SAA诊断阈值为18.84 mg/L时,诊断细菌性肺炎的敏感性为78.4%,特异性为81.1%;联合HBP与SAA诊断细菌性肺炎的敏感性和特异性分别为90.2%和80.0%。HBP与SAA在鉴别诊断细菌性肺炎与非细菌性肺炎的AUC分别为0.908和0.748,当HBP=20.50 ng/mL和SAA=16.31 mg/L时,特异性分别为88.6%和54.5%。结论:血浆HBP是较敏感的细菌性感染标志物,在鉴别细菌与非细菌性肺炎中的诊断价值优于血清SAA、PCT及WBC,与血清SAA联合检测可提高诊断细菌性肺炎的敏感性。     

The utility of biomarkers in differentiating bacterial from non-bacterial lower respiratory tract infection in hospitalized children: Difference of the diagnostic performance between acute pneumonia and bronchitis

The aim of this study is to investigate the utility of several biomarkers in differentiating bacterial community-acquired lower respiratory tract infection (CA-LRTI) from non-bacterial CA-LRTI in children and the difference of their diagnostic performance between pneumonia and bronchitis. A retrospective cohort study composed of 108 pediatric patients hospitalized for CA-LRTI was performed during 2010–2013. Based on the findings of chest X-ray and sputum samples, patients were divided into 4 categories, group of bacterial pneumonia or bronchitis, and non-bacterial (viral or etiology-unknown) pneumonia or bronchitis. Peripheral white blood cell and neutrophil counts, and serum C-reactive protein (CRP) and procalcitonin (PCT) levels were compared among the 4 groups. Finally, 54 patients were the subject of this study. In the patients with pneumonia, serum CRP and PCT levels were significantly elevated in the group of bacterial pneumonia (CRP: p = 0.02, PCT: p = 0.0008). The area under the receiver operating characteristic curve for PCT for distinguishing between bacterial and non-bacterial pneumonia was the largest, and sensitivity, specificity, positive predictive value and negative predictive value of PCT were best among 4 markers. On the other hand, in the patients with bronchitis, neutrophil count was significantly decreased in non-bacterial bronchitis whereas no significant differences of WBC count, CRP level or PCT level were seen. In conclusion, PCT was the most useful marker to differentiate bacterial pneumonia whereas neutrophil count contributed most to the discrimination of bacterial bronchitis. The diagnostic performance of biomarkers may be different between pneumonia and bronchitis.     

降钙素原、C反应蛋白在社区获得性肺炎细菌感染的诊断价值

目的：探讨血清降钙素原（PCT）及C反应蛋白（CRP）在社区获得性肺炎（CAP）中的诊断价值。方法回顾性分析明确诊断为肺部疾病的患者122例,分为细菌感染组54例和非细菌感染组68例,并根据重症肺炎诊断标准,将细菌感染组分为重症肺炎18例,轻中症肺炎36例。记录并比较所有患者入院24 h内的血常规、PCT、CRP、病原学等指标,并描绘ROC曲线进行分析。结果 PCT及CRP在CAP患者中的水平高于非细菌感染的患者（t分别=3.62、7.25,P＜0.05）。重症组的PCT和CRP水平明显高于轻中症组（t分别=2.37、2.65,P均＜0.05）。 ROC曲线分析显示,所有患者PCT和CRP的ROC曲线下面积分别为0.89和0.88,PCT和CRP诊断CAP细菌感染的最佳诊断阈值分别为0.09μg/L、29.27 mg/L。重症细菌感染组PCT和CRP的ROC曲线下面积分别为0.80和0.74,PCT和CRP诊断重症细菌感染的最佳诊断阈值分别为0.17μg/L、85.17 mg/L,此时PCT、CRP的灵敏度分别为88.89%、66.67%,特异度分别为66.65%、80.55%,PCT对重症细菌感染具有高度灵敏度,在重症细菌感染中的敏感性较CRP高,特异性未见明显优势。结论CAP患者的PCT及CRP水平较非细菌感染肺疾病患者高;PCT联合CRP对诊断细菌性肺炎及重症细菌感染性肺炎具有更高的特异性,有助于提高诊断的准确性。     

