Natural ingredients from Chinese materia medica for pulmonary hypertension / 中国天然药物

Pulmonary hypertension (PH) is a severe pathophysiological condition characterized by pulmonary artery remodeling and continuous increases in pulmonary artery pressure, which may eventually develop to right heart failure and death. Although newly discovered and incredible treatment strategies in recent years have improved the prognosis of PH, limited types of effective and economical drugs for PH still makes it as a life-threatening disease. Some drugs from Chinese materia medica (CMM) have been traditionally applied in the treatment of lung diseases. Accumulating evidence suggests active pharmaceutical ingredients (APIs) derived from those medicines brings promising future for the prevention and treatment of PH. In this review, we summarized the pharmacological effects of APIs derived from CMM which are potent in treating PH, so as to provide new thoughts for initial drug discovery and identification of potential therapeutic strategies in alternative medicine for PH.

Diagnosis and treatment strategy for advanced severe lung cancer / 中国实用内科杂志

Advanced severe lung cancer means the stage IIIB, IIIC, and IV lung cancer patients with a PS score of 2 to 4 points due to various related causes of lung cancer itself or the complication of anti-tumor drugs, with a high probability of benefiting from the existing systemic anti-tumor treatments. The diagnosis and treatment strategies emphasize the implementation of minimally invasive dynamic monitoring mutation targets and curative effects. Every drug that is useful to the patient should be used as possible, and making the best use of every drug as possible with the help of respiratory support therapy. Specific treatment concepts include combination therapy,alternating medication, paying equal attention to systemic therapy and local therapy, PS score assessment, upgrading and downgrading of drug use, and simultaneous treatment of cancer and lung itself.

Indoor Allergen Levels and Household Distributions in Nine Cities Across China / 生物医学与环境科学（英文）

<p><b>OBJECTIVE</b>Chinese allergic subjects have high levels of sensitization to house dust mite (HDM) and other indoor allergens. This study quantifies common indoor allergen levels in Chinese households.</p><p><b>METHODS</b>Dust samples were collected from nine cities. Major allergens Der p 1 and Der f 1 from Dermatophagoides pteronyssinus and D. farinae, and specific antigens of Blomia tropicalis, Tyrophagus putrescentiae, Acarus siro, and cockroach species Blattella germanica and Periplaneta americana were measured by ELISA.</p><p><b>RESULTS</b>HDM allergens were found in dust samples from bedding in 95% of the Chinese households. The median levels varied from <0.006 to 9.2 µg/g of dust, depending on the city. The percentages of households having HDM allergen levels associated with the risk of developing allergy sensitization and asthma were 65% and 25%, respectively. Specific antigens of the storage mite and cockroach were only found in samples from the southern and tropical regions of China. Levels of mite allergens were generally higher in samples from bedding compared to samples from the living room, even for storage mites, whereas levels of cockroach antigens were higher in the living room samples.</p><p><b>CONCLUSION</b>HDM allergens are present in bedding dust samples from most Chinese households. Cities in southern and central China have relatively high levels of HDM major allergens compared to cities in northern and western China. Antigens of storage mites and cockroaches are not as common as HDM allergens.</p>

Association between awareness of smoking-related evidence and smoking cessation treatments provided by hospital chest physicians in Guangzhou, China: a multi-institutional cross-sectional survey / 中华流行病学杂志

<p><b>OBJECTIVE</b>Factors associated with smoking cessation interventions initiated by hospital chest physicians in China had not been studied. We examined if the physicians' awareness of emerging evidence regarding negative effects of smoking was associated with the initiation of smoking cessation.</p><p><b>METHODS</b>A cluster randomized cross-sectional survey was conducted from July 2011 to August 2011 in hospital-based chest physicians (n = 354) in Guangzhou, China.</p><p><b>RESULTS</b>Of those who responded (n = 354, 92.2%), 63.8% were aware of emerging evidence regarding negative effects of smoking and 64.5% initiated smoking cessation programs with their patients who smoked. Regarding the related awareness on smoking differed across physicians depending on their affiliation to evidence hospitals(χ(2) = 54.7, P > 0.001), i.e., primary (44.9%), secondary (55.1%)and tertiary hospitals (87.0%)was further supported by the related odds ratio (OR = 1.732, 95%CI:1.072-2.797, P < 0.05). Smoking status of physicians was related to their practice on smoking cessation, supported by the odds ratio (OR = 4.251, 95% CI:1.460-12.380, P = 0.008). Smoking cessation practice by physicians also depended on their affiliated hospitals. Physicians working at primary and secondary hospitals were less aware of the fact that smoking could reduce patients' responsiveness to inhaled corticosteroids than those working at the tertiary hospitals(χ(2) = 37.9, P > 0.001). Furthermore, these physicians would less frequently prescribed medication related to smoking cessation(χ(2) = 137.71, P < 0.001).</p><p><b>CONCLUSION</b>Physicians who were better aware of the health hazards of smoking might more actively provide smoking cessation advice in their clinics. The awareness might correlate with the hospital levels they worked and the smoking status while the the advice they provided might correlate with their educational background, job title, department affiliation and smoking status, but not with the level of hospitals.</p>

