中性粒细胞VCS参数在急性细菌感染筛查中的初步应用

目的 探讨中性粒细胞VCS参数在诊断急性细菌感染中的应用价值.方法 利用贝克曼-库尔特五分群(类)血细胞分析仪(LH750)分析112例血培养细菌阳性的急性细菌感染患者和70名成年健康对照者、45例非细菌感染WBC增高组的外周血中性粒细胞平均体积(MNV)、平均高频传导(MNC)、平均激光散射(MNS)参数,以及中性粒细胞的体积分布宽度(NDW),并与传统的WBC计数、WBC分类、细胞形态学、C反应蛋白(CRP)等感染指标进行比较分析.将血液细菌感染组根据WBC总数高低分成A、B、C 3组,A组:WBC<11.0×109/L;B组:11.0 ×109/L≤WBC<15.0×109/L;C组:WBC≥15.0×109/L;根据中性粒细胞(NE)值分为2组:NE<0.85组和NE≥0.85组.结果 急性细菌感染组的MNV、NDW分别为154.17±10.08、24.36±4.14,高于健康对照组的142.09±4.13、19.04±1.97和非细菌感染WBC增高组的150.63±8.14、20.19±4.73,差异有统计学意义(F值分别为20.738、28.190,P均<0.01).而急性细菌感染组的lVlNS为137.15±7.61,低于健康对照组的144.51±4.36和非细菌感染WBC增高组的142.45±7.11,差异有统计学意义(F=5.217,P<0.01).A组的MNV、NDW、MNS分别为148.09±5.76、22.39±1.97、140.07±6.11,B组为152.83±5.75、24.14±1.35、141.44±5.35,C组为164.28±6.49、29.42±5.93、134.27±9.61,与健康对照组间比较,差异有统计学意义(F值分别为24.720、31.642、7.931,P均<0.01);NE%<85%组的MNV、NDW、MNS分别为149.17±9.06、22.59±2.73、141.19±4.34,NE%≥85%组为159.03±10.23、27.64±4.51、135.62±8.95,与健康对照组比较,差异有统计学意义(F值分别为23.970、51.309、19.792,P均<0.01).急性细菌感染组的MNV在临界值(cut-off值)为150时,敏感度为70%,特异度为90%.NDW与中性粒细胞核左移现象相关(r=0.33,P<0.01);当NDW的cut-off值为23时,敏感度为72%,特异度为100%.MNV与NDW的敏感度高于传统的WBC计数(WBC的cut-off值≥11.0×109/L时,敏感度为57%)、NE(NE的cut-off值≥0.85时,敏感度为44%)、中性粒细胞核左移(杆状核以上阶段>5%时,敏感度为66%)、CRP(cut-off值≥10 mg/L时,敏感度为65%)等感染指标.结论 中性粒细胞的MNV、NDW参数在急性细菌感染时能特异而灵敏地反映粒细胞的形态学变化,是诊断细菌感染的一个客观而又快速经济的指标.

The predicting value of neutrophil VCS parameters in the diagnosis of bacterial infection

Objective To investigate the clinical value of mean channel of neutrophil volume (MNV), mean channel of neutrophil conductivity (MNC) and mean channel of neutrophil scatter (MNS) in predicting acute bacterial infection.Methods Peripheral blood samples from 112 patients with positive blood cultures for bacteria,70 healthy subjects and 45 non-infectious subjects with high white blood cell count(WBC) were studied using the Coulter LH 750 hematology analyzer.MNV, MNC, MNS and neutrophil volume distribution width (NDW) were retrospectively analyzed and compared with total WBC, percentage of neutrophils,neutrophil left-shift and CRP.112 blood bacterial infections were grouped according to WBC count (A:WBC ＜11.0×109 /L;B:11.0×109/L≤WBC＜15.0×109 /L;C:WBC≥15.0×109 /L) and neutrophil rate (NE ＜ 0.85 and NE ≥ 0.85 ).Results MNV and NDW increased significantly in septic patients (154.17 ± 10.08,24.36 ± 4.14 ) compared with those of healthy control group (142.09 ± 4.13,19.04 ± 1.97) and non-infectious patients with high WBC group ( 150.63 ± 8.14,20.19 ± 4.73 ).There was statistically significant difference (F value were 20.738 and 28.190 respectively,P ＜ 0.01 ). On the contrary, MNS decreased significantly in septic patients (137.15 ± 7.61 ) compared with that of healthy group (144.51±4.36) and nonspetic patients with high WBC group (142.45±7.11) ,there was significant statistical difference (F=5.217,P＜0.01).The MNV, NDW and MNS of A group were 148.09±5.76,22.39±1.97,140.07±6.11 respectively.The MNV, NDW and MNS of B group were 152.83±5.75,24.14±1.35,141.44±5.35 respectively.The MNV, NDW and MNS of C group were 164.28±6.49,29.42±5.93,134.27±9.61 respectively. There was statistically significant difference compared with healthy group (F value were 24.720,31.642,7.931, P ＜ 0.01).The MNV, NDW and MNS in the group with NE ＜0.85 were 149.17±9.06,22.59±2.73,141.19±4.34 respectively.The MNV, NDW and MNS in the group with NE≥0.85 group were 159.03±10.23,27.64±4.51,135.62 ± 8.95 respectively.There was statistically significant difference compared with healthy group ( F value was 23.970,51.309,19.792,P＜0.01).With a cut-off of 150 for the MNV, a specificity of 90% and sensitivity of 70% were achieved.NDW was associated with neutrophil left-shift (r=0.33,P＜0.01).With a cut-off of 23 for the NDW, a specificity of 100% and a sensitivity of 72% were achieved.The sensitivity of the MNV and NDW was better than total white blood cells count (with a cut-off≥ 11.0×109 /L, the sensitivity was 57% ), percentage of neutrophils( with a cut-off≥0.85, the sensitivity was 44% ) and neutrophil shift to left ( with a cut-off ＞5%, the sensitivity was 66% ) and CRP (with a cut-off ≥10 mg/L, the sensitivity was 65% ).Conclusions The MNV and NDW of the neutrophil can reflect the morphologic change of neutrophil sensitively and specificialy in acute infection. As quantitative, objective and more sensitive parameters, MNV and NDW may have a potential role for predicting the acute bacterial infection.