AIM: To investigate the possible role of endothelin(ET-1) in asthma pathogenesis and the effect of atrial natriuretic factor (ANF) on changes of ET-1. METHODS: Measuring the contents of endothelin-1(ET-1),atrial natriuretic factor(ANF),cGMP in plasma and bronchoalveolar lavage fluid (BALF) of guinea pigs. RESULTS: The contents of ET-1, ANF and cGMP in asthma group were higher than that of the control group; There was a significant negative correlation between ET-1 and ANF( r=-0.638,P

Objective To investigate the distribution of etiological agents in children with asthma exacerbation in Chongqing during 2013 .Methods Four hundred and forty seven cases of hospitalized children with asthma exacerbation in 2013 in Children′s Hospital of Chongqing Medical University were retrospectively analyzed in SPSS19 .0 software .Results Among the 447 children with asthma exacerbation ,the percentage of bacteria was 43 .8% ,streptococcus pneumonia(SP)(25 .5% ) was the most common bacteria .Among the 25 cases with bacteria culture of bronchoalveolar lavage ,the positive rate was 44 .0% ,and the difference to sputum culture was not significant (P>0 .05) .The positive rate of 7 common respiratory viruses was 27 .3% ,RSV accounted for 18 .8% ,and it was the most common virus .The virus infection rate was higher in the groups below one years old ,and compared each groups′virus detection rates ,the difference was significant (P< 0 .05) .The positive rate of mycoplasma pneumoniae was 23 .5% ,chlamydia pneumonia was not detected .Conclusion Asthma exacerbation in children is closely related to respiratory infec‐tion .Bacteria detection rate was high in all ages ,which suggests that bacterial infection is an important factor in asthma exacerbation that can′t be ignored .

Objective To approach the risk factors of bronchopulmonary dysplasia(BPD)with very low birth weight infants whose gestational age less than 32 weeks,thus it could provide a basis direction for prevention.Methods To summarize 70 neonates with BPD in October 2012 to October 2014 in our hospital, and randomly select 70 very low birth weight infants didn't have oxygen requirement of gestation age less than 32 weeks as control group.The perinatal risk factors,oxygen therapy and use caffeine were analyzed by using the statistical analysis of Chi-square test and logistic regression,so the risk factors and prevention direc-tion of BPD could be provided.Results Male gender were more prone to BPD(P ﹦0.000).Gestational age (P ﹦0.000)and birth weight(P ﹦0.002)were statistical lower in infants with BPD compared with no BPD.Family history of asthma,fetal distress,amniotic fluid turbidity,pulmonary hemorrhage,respiratory dis-tress syndrome,use of pulmonary surfactant,patent ductus arteriosus,intrauterine infection,ventilator time,na-sal continuous positive airway pressure /nasal intermittent positive pressure ventilation time,duration of oxy-gen therapy and use of caffeine were statistical significances (P 〈0.05,respectively).Logistic regression analysis demonstrated that gender(OR ﹦3.574,P ﹦0.003),gestational age≥28 weeks(OR ﹦58.665,P ﹦0.002), birth weight 〈1 250 g(OR ﹦36.453,P ﹦0.012)and ventilator time(OR ﹦703.696,P ﹦0.000)were independent risk factors for BPD infants.Using of caffeine(OR ﹦0.025,P ﹦0.010)and nasal continuous positive airway pressure/nasal intermittent positive pressure ventilation(OR ﹦0.004,P ﹦0.002)were protective factors for BPD infants. Conclusion The incidence of BPD could be reduced by strengthening prenatal care,minimizing intrauterine in-fection and preterm delivery,reducing the patent ductus arteriosus by strict fluid management,using mechanical ventilation rationally,choosing a non-invasive mechanical ventilation and caffeine.

Objective To analyse the clinic characteristics of adenovirus pneumonia in children and have a good understanding of the clinical features of adenovirus pneumonia in children .Methods The clinical data of 99 cases with adenovirus pneumonia during January 2011 to June 2013 were reviewed .Clinical manifestation ,auxiliary examination and treatment were analyzed .Results All 99 patients had fever ,heat process was long and were prone to complications ,including :35 cases of respiratory failure ,27 cases of pleu-ral effusion ,11 cases of atelectasis and 52 cases of myocardial damage .Adenovirus pneumonia was easily combined with other path-ogenic infections .Streptococcus pneumoniae was the most common bacterial pathogens and respiratory viruses were the most com-mon virus .The radiographic features of chest of adenovirus pneumonia were in both lungs exudative ,and really variable .Adenovirus pneumonia in bronchoscopy showed bronchial inflammation .Treatment of adenovirus pneumonia was the comprehensive treatment . Conclusion The condition of adenovirus pneumonia is serious and the number of complications is large .Adenovirus pneumonia could easily cause secondary bacterial infection .There is no specific treatment for adenovirus pneumonia .Clinicians should pay more attention .