Evaluation of the efficacy and safety of tiotropium bromide (5 µg) inhaled via Respimat in Chinese patients with chronic obstructive pulmonary disease / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>A pharmacokinetic study in an Asian population showed that tiotropium 5 µg via Respimat leads to the same plasma levels compared to 18 µg via HandiHaler. The objective of the trial was to compare the efficacy and safety of longterm treatment (1 year) with tiotropium bromide (5 µg) via Respimat® with placebo in patients with chronic obstructive pulmonary disease (COPD).</p><p><b>METHODS</b>A total of 3991 patients were randomized in this double-blind, placebo controlled, parallel group study, while in China 338 patients (309 males, 29 females) received either tiotropium bromide (n = 167) or placebo (n = 171). Tiotropium bromide solution or matching placebo was delivered via Respimat® at a dosage of 5 µg (2×2.5 µg/puff) once daily for 48 weeks. Co-primary endpoints were trough forced expiratory volume in one second (FEV1) and the time to first exacerbation.</p><p><b>RESULTS</b>Statistically significant improvements in trough FEV1 and trough forced vital capacity (FVC) in the tiotropium group were achieved at weeks 4, 24, and 48 compared with those in the placebo group. A statistically significant difference (P = 0.0027) in favour of tiotropium was also observed for the time to first exacerbation. The total numbers of exacerbations during treatment were 90 and 128 in the tiotropium and placebo groups, respectively, with a rate ratio of 0.69 (P = 0.0164). The difference between the treatment groups in the adjusted mean changes from baseline of St. George Respiratory Questionnaire (SGRQ) total score was -3.9 (95% CI: -7.5, -0.2) and was of statistical significance (P = 0.0367). The incidences of serious adverse events (SAEs) in the tiotropium and placebo groups were 16.2% and 17.0%, respectively. Seven deaths occurred whilst patients were on treatment, four in the tiotropium group and three in the placebo group, all of which were assessed as non-related study drugs by the investigators.</p><p><b>CONCLUSIONS</b>Tiotropium significantly improved lung function and quality of life, delayed the time to first exacerbation, reduced the number of exacerbations. Overall, tiotropium was well tolerated.</p>

Visualization of Peripheral Pulmonary Artery Red Thrombi Utilizing Optical Coherence Tomography

Optical coherence tomography (OCT) is a new imaging technique capable of obtaining high-resolution intravascular images and has been used in interventional cardiology. However, an application of OCT in pulmonary arteries had seldom been documented. In this case, OCT imaging is performed in peripheral pulmonary arteries and shows mural red thrombi. Subsequently, the red thrombi are aspirated and confirmed by a histological examination. These findings suggest that OCT may be a useful tool to depict peripheral pulmonary artery thrombi.