降钙素原在肾移植术后患者肺部感染诊断中的应用

目的 研究血清降钙素原(PCT)在肾移植术后并发肺部感染患者诊断中的实用价值.方法 回顾性研究肾移植术后并发肺部感染患者102例,根据肺部感染的病原体诊断标准分为细菌组(32例)和非细菌组(70例),检测并比较两组PCT和C-反应蛋白(CRP)值,将两组数据进行统计学比较.结果 肾移植术后并发肺部细菌感染患者血清中PCT增高较非细菌组差异具有统计学意义(P<0.01).CRP增高较非细菌组差异无统计学意义(P>0.05).比较32例肾移植术后并发肺部细菌感染患者血清中PCT增高例数和CRP增高例数差异无统计学意义,不存在一致性.结论 PCT对肾移植术后是否并发肺部细菌感染患者具有明显的临床诊断价值.

Abstract：

Objective To evaluate the practical value of procaleitonin(PCT)in diagnosis of pneumonia in patients after kidney transplantation.Method A total of 102 patients with pneumonia after kidney transplantation were reviewed.According to the diagnostic criteria of pathogens of pneumonia,32 patients were enrolled in bacterial group and 70 patients in non-bacterial group.The data of the PCT level and the C-reactive protein (CRP) level of the two groups were determined and compared with each other.Results There was significant difference in PCT level between bacterial pneumonia patients after kidney transplantation and non-bacterial pneumonia patients group (P<0.01).The difference in CRP level between bacterial pneumonia patients after kidney transplantation and non-bacterial pneumonia patients group was not significant (P>0.05).The changes of PCT level and the CRP level in 32 patients with bacterial pneumonia after kidney transplantation were not significant (P>0.05),and they were not associated with each other.Conclusions Monitoring the PCT level in patients with bacterial pneumonia after kidney transplantation would have an obviously clinical significance in diagnostic value.     

血清淀粉样蛋白A对肺炎支原体肺炎患儿的诊断价值

目的 分析血清淀粉样蛋白A(SAA)对肺炎支原体肺炎(MPP)患儿的诊断价值.方法 选取2020年1月至2020年10月我院收治的70例MPP患儿纳入观察组,选取同期于我院体检的70名健康儿童纳入对照组.所有研究对象均检测SAA、C-反应蛋白(CRP)、血清降钙素原(PCT)水平和白细胞计数(WBC).比较两组研究对象...     

感染性肺炎患儿FIB、PCT、hs-CRP水平的变化及意义

目的观察小儿感染性肺炎患者血浆纤维蛋白原(FIB)、血清降钙素原(PCT)、超敏C反应蛋白(hs-CRP)水平变化及意义。方法将细菌感染性肺炎(细菌组)104例、非细菌感染(非细菌组)109例和健康体检儿童110例(对照组)纳入本研究,观察各组FIB、PCT、hs-CRP水平变化。结果细菌组患者FIB、PCT、hs-CRP均高于非细菌组和对照组(P0.05)。病毒组、支原体组和衣原体组患儿FIB、PCT、hs-CRP水平比较,差异无统计学意义(P0.05)。非细菌组、细菌组联合检测阳性率明显高于单项指标检测阳性率(P0.05)。细菌组中患儿FIB水平与PCT、hs-CRP均呈正相关(r分别为0.445、0.396,P0.05)。PCT与hs-CRP呈正相关(r=0.487,P=0.021)。结论 FIB、PCT、hs-CRP联合检测能有效鉴别细菌感染和非细菌感染,对肺炎的病原体感染的诊断和疗效评价具有重要临床意义。     

Is procalcitonin better than C‐reactive protein for early diagnosis of bacterial pneumonia in children?

Early diagnosis of bacterial pneumonia plays a pivotal role in the management. We evaluated the diagnostic accuracy of procalcitonin (PCT) as compared with C‐reactive protein (CRP) for the early diagnosis of bacterial pneumonia in children. In total, 92 children consisting of 46 patients of bacterial pneumonia were admitted in the Military hospital, Rawalpindi, Pakistan and equal number of controls were included. Patient's investigations were carried out at admission. PCT and CRP were analyzed on Vidas analyzer and Immulite 1000, respectively. Out of 46 pneumonia patients, 28 were male and 18 female, with a median age of 4 years. PCT levels were significantly high median (range) of 2.69 ng/ml (0.30–13.00) vs. 0.45 ng/ml (0.10–2.00) in controls. Serum CRP levels were moderately elevated with median (range) 6.5 mg/l (0.30–60) vs. 0.30 mg/l (0.30–5.0) in controls. The area under receiver characteristic curves for PCT and CRP were 0.89 (95% CI=0.83–0.96) and 0.79 (95% CI=0.70–0.88), respectively. In total, 38 patients were diagnosed to have bacterial pneumonia with PCT (sensitivity 83% at cutoff ≥1 ng/ml) and 26 children with CRP (sensitivity 57% at cutoff ≥6 mg/L). PCT has better diagnostic accuracy than CRP and can be utilized for early diagnosis of bacterial pneumonia in children. J. Clin. Lab. Anal. 24:1–5, 2010. © 2010 Wiley‐Liss, Inc.     