Objective To evaluate the effect of clinical pathway management on pediatric capillary bronchitis. Methods Infants with capillary bronchitis admitted to our hospital were selected. Several indices were compared between the infants with and without clinical pathway management including hospital stay, costs of hospitalization, satisfaction in parents of children, cure rate, readmission rate one week after discharge, hospital infection and variation in the process of clinical pathway manage-ment. Results A total of 204 eligible infants were divided into research group (n=96) and control group (n=108). There were no signiifcant differences in sex, age, respiratory rate, heart rate and temperature, and detection rate of respiratory syncytial virus in nasopharyngeal secretion and sputum culture (P>0.05). Compared with the infants in control group, the total drug costs, the an-tibiotics costs and the average length of stay were signiifcantly decreased in infants with clinical pathway management (P<0.05). There were no signiifcant differences in such indices as satisfaction in parents of children, cure rate, readmission rate one week after discharge and hospital infection rate between two groups (P>0.05). In research group, 49 infants (51.04%) completed the clinical pathway management. Positive variance was found in 43 infants (44.79%) and negative variance in 4 infants (4.17%). Two infants (2.08%) dropped out. Conclusions For capillary bronchitis in infants, clinical pathway management has an effect on controlling and reducing the medical expenses, and meanwhile improving the medical quality and satisfaction of patients.

Background Oscillatory potentials (OPs) of scotopic electroretinogram (ERG) plays an important role in the evaluation of visual function in multiple retinal diseases.However,the origin of OPs is uncompletely clear.It is essential to analyze the time domain and frequency domain components for the further study of OPs.Objective The present study was to investigate the change characteristics of frequency spectrum of scotopic OPs with age and stimulating intensity.Methods RCS-rdy+-p+rats with the ages of 21,25,32,35,37,46,60,90 days were selected iu this study and 3 rats for each.Scotopic flash ERG were recorded from all the rats with RETI-scan system.Gold-foil ring cornea recording electrode was used as the recording electrode and the steel needle electrode was used as the reference and earth electrode during the record.The intensity of stimulating light was set at-20,-10,-5,0 and 5 dB respectively.Data were output into the computer and processed by the software Matlab7.0.Results The principle frequency corresponding to maximum amplitude component was 80-120 Hz in the various ages of rats under the different stimulating conditions above.With the increase of the intensity of stimulating light,high frequency component (200-250 Hz) began to appear and the amplitudes showed a gradually raise upon the intensity of light.The major component was subdivided into two peaks at 0 dB stimulation.Further,the age affected the major frequency peak with the maximum value at 60-day-old rats and the minimum value at 25-day-old rats.Also,the pass-band width of main amplitude appeared to be maximal at 60-day-old rats and minimal at 25-day-old rats.Conclusions OPs in Rcsrdy+-p+ rats are influenced by stimulating intensity and agc.Stimulating intensity affects the amplitude and age lead to the change of distribution of primary frequency of OPs.It is possible to know the influences of the degeneration of rods and be helpful to diagnosis this kind of disease.

Objectives To summarize the clinical feature of severe adenovirus pneumonia (SAP) in children and further to improve prognosis and clinical diagnosis of SAP. Methods The clinical data of 213 children with SAP from June 2009 to June 2011 were retrospectively analyzed. Results Among 213 patients, 155 (72.8%) children were aged 6 months to 2 years, with a males to females ratio of 2.7∶1. The onset of 158 patients (74.2%) was in winter and spring. All patients had fever, 172 (80.8%) with high temperature of 39.1℃-41℃, 161 (75.6%) with a fever lasting more than 2 weeks. Two hundred and ifve (96.2%) patients had cough in the early stage, 120 (56.3%) with wheeze, 139 (65.3%) with moist rales and wheezing in the lung. Imaging ifndings in the preliminary stage of SAP showed that 63 patients (92.6%) had pulmonary interstitial changes;in critical stage, 80 patients (54.4%) had segmental consolidation and 33 (22.4%) with pleural effusion, 25 (17.0%) with pleuritis;in recovery phase, 50 patients (68.5%) showed absorption in segmental area of consolidation. All cases had complications, 175 (82.2%) with respiratory failure, including 10 (4.7%) with ARDS;among extrapulmonary complications, diseases of cardiovascular system (64.3%) and alimen-tary system (44.1%) were the most common ones, and the occurrence of myocarditis and diarrheal disease were the highest. Age, ARDS and more than two kinds of complications had adverse impact on the outcomes, and the difference was signiifcant (P<0.05). Conclusions SAP is a severe pneumonia with long duration of high fever, severe clinical manifestations with more complications. When SAP is suspected, it is recommended to complete etiological and chest radiographic examination for early diagnosis and treatment.