Indoor mite allergen levels, specific IgE prevalence and IgE cross-inhibition pattern among asthmatic children in Haikou, southern China / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Haikou locates in tropical island with unique mite propagation. The aim of this stuy is to determine mite allergens levels in Haikou, and to investigate the prevalence of mite specific IgE-sensitization and IgE cross-reactivity between house dust mites.</p><p><b>METHODS</b>Allergen and antigen concentrations against six mite species were tested by enzyme-linked immunosorbent assay (ELISA). Specific IgE concentrations and cross-inhibitions were measured with ADVIA Centaur(®).</p><p><b>RESULTS</b>Allergen or antigen Dermatophagoides pteronyssinus (Der p 1), Blomia tropicalis (Blo t) and Tyrophagus putrescentia (Tyr p) were detected in dust samples. Dermatophagoides farinae (Der f 1), Lepidoglyphus destructor (Lep d 2), and Acarus siro (Aca s) were found in very few samples. Specific IgE tests showed high prevalence of sensitizations against all tested mites with high IgE levels to Der p, Der f, and Blo t. Storage mites, Blo t, Tyr p, Lep d, and Aca s, could inhibit Der p from 0 to 50%. Storage mites could inhibit Der f between 30% and 100%. Der p IgE could be inhibited by Der f with up to 90%, and vice versa. Der p could inhibit Blo t from 40% to 80%. Blo t was able to fully inhibit IgE binding to Lep d, Tyr p, and Aca s compared to partial inhibition by Der p.</p><p><b>CONCLUSIONS</b>Der p is the dominating mite and has the highest specific IgE prevalence among asthmatic children. Blo t represents an important source of storage mite sensitization and some patients may be independently sensitized to both Der p and Blo t. High prevalence of sensitization to Der f may be due to IgE-mediated cross-reactivity with Der p and Blo t.</p>

Using optical coherence tomography to detect peripheral pulmonary thrombi / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Optical coherence tomography (OCT) is a new imaging technique capable of obtaining high-resolution intravascular images of small vessels and has been widely used in interventional cardiology. However, application of OCT in peripheral pulmonary arteries in patients has been seldom documented.</p><p><b>METHODS</b>Three patients who were highly suspected peripheral pulmonary arteries thrombi and had undergone CT pulmonary angiography but tested negative for thrombi in peripheral pulmonary arteries were enrolled. Subsequently, OCT imaging was performed in peripheral pulmonary arteries. The patients received more than three-month anticoagulative treatment if thrombi were detected by OCT. Thereafter, OCT re-evaluation of the thrombolized blood vessels detected earlier was performed. The changes of thrombi before and after anticoagulative treatment were compared.</p><p><b>RESULTS</b>Three patients underwent OCT imaging of peripheral pulmonary arteries. Thrombi were found in most of imaged vessels in these patients. Red and white thrombi can be differentiated, according to features of the thrombus on OCT images. After anticoagulation treatment, these patients' symptoms and hypoxemia improved. Repeated OCT imaging showed that most thrombi disappeared or became smaller.</p><p><b>CONCLUSION</b>OCT may be used as a potential tool for detecting peripheral pulmonary artery thrombi and differentiating red thrombi from white ones.</p>

Preliminary establishment of cytological examination and the normal reference values for hypertonic saline solution-induced sputum of healthy children in Guangzhou / 中华儿科杂志

<p><b>OBJECTIVE</b>To establish the method of cytological examination and the normal reference values for hypertonic saline solution-induced sputum of healthy children (age range from 5 to 15 years) with physical examination in Guangzhou.</p><p><b>METHOD</b>A total of 352 children, 5 to 15 years old, were enrolled from primary school and middle school in Guangzhou from January to December, 2010. All subjects completed a standardized questionnaire on the presence of respiratory, allergic symptoms and family history, the medical history and the physical examination was performed by doctors, lung function (forced expiratory volume at 1 s in predicted normal, FEV(1)%) was determined. There were 266 healthy children (137 males, 129 females) who were selected and undergone hypertonic saline solution induction of sputum, and cytological examination was performed. Hypertonic saline (5%) was nebulized and inhaled for 15 - 30 min. No expectoration within 30 min was defined as failure, and the procedure was terminated. The part of opaque and higher density sputum samples was detected by cytology. The proportion of neutrophils, lymphocytes, eosinophils, macrophages and monocytes was calculated. This study was approved by the institutional Ethics Review Committee of First Affiliated Hospital of Guangzhou Medical College. Informed consent was obtained from the legal guardians of all participants following a detailed description of the purpose and potential benefits of the study.</p><p><b>RESULT</b>There were 175 subjects' induced sputum specimens (175/266, 65.8%), non-qualified sputum samples were obtained from 16 of the subjects. The proportions of median (IQR) of lymphocytes were 0.012 (0.020), 95%CI were ranged from 0.015 to 0.022; neutrophils 0.207 (0.330), 95%CI 0.266 - 0.356 macrophages 0.761 (0.327), 95%CI 0.607 - 0.699; eosinophils 0.004 (0.019), 95%CI 0.013 - 0.022. There were no significant differences in proportions of cytological findings of female or male, different age groups and second-hand smoking or not (all P > 0.05). The incidence of adverse event was 4.40% (7/159).</p><p><b>CONCLUSION</b>The method and the preliminary data may be used for research, diagnosis and treatment of patients with chronic cough and airway inflammation.</p>