几种感染指标在儿童细菌性脓毒症的诊断价值

目的 分析白细胞计数(WBC)、中性粒细胞/淋巴细胞比率(NLCR)、C-反应蛋白(CRP)、降钙素原(PCT)等指标在儿童细菌性脓毒症早期诊断的临床价值。方法 选取53例诊断为细菌性脓毒症住院患者作为研究组,另选取50例同期门诊体检健康儿童作为对照组,分别检测WBC、NLCR、CRP、PCT水平并比较差异;同时采用受试者工作特征(ROC)曲线评价各项指标诊断儿童细菌性脓毒症的准确性。结果 53例儿童细菌性脓毒症患者血培养均阳性,以革兰阳性球菌为主(60.4%)。革兰阳性球菌感染组、革兰阴性杆菌感染组WBC、NLCR、CRP、PCT水平均显著高于对照组,差异均有统计学意义(均P<0.05);经ROC曲线分析提示CRP及联合应用WBC与NLCR对于诊断细菌性脓毒症有较高的准确性,AUC为0.90(0.84~0.97)、0.91(0.84~0.97);联合应用WBC、NLCR、CRP与PCT 4种指标有更高的准确性,AUC为0.97(0.94~1.00);而WBC、NLCR、PCT有一定的准确性,AUC分别为0.85(0.77~0.93)、0.89(0.82~0.96)、0.88(0.80~0.96)。结论WBC、NLCR、CRP、PCT等4种感染诊断指标对于早期诊断儿童细菌性脓毒症均有价值,联合应用4种指标有更高的准确性。     

儿童肺炎支原体肺炎感染指标的诊断价值

目的探讨WBC、C反应蛋白（CRP）、血清淀粉样蛋白A（SAA）、降钙素原（PCT）在儿童肺炎支原体肺炎（MPP）诊治中的价值。 方法回顾性分析本院儿科确诊的154例住院患儿（MPP组）,以临床症状结合影像学的诊断结果作为诊断标准,并选择同期非肺部感染患儿51例,作为对照组。对2组间WBC、CRP、SAA、PCT 4项炎性标志物的检测结果进行分析。 结果MPP组中WBC、CRP、SAA、PCT检测结果均显著高于对照组,差异有统计学意义（P均<0.05）。单项检测时,PCT诊断敏感度最高［85.71%（132/154）］,CRP和SAA特异度高［96.08%（49/51）、96.08%（49/51）］;2项联合检测时,WBC＋PCT诊断敏感度最高［94.81%（146/154）］,WBC＋SAA和CRP＋SAA诊断特异度最高［均为96.08%（49/51）］;3项联合检测时,WBC＋CRP＋PCT和WBC＋PCT＋SAA诊断敏感度最高［均为96.10%（148/154）］,WBC＋CRP＋SAA诊断特异度最高［92.16%（47/51）］;CRP＋SAA＋PCT＋WBC联合检测的诊断敏感度最高［98.70%（152/154）］,但特异度较低［60.78%（31/51）］。 结论儿童MPP时,在检测肺炎支原体抗体的同时,通过联合检测WBC、CRP、SAA、PCT 4项炎症标志物可有效提高临床的诊断效能。     

