重度肺炎患儿血清Clara细胞分泌蛋白16和肺表面活性蛋白D水平及临床意义

Determination of Clara cell secretory protein 16 and pulmonary surfactant protein D in children with severe pneumonia and its clinical significance

目的探讨肺炎患儿血清Clara细胞分泌蛋白16(CC16)、肺表面活性蛋白D(SP-D)的变化及其临床意义。方法选取社区获得性肺炎患儿81例,其中重度肺炎机械通气组(21例)、重度肺炎非机械通气组(30例)与轻度肺炎组(30例),对照组为同期体检健康儿童(20例);采用ELISA法检测四组儿童血清CC16、TNF-α、IL-6、SP-D浓度,运用ROC曲线评价CC16、TNF-α、IL-6、SP-D对于重度肺炎的诊断价值;记录机械通气患儿肺动态顺应性(Cdyn)、气道阻力(Raw)、气道峰压(PIP)、呼吸做功(WOB)等呼吸力学参数,分析CC16与TNF-α、IL-6、SP-D及呼吸力学参数间的相关性。结果肺炎组患儿血清CC16浓度均明显低于对照组,重度肺炎组低于轻度肺炎组,机械通气组低于非机械通气组;肺炎组患儿血清TNF-α、IL-6、SP-D浓度均明显高于对照组,重度肺炎组高于轻度肺炎组,机械通气组高于非机械通气组,差异均有统计学意义(P<0.05)。与撤机前相比,重度肺炎组机械通气1小时血清CC16浓度明显降低,机械通气72小时更低;而机械通气1小时血清TNF-α、IL-6、SP-D明显升高,机械通气72小时更高,差异均有统计学意义(P<0.05);与撤机前相比,重度肺炎组机械通气72小时,Cdyn值明显下降,机械通气1小时更低;而机械通气72小时Raw、PIP、WOB值明显升高,机械通气1小时更高,差异均有统计学意义(P<0.05)。血清CC16浓度与TNF-α、IL-6、SP-D均呈负相关,与Cdyn呈正相关(P均<0.01)。ROC曲线中,CC16、TNF-α、IL-6、SP-D诊断重度肺炎的曲线下面积分别为0.905、0.704、0.832、0.825(P均<0.01)。结论社区获得性肺炎患儿血清CC 16、SP-D浓度与疾病严重程度相关;机械通气患儿CC 16浓度水平与Cdyn呈正相关关系;CC16对于重度肺炎病情变化具有较好的预测及评价作用。

Objective To explore the changes of serum Clara cell secretory protein 16 （CC16）, pulmonary surfactant protein D （SP-D） in children with pneumonia and its clinical significance. Methods A total of 81 pediatric patients with community-acquired pneumonia were selected, including severe pneumonia with mechanical ventilation group （n=21）, severe pneumonia with non-mechanical ventilation group （n=30）, mild pneumonia group （n=30）, and the control group （n=20） was selected in the physical examination of healthy children over the same period. We detected the concentration of serum CC16, TNF-α, IL-6 and SP-D for the 4 groups by ELISA, and evaluated the clinical values of serum CC16, TNF-α, IL-6 and SP-D for severe pneumonia by using ROC curve. We recorded pulmonary dynamic compliance （Cdyn）, airway resistance （Raw）, peak inspiratory pressure （PIP）, work of breathing （WOB） and other respiratory mechanical parameters, and analyzed the correlations between CC16 and TNF-α, IL-6, SP-D and respiratory mechanical parameters. Results The concentrations of serum CC16 in pneumonia group were all significantly lower than that in the control group, and those in severe pneumonia groups were lower than that in mild pneumonia group, and mechanical ventilation group was lower than that in non-mechanical ventilation; the concentration of serum TNF-α, IL-6 and SP-D in pneumonia groups were all obviously higher than that in the control group, and severe pneumonia group were higher than that in mild pneumonia group, and those in mechanical ventilation group were also higher than that in non-mechanical ventilation group （P〈0.05）. Compared to that before removing the ventilator, concentration of serum CC16 in severe pneumonia with mechanical ventilation group decreased significantly at 1 hour and lowered down at 72 hours; but the concentration of serum TNF-α, IL-6 and SP-D in severe pneumonia with mechanical ventilation increased significantly at 1 hour and went higher at 72 hours, the differences were all statistically significant （all of P〈0.05）; compared to that before weaning from the ventilator, the value of Cdyn decreased obviously in severe pneumonia with mechanical ventilation at 72 hours and lowered down at 1 hour; but the values of Raw, PIP, WOB in severe pneumonia with mechanical ventilation increased obviously at 72 hours and more higher at 1 hour, the differences were all statistically significant （all of P〈0.05）. The concentration of serum CC16 showed all negative correlations with TNF-α, IL-6 and SP-D, but it showed positive correlation with Cdyn （ all of P〈0.01）. In the ROC curve, the area under the ROC curve of CC16, TNF-α, IL-6 and SP-D in serum was 0.905, 0.704, 0.832, 0.825, respectively （for all of which P〈0.01）. Conclusion The concentrations of serum CC16 and SP-D were associated with the severity of community acquired-pneumonia in children. The level of serum CC16 was positive associated with Cdyn in children with mechanical ventilation. CC16 has better prediction and evaluation effect on the change of severe pneumonia.