Clinical characteristics of bronchiolitis obliterans in pediatric patients / 中华儿科杂志

<p><b>OBJECTIVE</b>To analyze the clinical characteristics, image findings, laboratory examination, the therapeutic methods and clinical outcomes of bronchiolitis obliterans (BO) in pediatric patients.</p><p><b>METHOD</b>Twenty-six pediatric patients with BO were reported. All data were collected from cases who were hospitalized in the Department of Pediatrics, First Affiliated Hospital of Guangzhou Medical College from June 1(st), 2009 to the April 30(th), 2011, and infectious agents, clinical manifestations, risk factors, changes in imageology, laboratory examination, therapeutic methods and treatment responses were analyzed.</p><p><b>RESULT</b>The ranges of age at onset was 4.5 months-8 years in 26 cases (18 boys and 8 girls). The course of disease was (6.2 ± 3.5) months. The period of followed-up ranged from 2 to 24 months. The common clinical characteristics were persistent wheezing of different severity (26 cases, 100%), cough (24 cases, 92%), intolerance to exercise (22 cases, 85%), short of breath (21 cases, 81%), retraction (20 cases, 77%), wheezy phlegm (16 cases, 62%), keeping with crackles (10 cases, 38%), cyanosis around the mouth (3 cases, 12%) and no clubbed fingers (toes). In 18 cases the etiology was detected, mycoplasma (11 cases, 42%), respiratory syncytial virus (4 cases, 15%), parainfluenza virus (2 cases, 8%), influenza virus A (2 cases, 8%) and influenza virus B (2 cases, 8%), human bocavirus (HBoV) (1 case, 4%). There were 8 cases (31%) with combined infection. Chest X-ray in 10 cases indicated changes suggestive of bronchopneumonia (38%), in only 1 case there was an image of interstitial pneumonia disease (4%). All the patients were diagnosed by high-resolution computerized tomography (HRCT). All cases were demonstrated to have air retention, poor blood perfusion in lung, just like "Westemark sign" with HRCT. In 19 cases antineutrophil cytoplasmic antibody (ANCA) was determined and 10 patients (53%) were positive for P-ANCA, and 8 cases (42%) were positive for C-ANCA. All patients received oral corticosteroid and low doses azithromycin. In 13 cases (50%) the treatment effectively reduced the severity of disease and the frequency of cough and wheezing. The average number of days for symptom improvement was (7.1 ± 4.8) days.</p><p><b>CONCLUSION</b>Respiratory infection plays an important role in BO in children. The chronic and persistent wheezing, cough, intolerance to exercises, short breath, retraction were the main clinical manifestations. But these symptoms are non-specific. Chest X-ray can not provide enough information for diagnosis. Classical "Westemark sign" with HRCT is an important sign. ANCA with a high positive rate (approximately 50%) suppose immuno-lesion in BO. Oral corticosteroid and methotrexate may relieve clinical symptoms.</p>

Incidence and prevention of venous thromboembolism in acutely ill hospitalized elderly Chinese / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>As the third most frequent cardiovascular disease, venous thromboembolism (VTE) remains a major cause of morbidity and mortality in hospitalized patients. The aim of this study was to determine the incidence of VTE and steps for its prevention in acutely ill hospitalized elderly Chinese patients.</p><p><b>METHODS</b>A prospective multi-center study was conducted from June 2006 to November 2007. A total of 607 patients from 40 research centers in China were enrolled. Data of the patients' baseline characteristics, VTE events and prophylaxis/therapy methods were collected.</p><p><b>RESULTS</b>Fifty-nine patients (9.7%) had an objectively confirmed VTE during the 90-day follow-up, of which, 59.3% occurred during the first week and 75% within 14 days. Forty-one patients died (6.6%) during the follow-up, 36.6% died within three weeks. We also found that medical disorders including respiratory failure (16.4%), acute brain infarction (15.6%), acute infectious diseases (14.3%), acute coronary artery syndrome (8.7%) and heart failure (7.6%) play a role in provoking VTE. Only 13.0% of the elderly patients with high risk of VTE used low dose unfractionated heparin, 7.1% used low molecular weight heparin, 5.4% used warfarin, 0.3% used graduated compression stockings and none of them used intermittent pneumatic compression.</p><p><b>CONCLUSIONS</b>Our study showed similar results between our study and western countries in the VTE incidence by day 90 in elderly hospitalized patients with acute medical illness. Great caution must be applied in the care of acutely ill elderly hospitalized patients to deal with the complications of VTE. Application of safe and effective prophylaxes against embolism remains a critical challenge.</p>