血清降钙素原和C反应蛋白水平改变在支原体肺炎患儿中的临床意义

目的探讨血清降钙素原和C反应蛋白水平改变在支原体肺炎患儿中的临床意义。方法选择支原体肺炎、细菌性肺炎患儿各67例为支原体肺炎组和细菌性肺炎组,选择健康体检儿童67例为健康对照组。检测各组血清降钙素原(PCT)和C反应蛋白(CRP)水平并分析。结果支原体肺炎组急性期血清PCT水平显著高于健康对照组,但显著低于细菌性肺炎组(P均0.05)。支原体肺炎组、细菌性肺炎组血清CRP水平显著高于健康对照组(P0.05),但两者CRP水平比较无显著差异。治疗后发现恢复期支原体肺炎组血清PCT、CRP水平显著下降,与健康对照组无统计学差异(P均0.05)。结论早期联合检测呼吸道感染患儿PCT与CRP水平可帮助早期鉴别支原体感染肺炎和细菌性感染肺炎,并可作为疗效观察的参考依据。     

降钙素原在儿童呼吸道细菌性感染诊断中的应用

目的研究血清降钙素原（PCT）在儿童呼吸道细菌性感染诊断中的实用价值。方法回顾性研究儿童呼吸道细菌性感染患者86例,根据儿童呼吸道感染的病原体诊断标准分为细菌性感染组（54例）和非细菌性感染组（32例）,检测并比较两组PCT和C反应蛋白（CRP）值,将两组数据进行统计学分析。结果细菌性感染组患者血清中PCT水平为（1.04±0.47）μg/L,高于非细菌性感染组的（0.20±0.08）μg/L,差异有统计学意义（P〈0.05）,CRP水平与非细菌性感染组比较差异无统计学意义（P〉0.05）。54例细菌性感染组患者血清中,PCT增高48例,CRP增高35例,差异有统计学意义（P〈0.05）,PCT和CRP诊断细菌性儿童呼吸道感染不存在一致性。结论 PCT对儿童呼吸道是否细菌感染具有明显的临床诊断价值。     

Comparison of procalcitonin with C-reactive protein and serum amyloid for the early diagnosis of bacterial sepsis in critically ill neonates and children

OBJECTIVES: To evaluate procalcitonin (PCT) as a diagnostic marker of bacterial sepsis in critically ill neonates and children and to compare the results of PCT with those of C-reactive protein (CRP) and serum amyloid (SAA). DESIGN AND SETTING: Prospective, observational study in neonatal and pediatric intensive care units. PATIENTS: A total of 116 divided into four groups according to age and diagnosis: neonates (aged 3-30 days) with sepsis (n = 20), neonates without sepsis (n = 26), children (aged 2-12 years) with sepsis (n = 32), and children without sepsis (n = 38). INTERVENTIONS: Serum PCT, CRP, and SAA were measured on admission or when a bacterial sepsis was suspected. Area under the receiver operating characteristic (ROC) curve, optimum predictive values, and optimum diagnostic cut off values were evaluated. RESULTS: Admission PCT was significantly higher in neonates and children with sepsis than in the other groups. In the neonates the area under the ROC curve was 0.99 for PCT, 0.95 for CRP, and 0.98 for SAA; in the children it was 1 for PCT, 0.93 for CRP, and 0.96 for SAA. Cutoff concentrations for optimum prediction of sepsis in the neonates were PCT > 6.1 ng/ml (diagnostic efficiency: 93.8%), CRP > 23.0 mg/l (89.7%), and SAA > 41.3 mg/l (95.3%); in the children they were PCT > 8.1 ng/ml (100%), CRP > 22.1 mg/l (89.8%), and SAA > 67.2 mg/l (94.4%). CONCLUSION: In critically ill children PCT concentration is a better diagnostic marker of sepsis than CRP and SAA. In critically ill neonates, however, PCT, CRP, and SAA are similar diagnostic markers of sepsis. A PCT concentration higher than 8.1 ng/ml identified all children with bacterial sepsis.     

