Epidemiology and clinical characteristics of Mycoplasma pneumoniae pneumonia in hospitalized children younger than three year-old / 中国小儿急救医学

Objective To summarize the epidemiology and evaluate possible age-related differences in the presenting clinical features in three year-old children with Mycoplasma pneumoniae pneumonia(MPP)during 2009 to 2014.Methods The medical records of 17855 children with community-acquired pneumonia enrolled by Children′s Hospital of Soochow University during 2009 to 2014.Totally 1145 younger than three year-old children with MPP were enrolled,and they were classified into three groups of 1 month to 1 year-old group (n=512),1 to 2 year-old group (n=393) and 2 to 3 year-old group (n=240).The epidemiology and possible age-related differences in the presenting clinical features,main laboratory and imaging results in three year-old children with MPP were summarized.Results (1) The highest infection rate of different reasons in Suzhou was in autumn(10.46%),and the lowest was in spring(6.95%),The highest infection rate of different ages was 2 to 3 year-old group(11.61%),and the difference was statistically significant (P<0.05).(2) Compared with 1 month to 1 year-old group(n=512,4.31%) and 1 to 2 year-old group (n=39,10.09%),2 to 3 year-old group (n=240,11.61%) had higher infection rate,more patients with fever(53.9% vs. 77.1% vs. 85.4%) and high fever(16.8% vs. 30.5% vs. 41.4%),longer time to normalization of temperature(3d vs. 5d vs. 6d),but less patients with wheezing(61.3% vs. 52.4% vs. 42.9%) and dyspnea(7.6% vs. 4.6% vs. 3.8%).(3) The differences were statistically significant in the percentage of neutrophils,lymphocytes,CRP and platelet count between different ages(P<0.001).(4) The incidences of large area of lesions in chest X-ray examination among different ages had significant differences(P<0.001).Conclusions MP is one of the important pathogens of respiratory tract infection in younger than 3 year-old children.It can occur in every season,and the highest infection rate of MP is in autumn and spring.In younger than 3 year-old,older patients are more vulnerable to infection of MP,the number of fever and high fever are more,fever duration is longer,but younger patients are more vulnerable to virus infection and prone to dyspnea.Chest X-ray examination shows small patchy shadow in most cases,the younger children are more easily to have large area of lesions and pleural effusion.

Clinical features of protracted bacterial bronchitis in children / 中华儿科杂志

<p><b>OBJECTIVE</b>To analyze the clinical characteristics of protracted bacterial bronchitis (PBB) in children.</p><p><b>METHOD</b>The clinical data of patients seen from October, 2010 to March, 2014 in Department of Respiratory Diseases of our hospital were retrospectively analyzed. Inclusion criteria were over 4 weeks cough, receiving fiberoptic bronchoscopy, positive bacterial culture and (or) the increased percentage of neutral granulocytes in bronchoalveolar lavage fluid (BALF).</p><p><b>RESULT</b>Twenty eight patients were involved, 26 were male (93%) and two were female (7%). The median age of patients was 8.5 months. The median duration of cough was four weeks. The average length of hospital stay was (8.3 ± 3.9)days. The main clinical feature was wet cough in 28 cases, wet cough with wheezing was seen in 21 cases. The wet cough phase distribution was irregular in 21 cases. The crackles with wheeze (in 21 cases) was main signs of PBB. The percentage of CD3⁻ CD16⁺ 56⁺ cells increased in peripheral blood. The fiberoptic bronchoscopic manifestations of PBB were luminal mucosal edema. Eleven patients also had airway malacia. The neutrophil median in BALF was 0.2. The positive rate of bacterial culture of BALF was 36%. The main bacteria were Streptococcus pneumoniae (50%) and Haemophilus influenzae (30%). The main treatment for PBB patients included amoxycillin/clavulanate potassium and second-generation cephalosporins. The average duration of treatment was (17.3 ± 3.2)days, the prognosis was good.</p><p><b>CONCLUSION</b>PBB is common in male infants. Persistent wet cough with wheezing was the main characteristic of PBB. PBB is commonly accompanied by immune dysfunction and airway malacia, and the pathogens were Streptococcus pneumoniae and Haemophilus influenzae.</p>

Genotyping analysis of epidemic strains ofMycoplasma pneumoniae in Suzhou area / 临床儿科杂志

ObjectiveTo analyze the genotype and variation ofMycoplasma pneumonia (MP) strains isolated from chil-dren with MP infection in Soochow area.MethodsThe nasopharyngeal secretions from hospitalized children with MP infection were collected during January 2012 and December 2013. The nested-multiplex PCR based on MPP1 gene was performed to detect the subtype ofMP gene.ResultsIn 313 samples, 304 (97.12 %) samples were classiifed as P1-I type and 8 (2.56%) sam-ples were classiifed as P1-II type and one (0.32%) was V2 variant. Gene sequencing results were consistent with nested-multiple PCR results.ConclusionsNested-multiplex PCR is a reliable method for genotyping of MPP1 gene. During the study period, P1-I type was the common genotype and only one case of V2 variant was found.

Diagnostic and management effect of bronchoscopy on mycoplasma pneumonia with pulmonary atelectasis in children / 中国小儿急救医学

Objective To explore the clinical characteristics of mycoplasma pneumonia with pulmonary atelectasis and lavage interventional effect through fiberoptic bronchoscopy in children.Methods During Jun 2012 to Apr 2013,fifty-three children diagnosed of mycoplasma pneumonia with pulmonary atelectasis who received fiberoptic bronchoscopy were enrolled as the experimental group.Thirty-five children diagnosed of mycoplasma pneumonia without pulmonary atelectasis were chosen as control group.According to the lavage interventional time of fiberoptic bronchoscopy,we divided the patients in the experimental group into two groups,the early group and late group.Clinical data and laboratory finds were collected and analyzed.Results The duration of fever,hospital stay and C-reactive protein (CRP) of the experimental group were significantly higher than those of the control group (P ＜ 0.05).The location of pulmonary atelectasis in the experimental group were usually in the right middle lobe (18 cases,33.9％).Under fiberoptic bronchoscope,all patients had obviously bronchial mucosa congestive edema.Some of them had follicular hyperplasia (9 cases,17.0％),mucosal erosion (3 cases,5.7％),mucus plug formation (7 cases,13.2％) and poor ventilation of segmental bronchi (4 cases,7.5 ％).Neutrophils (43 cases,81.1％) increased and phagocytic cells (31 cases,58.5％) dereased obviously in bronchoalevolar lavage fluid.After treatment in the experimental group,52 children (98.1％) got complete recruitment of atelectasis.The average duration of fever and hospital stay of the early group were significantly shoter than those of late group (P ＜ 0.05).Conclusion Children diagnosed of mycoplasma pneumonia with pulmonary atelectasis had longer fever duration and higher CRP level.Bronchoscopic interventional therapy promoted the recovery of pulmonary atelectasis.Using bronchoscop early in shorten the duration of fever and hospitalization in children diagnosed of mycoplasm pneumonia with pulmonary atelectasis.