Allergen micro-array detection of specific IgE-reactivity in Chinese allergy patients / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Allergen micro-arrays are powerful tools for screening of serum IgE-reactivity. In this study allergen micro-arrays were used to identify dominating IgE-binding allergens and cross-reactivity patterns among selected Chinese allergy patients.</p><p><b>METHODS</b>The study was conducted using patient sera from the cities of Guangzhou, Nanjing, Chengdu and Shenyang. In total 100 sera with Dermatophagoides pteronyssinus (Der p) specific IgE-levels higher than 50 kU/L were selected for testing against 103 individual allergens.</p><p><b>RESULTS</b>Among 100 selected patients, 95% showed IgE-reactivity towards house-dust mite allergens Dermatophagoides farinae (Der f) 1, Der f 2 and Der p 2 and 94% were IgE positive against Der p 1, and 60% of sera contained IgE reacting against allergen Euroglyphus maynei (Eur m) 2. IgE against cat allergen, Felisdomesticus (Fel d) 1, was seen in 20%. Only 2% showed specific IgE-reactivity to Der p 10, a panallergen belonging to the tropomyosin family. Serum IgE-reactivity towards other allergens was in general low. IgE-reactivity against pollen allergens showed geographic differences.</p><p><b>CONCLUSIONS</b>This study clearly confirms that group 1 and group 2 are major allergens of house dust mites. These selected house-dust mite allergy patients are close to being mono-sensitized. Der p 10 is not an important allergen for cross-reactivity. Specific IgE-sensitization towards pollen allergens is low in southern China compared to other regions. The prevalence of food and stinging insect allergens known to give rise to IgE-mediated cross-reactivity is 2% or less.</p>

Liver X receptor agonist T0901317 inhibits TGF-β1-induced α-SMA expression in normal human lung fibroblasts / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the effect of liver X receptor agonist T0901317 on transforming growth factor-β1 (TGF-β1)-induced expression of α-smooth muscle actin (α-SMA) in normal human lung fibroblasts.</p><p><b>METHODS</b>Primary normal human lung fibroblast isolated from the lung specimens of lung cancer patients by explant culture technique were identified with immunostaining for vimentin and keratin. The cells in passages 4 to 10 were treated with T0901317 and/or TGF-β1, and RT-PCR, Western blotting and immunofluorescence assay were used to detect α-SMA expression in the fibroblasts.</p><p><b>RESULTS</b>Lung fibroblast expressed vimentin but not keratin. The results of RT-PCR, Western blotting and immunofluorescence assay all showed that normal human lung fibroblasts constitutively expressed α-SMA under baseline condition, and TGF-β1 at 5 ng/ml induced a significant upregulation of α-SMA both at the mRNA and protein levels. Liver X receptor agonist T0901317 (5 µg/ml) significantly inhibited TGF-β1-induced upregulation of α-SMA expression.</p><p><b>CONCLUSION</b>Liver X receptor agonist T0901317 can inhibit the upregulation of α-SMA in normal human lung fibroblasts induced by TGF-β1, suggesting the potential value of liver X receptor agonist in the treatment of lung fibrosis.</p>

The effects of a hot water soluble extract (S-03) isolated from Isatis indigotica root on influenza A and B viruses in vitro / 病毒学报

This study was to investigate the antiviral effects of a hot water soluble extract S-03 isolated from Isatis indigotica root on different subtypes of influenza A and B viruses in MDCK cell cultures, using plaque reduction, immunofluorescence and hemo-agglutination inhibition (HAD) assays. Chemical analysis of the extract S-03 showed that it contained high proportion of polysaccharides. The antiviral effects in vitro showed that the S-03 had no effect on different influenza viruses if the drug was used before virus adsorption, but S-03 showed obvious activities against influenza viruses if treatment after virus adsorption or direct reaction of drug and virus before virus adsorption. Hemagglutination inhibition assay showed that S-03 inhibited HA activities of different human influenza viruses (inhibition concentration ranged from 3.12 to 25 mg/mL), avain influenza viruses (inhibition concentration ranged from 25 to 50 mg/mL). The antiviral effects of S-03 on different influenza A and B viruses in vitro might be through the inhibition of the HA to prevent infection.