降钙素原C-反应蛋白及病原体检测对下呼吸道感染的诊断价值

目的探讨降钙素原(PCT)、C-反应蛋白(CRP)及呼吸道感染病原体抗体联合细菌培养在下呼吸道感染诊断中的诊断价值。方法将119例下呼吸道感染者分为细菌感染组(75例)与非细菌病原体感染组(44例),同期健康体检者60例为健康对照组。采用酶联荧光分析及速率散射比浊法测定PCT及CRP,采用荧光免疫分析检测呼吸道感染病原体抗体,同时对患者的痰及血液进行培养。结果细菌感染组的PCT及CRP水平均高于非细菌病原体感染组及健康对照组(P<0.01)。以PCT>0.5ng/mL、CRP>8.0mg/L为阈值,PCT及CRP的敏感性分别为89.3%和84.0%(二者比较,P>0.05)与非细菌病原体感染组及健康对照组比较差异有统计学意义(P<0.01),PCT对细菌感染诊断的特异度为88.4%高于CRP的78.8%(P<0.05);痰培养和血培养联合检测可提高细菌的阳性检出率(41.3%);下呼吸道细菌感染诊断实验的敏感度依次为:PCT与CRP大于细菌培养。呼吸道感染病原体抗体对于非细菌病原体感染组的阳性检出率为56.8%。结论 PCT及CRP适宜细菌感染的早期诊断,PCT的特异度高于CRP;同时联合呼吸道感染病原体抗体检查及细菌培养对于下呼吸道感染的诊断与鉴别诊断具有重要的价值。     

降钙素原与淀粉样蛋白A检测在学龄前儿童早期细菌感染中的诊断价值

目的探讨血清降钙素原(PCT)与淀粉样蛋白A(SAA)检测在学龄前儿童细菌感染性疾病早期诊断及疗效评价中的应用价值,以提高临床对早期细菌感染的诊断水平。方法选取2015年1~12月北京大学深圳医院儿科感染性疾病患儿120例,分为细菌感染组(60例)和病毒感染组(60例),同时选取50例健康体检儿童作为健康对照组。将各组研究对象的血清PCT、SAA水平进行观察和比较,采用SPSS19.0软件进行统计分析。结果细菌感染组与病毒感染组、健康对照组比较PCT和SAA水平明显升高(P0.05),经有效抗菌药物治疗后PCT和SAA水平均明显降低(P0.05);细菌感染组PCT和SAA的阳性率分别为91.7%和95.0%,明显高于病毒感染组和健康对照组(P0.05),PCT诊断细菌感染的敏感度低于SAA,但特异度、阳性预测值、阴性预测值均高于SAA,相关性分析显示,细菌感染组PCT和SAA水平呈正相关(r=0.782,P0.01)。结论 PCT和SAA检测有助于学龄前儿童细菌感染的早期诊断、判断病情,并指导合理用药,其中PCT诊断细菌感染的效率要优于SAA。     

血清SAA、CRP、PCT及TAP联合检测在急性重症胰腺炎早期诊治中的临床意义

目的分析急性胰腺炎患者血清中淀粉样蛋白A(SAA)、C反应蛋白(CRP)、血清降钙素原(PCT)及胰蛋白酶原激活肽(TAP)水平的变化,评价以上4项指标联合检测在急性胰腺炎诊治中的临床价值。方法 70例急性胰腺炎患者中重症急性胰腺炎组(SAP组)21例,轻症急性胰腺炎组(MAP组)49例,分别检测急性期患者体内PCT、SAA、CRP及TAP水平,并与50例健康对照进行比较。结果 SAP组与MAP组急性发作期患者血清PCT、SAA、CRP及尿TAP水平均与健康对照组不同,差异有统计学意义(P0.01);SAP组血清PCT、SAA、CRP及TAP水平均明显高于MAP组,差异有统计学意义(P0.01),4项指标联合检测效能高于单项指标检测。结论联合检测患者血清中SAA、CRP、PCT及TAP水平的变化,有助于急性胰腺炎的早期诊断及病情判断,对SAP的诊治具有重要意义。     

成人社区获得性肺炎患者血清颗粒蛋白前体和淀粉样蛋白A检测的临床意义

目的探讨成人社区获得性肺炎(CAP)患者血清颗粒蛋白前体(PGRN)和血清淀粉样蛋白A(SAA)水平,阐明其在CAP诊治中的价值。方法选择上海市浦东医院2018年1月-2019年4月CAP患者120例作为CAP组,同期健康体检成人120名作为对照组。测定血清PGRN、SAA、C反应蛋白(CRP)、降钙素原(PCT)水平。结果 CAP组血清PGRN、SAA、CRP、PCT水平均高于对照组(P<0.05)。CAP重症组血清PGRN、SAA、CRP、PCT水平均高于非重症组(P<0.05)。CAP死亡组血清PGRN、SAA、CRP、PCT水平均高于好转组(P<0.05)。CAP患者血清PGRN、SAA水平与CRP、PCT水平变化均呈正相关(P<0.05)。血清PGRN、SAA、CRP、PCT水平及其联合诊断CAP的受试者工作特征(ROC)曲线的曲线下面积分别为0.832、0.827、0.721、0.750、0.902;灵敏度分别为73.2%、69.6%、75.1%、63.6%、84.7%;特异度分别为76.5%、74.2%、68.4%、77.5%、94.4%。血清PGRN、SAA水平诊断重症CAP的ROC曲线的曲线下面积分别为0.735、0.718;诊断死亡CAP的ROC曲线的曲线下面积分别为0.776、0.785。结论成人CAP患者血清PGRN、SAA水平升高,可反映机体炎症程度及病情严重程度和预后,两者联合CRP和PCT可提高CAP的诊断价值。     

