Relationship between surfactant associated protein-A in bronchoalveolar lavage fluid and lung function in children with refractory mycoplasma pneumoniae pneumonia / 新乡医学院学报

ABSTRACT

Objective To investigate the relationship between surfactant associated protein-A(SP-A) in bronchoalveolar lavage fluid(BLAF) and lung function in children with refractory mycoplasma pneumoniae pneumonia(RMPP).Methods Thirty children with RMPP were selected from January 2015 to December 2016 in the People's Hospital of Hebi City.The partial pressure of oxygen in artery (PaO2),partial pressure of carbon dioxide in artery (PaCO2),forced expiratory volume in one second(FEV1) and forced vital capacity (FVC) of the children were detected at acute and convalescent periods.The BALF was collected by bronchoalveolar lavage,and the level of SP-A in BALF was detected by enzyme linked immunosorbent assay.Results The level of SP-A in BALF of children with RMPP at ac ute and convalescent period was (3.63 ± 0.09) and (5.86 ± 0.17)mg · L-1 respectively,the level of SP-A in BALF of children with RMPP at acute phase was significantly lower than that at convalescent period(t =-63.499,P ＜ 0.05).The PaO2 and PaCO2 in children with RMPP at acute phase were (49.25 ±7.32) and (47.16 ±6.48)mmHg respectively,and they were (76.54 ±6.48) and (36.20 ± 5.61)mmHg respectively at convalescent period;the PaO2 in children with RMPP at acute phase was significantly lower than that at convalescent period (t =-15.289,P ＜ 0.05),and the PaO2 in children with RMPP at acute phase was significantly higher than that at convalescent period(t =7.004,P ＜ 0.05).The FEV1,FVC and FEV1/FVC in RMPP children at acute phase were (1.36 ±0.67),(1.68 ± 0.31) L and 69.85 ± 8.34 respectively;and they were (1.89 ± 0.58),(1.99 ± 0.53) L and 87.32 ± 9.52 respectively at convalescent period;the FEV1,FVC and FEV1/FVC in RMPP children at acute phase were significantly lower than those at convalescent period(t =-3.276,-2.765,-7.560;P ＜ 0.05).The level of SP-A in BALF of children with RMPP was positively correlated with PaO2 (r =0.921 6,P ＜ 0.05),but there was no significant correlation between SP-A level and PaCO2 (r =1.211 4,P ＜ 0.05).The level of SP-A in BALF was positively correlated with FEV1,FVC and FEV1/FVC (r =0.831,0.905,0.803;P ＜ 0.05).Conclusion The level of SP-A in BALF was positively correlated with lung function of children with RMPP.The detection of SP-A level in BALF is helpful to assess the lung function and pathogenetic condition of children with RMPP.