中性粒细胞CD64和降钙素原联合检测在新生儿细菌感染早期诊断中的价值

目的探讨血清中性粒细胞CD64和降钙素原(PCT)联合检测在新生儿细菌感染早期诊断中的价值。方法将37例细菌感染新生儿依据出院诊断分为败血症组(n=15)和一般感染组(非败血症患儿;n=22);并选取同期住院非感染新生儿作为对照组(n=21)。各组新生儿均于入院后即刻抽取静脉血,采用流式细胞术检测血清中性粒细胞CD64表达,化学发光法和免疫透射比浊法分别检测血清PCT及CRP水平。结果败血症组血清中性粒细胞CD64、PCT、CRP水平高于对照组(P0.01);一般感染组中性粒细胞CD64水平高于对照组(P0.01);败血症组血清PCT、CRP水平高于一般感染组(P0.01)。中性粒细胞CD64、PCT、CRP诊断细菌感染的曲线下面积分别为0.818、0.818、0.704,均低于中性粒细胞CD64与PCT联合诊断细菌感染的曲线下面积(0.926)。中性粒细胞CD64与PCT联合检测在早期诊断新生儿感染的灵敏度和准确度分别为97.29%和89.65%,较CRP联合中性粒细胞CD64或PCT检测的灵敏度和准确度均高,较中性粒细胞CD64、PCT及CRP单项检测的灵敏度和准确度更高。结论中性粒细胞CD64、PCT联合检测能显著提高新生儿细菌感染诊断的灵敏度及准确度,有助于早期识别细菌感染。

Value of combined determination of neutrophil CD64 and procalcitonin in early diagnosis of neonatal bacterial infection

Objective To investigate the value of combined determination of neutrophil CD64 and procalcitonin (PCT) in the early diagnosis of neonatal bacterial infection. Methods According to discharge diagnosis, 37 neonates with bacterial infection were divided into sepsis (n=15) and ordinary infection (non-sepsis) groups (n=22). Twenty-one neonates without infection who were hospitalized during the same period of time were enrolled as the control group. Venous blood samples were collected immediately after admission. Flow cytometry was used to measure the serum level of neutrophil CD64. Chemiluminescence and immune transmission turbidimetry were used to measure the serum levels of PCT and CRP respectively. Results The sepsis group had higher serum levels of neutrophil CD64, PCT, and CRP than the control group (P<0.01), the ordinary infection group had a higher serum level of neutrophil CD64 than the control group (P<0.01), and the sepsis group had higher serum levels of PCT and CRP than the ordinary infection group (P<0.01). The areas under the ROC curve (AUC) of neutrophil CD64, PCT, and CRP in diagnosing bacterial infection were 0.818, 0.818, and 0.704 respectively, and the AUC of combined neutrophil CD64 and PCT was 0.926. A combination of neutrophil CD64 and PCT had a sensitivity of 97.29% and an accuracy of 89.65% in the early diagnosis of neonatal bacterial infection.The sensitivity and accuracy were higher than those of a combination of CRP and neutrophil CD64 or PCT as well as neutrophil CD64, PCT, or CRP alone for the early diagnosis of neonatal bacterial infection. Conclusions The combined determination of neutrophil CD64 and PCT can improve the sensitivity and accuracy in the diagnosis of neonatal bacterial infection, which helps with early identification of bacterial infection.