Objective: Lung metastases are common in patients with differentiated thyroid carcinoma (DTC). Post-therapeutic 131I-whole-body scan (WBS) was conventionally administered after the radioactive iodine treatment (RAI) of DTC lung metastases. This study aimed to investigate the influencing factors of WBS imaging on the RAI of DTC lung metastases. Methods:DTC patients (n=60) with lung metastases treated with 131I were retrospectively included. Before treatment, the thyroid function was assessed. Neck and chest computed tomography (CT) was performed, and WBS was inspected. Patients with lung metastases were classified into negative and positive subgroups according to the imaging of 131I WBS, and the relative influencing factors were analyzed. Results:Univariate analy-sis showed that age and chest CT imaging, which revealed pulmonary fibrosis, calcification, and patchy shadows, were related to WBS imaging. Binary variable logistic regression analysis revealed that pulmonary fibrosis (OR=0.175, P<0.001) and calcification (OR=0.088, P<0.05) went against the development of WBS. Conclusion:WBS imaging on RAI of lung metastases was not obvious in the el-derly. The fibrosis, calcification, and patchy shadows of the lung were not conducive for WBS imaging. The fibrosis and calcification of the lung were the main factors that affect WBS imaging.

Background RCS-rdy--P+ rat occur retinitis pigmentosa (PR) with the aging and development.To find OUt the retinal functional change using electrophysiological technique is useful for the further study of RCS-rdy--P+ rat. Ohjectlve The goal of this experiment was to investigate the dark-adapted electroretinogram (ERG) of RCS rats with aging. Methods The series of seotopic ERG were recorded in postnatal 21-,32-,37-,45-,60-day-old RCS-rdy--P+ rats respectively,and the age-matched RCS-rdy+-P+ rats were simultaneously recorded as control group.The ERG record was performed by a series of flash with RETI-scan system,gold-foil ring form cornea recording electrode and home-made stainless steel needle electrode.The use of animals complied with the Regulations of the Administration of Affair Concerning Experimental Animals by State Science and Technology Commission. Results Increase dark adaptation duration led to an ascended amplitude in ERG b-wave within 12 hours under the same light intensity,frequency and body temperature.Compared with the RCS-rdy+-P+ rats,the amplitudes of scotopic ERG a-wave and b-wave in RCS-rdy--P+ rats with postnatal 21 days age were apparently declined,showing significant difference between them(P<0.01).The implicit time of both RCS-rdy+-P+ rats and RCS-rdy--P+ rats were delayed, especially for the a-wave. The amplitudes of a-wave and b-wave were declined drastically with the growth of RCS-rdy--P+ rats and progression of their retinal degeneration, and the ERG responses were undetectable at the postnatal 60 days. Both the b-wave and a-wave amplitudes were lowered at P21-day RCS-rdy+-P+ rats and after that,significant increase amplitudes were noted till the P32-day rats. Thereafter, the b-wave amplitude and a-wave amplitude were stable from P32 d to P45 d,and much more ascending of b-wave and a-wave amplitudes was at P60 d RCS-rdy+-P+ rats. Conclusion RCS-rdy--P+ rats occur the retrogression of retinal function along with the ages growth. The scotopic ERG changes of RCS-rdy--P+ rats with aging is evidently different and is in accordance to the characteristics of the RP.

Objective To investigate the effects of ischemic preconditioning on pneumocyte apoptosis and the expression of HSFT0 after lung isehemia-reperfusion(I/R) in rats and discuss its possible mechanism of extenu-ating ischemia-repedusion injury. Method Thirtysix male Sprague-Dawley rats were randomly divided into three groups [ sham operation(SO ) group, ischemia-teperfusion(L/R) group, and ischemic preconditioning(IP) group],twelve in each group. Lung croas-clamping was used to build the L/R model. In IP group, three cycles of 5-minute-ischemia + 5-minute-reperfusion were given to the pulmonary artery before the procedure. Sham operation rats had a thoracotomy only. Two hours(or five hours) reperfusion was given to both L/R and IP group. Tenninal-deoxynucleotidyl Transferase Mediated d-UTP Nick End Labeiing(TUNEL) was used to evaluate apoptosis. Expression of HSP/0 in lung was observed by immunohistochemical stain and image analysis. Index of quantitative assessment of histologic lung injury(IQA), wet to dry weight ratio(W/D) were measured. The pathological change of lung tissue was observed under both hght and electron microscopy. Statistical analysis was carried out by One-way Anova. Scheffe test was used for intragroup comparison. Results The apoptosis index and expression of HSP70、W/D,IQA of hng tissue in I/R group were higher than those in the sham operation group (P<0.01). Compared with the L/R group, the apoptosis index and expression of HSP70, W/D, IQA of lung tissue significantly decreased (P<0.01), the levels of expression of HSPTO increased significantly in IP group ( P<0.01 ). The pathological and ultrastructure change of lung tissue was better in IP group than those in I/R group. Condusions Ischemic preconditioning can extenuate lung I/R injury by the possible mechanism of increasing the expression of HSPT0 which inhibits the apoptosis during lung I/R injury.