感染性疾病实验室诊断方法的Logistic回归分析

目的建立Logistic回归模型,探讨检测C反应蛋白(CRP)、血清淀粉样蛋白A(SAA)及降钙素原(PCT)在感染性疾病鉴别中的诊断价值。方法选取230例病毒感染者、245例细菌感染者和200例健康对照者,采用单因素及多因素分析方法对实验室检测结果进行比较分析,建立感染性疾病诊断方法的Logistic回归模型并绘制ROC曲线。结果感染组与对照组的CRP、SAA、PCT、白细胞计数(WBC)及SAA/CRP差异均有统计学意义(P0.05)。细菌感染组CRP、SAA、PCT、WBC及中性粒细胞百分比(NEU%)水平明显高于病毒感染组和对照组,而病毒感染组血清淋巴细胞百分比(LY%)及SAA/CRP又明显高于细菌感染组(P0.01)。细菌感染组筛选了4项指标进入Logistic回归模型:CRP、SAA、PCT及WBC,其中CRP、SAA和PCT的ROC曲线下面积均超过了0.900;病毒感染组仅SAA与WBC进入Logistic回归模型,其中SAA的ROC曲线下面积为0.859。结论以实验诊断技术建立的Logistic回归模型有利于临床早期鉴别诊断感染性疾病,尤以联合检测SAA和CRP或PCT更有意义。     

小儿肺炎不同感染病原体类型外周血WBC和血清CRP、PCT水平特点及其相关性研究

目的探讨小儿肺炎不同感染病原体类型患儿外周血白细胞计数(WBC)及血清C反应蛋白(CRP)、降钙素原(PCT)水平特点及其与小儿肺炎严重程度的相关性。方法回顾性选取2017年4月至2019年2月朝阳市第二医院收治的158例肺炎患儿,其中细菌性肺炎(BP) 53例,支原体肺炎(MP) 64例,病毒性肺炎(VP) 41例;并根据小儿肺炎严重程度分为重症肺炎21例和轻症肺炎137例。同时选择同期30例健康体检儿童作为健康对照组(HC组)。所有受试对象均进行外周血WBC和血清CRP、PCT水平检测。结果 BP组外周血WBC及血清CRP、PCT水平均显著高于MP组、VP组和HC组,差异有统计学意义(P <0.05);MP组与VP组血清CRP、PCT浓度均显著高于HC组,MP组血清CRP含量显著高于VP组,差异有统计学意义(P <0.05)。除VP组、HC组的血清CRP阳性率比较差异无统计学意义外,其他各组肺炎患儿与HC组的外周血WBC和血清CRP、PCT的阳性率差异与其血中水平差异一致。BP组血清PCT、CRP阳性率均显著高于外周血WBC阳性率,差异有统计学意义(P <0.05)。MP组血清PCT阳性率均显著高于血清CRP和外周血WBC的阳性率,而血清CRP阳性率显著高于外周血WBC阳性率,差异有统计学意义(P <0.05)。VP组血清PCT阳性率均显著高于血清CRP及外周血WBC的阳性率,差异有统计学意义(P <0.05)。重症肺炎组外周血WBC和血清CRP、PCT水平均显著高于轻症肺炎组,差异有统计学意义(P <0.05)。结论外周血WBC水平对BP具有一定的诊断价值,血清CRP浓度有助于鉴别VP与非VP,血清PCT含量则有助于鉴别BP与非BP,且3项指标联合检测能更好地区分不同感染病原体类型的小儿肺炎,并与患儿病情的严重程度密切相关。