Clinical significance of virulence-related genes of type III secretion system of Pseudomonas aeruginosa / 中华烧伤杂志

<p><b>OBJECTIVE</b>To study the clinical significance of virulence genes exo U and exo S of type III secretion system (TTSS) of Pseudomonas aeruginosa (PA).</p><p><b>METHODS</b>One hundred and eighty-nine clinical isolates of PA were collected from five hospitals. The incidence of virulence genes exo U and exo S in PA were determined with PCR. Minimum inhibitory concentration of anti-bacterial drug for PA was determined with microdilution method. The clinical features and outcomes of 60 hospitalized patients colonized or infected with exo U+/exo S- positive or exo U-/exo S+ positive PA isolated from sputum were analyzed retrospectively. Data were processed with chi-square test.</p><p><b>RESULTS</b>Among the 189 PA isolates, 85.2% (161/189) harbored TTSS genes, including exo U-/exo S+ type (120 isolates), exo U+/exo S- type (31 isolates), exo U-/exo S- type (7 isolates), and exo U+/exo S+ type (3 isolates). 72.0% (72/100) isolates from sputum and 81.5% (44/54) isolates from blood belonged to exo U-/exo S+ genotype. Compared with those of TTSS-negative isolates, the antimicrobial resistance of TTSS-positive isolates to cefoperazone/sulbactam, ceftazidime, amikacin, and cefepime were lower (with χ² value respectively 10.1, 16.1, 9.3, 33.8, P values all below 0.01). The antimicrobial resistance to all examined drug between exo U-/exo S+ type and exo U+/exo S- type isolates was close (with χ² values from 0.08 to 2.04, P values all above 0.05). Patients detected with exo U+/exo S- positive PA isolated from sputum were significantly associated with PA infection, and they usually had history of tracheal intubation, ICU hospitalization, and combined use of drugs for anti-infection treatment. Patients detected with exo U-/exo S+ positive PA isolated from sputum were significantly associated with PA colonization, which had basic lung disease and better outcome than the former infection type.</p><p><b>CONCLUSIONS</b>The TTSS exists in most clinical isolates of PA. Detection of exo U or exo S of PA isolated from sputum is helpful for the analysis of clinical features and outcome of patients.</p>

Asymptomatic patients of chronic obstructive pulmonary disease in China / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Chronic obstructive pulmonary disease (COPD) has a variable natural history and not all individuals follow the same course. This study aimed to identify the prevalence and characteristics of asymptomatic COPD patients from a population-based survey in China.</p><p><b>METHODS</b>A multistage cluster sampling strategy was used in a population from seven different provinces/cities. All residents (over 40 years old) were interviewed with a standardized questionnaire and spirometry. Post-bronchodilator forced expiratory volume in 1 second (FEV(1))/forced vital capacity (FVC) of less than 70% was defined as the diagnostic criterion of COPD. All COPD patients screened were divided into symptomatic group and asymptomatic group according to the presence or absence of chronic respiratory symptoms. Socio-demographic, personal and exposure variables were collected and analyzed.</p><p><b>RESULTS</b>Among the 1668 patients who were diagnosed with COPD from the 25 627 sampling subjects, 589 (35.3%) were asymptomatic. The age, sex, body mass index (BMI), rural and urban distributions, smoking habit and education levels were similar in the two groups. A total of 64.7% of the asymptomatic patients had no comorbidities. Cardiovascular diseases and lung cancer were more common among symptomatic COPD patients than asymptomatic group. Asymptomatic COPD group were less likely to present with poor ventilation in the kitchen, a family history of respiratory disease and recurrent childhood cough. Asymptomatic COPD patients had significantly higher FEV(1) (73.1% vs. 61.0%), FVC (91.9% vs. 82.0%), and a higher ratio of FEV(1)/FVC (62.9% vs. 58.7%) (all P < 0.001) than symptomatic group. More asymptomatic patients were underdiagnosed (91.9% vs. 54.3%, P < 0.001) than symptomatic patients.</p><p><b>CONCLUSIONS</b>This large population-based survey confirmed a high prevalence of asymptomatic COPD patients in China. More use of spirometry screening test may be important to the early detection of COPD.</p>

