ABSTRACT
Objective:To explore the association between vitamin A, E and recurrent respiratory tract infections (RRTIs) in children.Methods:1 853 children with RRTIs and 2 695 health children were separately selected as cases and controls. Propensity score matching (PSM) analysis were conducted to reducing confounding bias between groups. Blood samples were collected to measure serum levels of vitamins A and E by high performance liquid chromatographie (HPLC). Paired logistic regression was used to determine odds ratios ( OR) and 95% confidence intervals ( CI) to evaluate the association of RRTIs with the serum levels of vitamin A and E. Results:After propensity score estimation and 1∶1 matching, the study cohort included 1 507 cases with RRTIs and 1 507 health children as controls. The main characteristics between the two groups were all not significantly different after matching ( P>0.05). The average levels of vitamin A in two groups were different ( P<0.05). Paired logistic regression analysis showed that greater serum levels of vitamin A had a lower risk of RRTIs ( OR=0.46, 95% CI: 0.22-0.98), similarly, deficiency of vitamin A would also increase the risk of RRTIs ( OR=1.18, 95% CI: 1.00-1.38). The statistical difference was not found between VitE and RRTIs ( P>0.05). Conclusions:The serum levels of vitamin E didn′t have a statistically significant association with RRTIs. However, we observed an obvious association between vitamin A and RRTIs. Hence vitamin A clinical monitoring and supplementation are vital for preventing and treating RRTIs.
ABSTRACT
Objective To explore the interleukin-4 (IL-4),interleukin-6 (IL-6),interferon-gamma (IFN-γ) levels in bronchoalveolar lavage fluid (BALF) of children with refractory mycoplasma pneumoniae pneumonia,and the features of bronchoscopy.Methods A total of 47 children with refractory mycoplasma pneumoniae pneumonia were selected as the observation group,28 children with bronchial foreign body in GAN zhengyan were chosen as controls during the same period.ELISA method was used to detect the IL-4,IL-6,IFN-γ levels in the BALF,and compared them in these two groups.The bronchoscope features of the observation group were observed.Results The IL-4,IL-6,IFN-γ levels in the BALF of children in the observation group were (8.3 ± 3.1) pg/mL,(62.3 ± 18.4) pg/mL,(76.5 ± 21.9) pg/mL,and they were significantly higher than those of the controls (3.1 ± 1.2) pg/m L,(30.0 ± 1.5) pg/m L,(31.3 ± 24.9) pg/mL (P ＜0.05,respectively).In the observation group,the bronchial mucosa congestion and edema were observed in all patients,there were variable amounts of mucus secretions.There were other changes include:microtubule reductus (68.1％),bronchial mucosal follicle-like hyperplasia (38.3％),mucosal erosions (8.5％),airway inflammatory stenosis,mucus plug blocking (59.6％),granulation proliferation (14.9％),bronchial obliteration (4.3％) Conclusions The IL-4,IL-6,IFN-γ levels in the BALF of children with RMPP significantly increased.This indicates a significant local inflammatory response in children with RMPP.Mycoplasma pneumoniae pneumonia (MPP) has certain features of bronchoscope,these features are helpful to the diagnosis and treatment of MPP.