Application of capnography and SpO2 measurement in the evaluation of respiratory failure in patients with chronic obstructive pulmonary disease / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the accuracy and potential error range of noninvasive estimation of CO2 pressure (PCO2), arterial O2 pressure (PaO2), and oxygenation index (OI) by measuring the end-tidal CO2 pressure (PETCO2) and pulse oxygen saturation (SpO2) in patients with chronic obstructive pulmonary disease (COPD) and respiratory failure, and assess the feasibility of this method for dynamic monitoring of arterial CO2 pressure (PaCO2) and PaO2 in the primary care facilities where arterial blood gases analysis is not available.</p><p><b>METHODS</b>All the 30 patients with COPD and respiratory failure received routine clinical treatment including bronchodilators, mucolytics, glucocorticosteroid, antibiotics and oxygen therapy (titrated to keep SpO2 above 90%) for 5-7 days. A subgroup of the patients also received NIPPV treatment. All the patients were tested with both the eupnea method and prolonged expiratory method before and after the treatment to obtain the data of PCO2 and SpO2 were respectively performed before and after treatment.</p><p><b>RESULTS</b>The PETCO2 with eupnea (PETCO2(Q)) was 50.72-/+8.93 mmHg, significantly lower than PaCO2 (71.25-/+9.08 mmHg, Plt;0.01), but the PETCO2(P) (70.35-/+8.91 mmHg) was comparable with PaCO2 (P>0.05). Similar results were obtained after the treatment. The PETCO2(P) before treatment and after treatment was positively correlated to PaCO2 (r=0.96 and 0.97, respectively, P<0.01). The PaO2(Y) before the treatment derived from the oxygen dissociation curve based on SpO2 measurement was close to SpO2 (59.96-/+1.42 mmHg vs 59.07-/+2.22 mmHg, P>0.05). The OI derived from PaO2 and OI(Y) from PaO2 (Y) was also similar (215.70-/+22.77 vs 219.15-/+24.63, P>0.05). Linear regression analysis showed positive correlations between PaO2(Y) to PaO2 (r=0.81, P<0.01) and between OI(Y) and OI (r=0.95, P<0.01).</p><p><b>CONCLUSIONS</b>In patients with COPD (especially those with also type II respiratory failure), the modified monitoring method of PCO2 and maintenance of SpO2 above 90% can precisely estimate PaCO2 and PaO2. This method is feasible for clinical noninvasive and dynamic evaluation of respiratory failure in COPD patients, especially in primary care facilities where arterial blood gases analysis is not available.</p>

Prevalence of sensitivity to cockroach allergens and IgE cross-reactivity between cockroach and house dust mite allergens in Chinese patients with allergic rhinitis and asthma / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Cockroaches are an important indoor allergen source causing allergic rhinitis and asthma. The aim of this study was to investigate the cockroach prevalence in mainland of China and the cross-reactivity of IgE between cockroach and house dust mite allergen in Chinese patients.</p><p><b>METHODS</b>The cockroach sensitization pattern was based on a skin prick test (SPT) obtained from a national multicenter prevalence study, in which 6304 patients from 25 allergy centers across China participated. Factors, including different regions of China, age, gender and the correlations between the American and German cockroaches and house dust mite Der p were investigated. Eighteen out of 1236 clinical sera from south China were selected to perform the cross-inhibition assay between house dust mites and cockroaches.</p><p><b>RESULTS</b>Totally 25.7% of patients were SPT positive to the American cockroach (Periplaneta Americana, Per a) and 18.7% SPT positive to the German cockroach (Blattella germanica, Bla g). The prevalence of positive cockroach SPT was higher in southern than in northern China, higher in adults than in children, and higher in males than in females. Patients had relatively low levels of cockroach SPT reactions, mainly class 1 or 2. Of the SPT positive cockroach patients, 88% were also SPT positive to house dust mite (Dermatophagoides pteronyssinus, Der p). An IgE cross-inhibition study confirmed that Der p sensitization could cause false positive SPT reactions against cockroach.</p><p><b>CONCLUSIONS</b>A relatively high prevalence of cockroach sensitivity was found in mainland of China. However, a cross-inhibition study showed that only a small number of patients appear to have Bla g and/or Per a as primary sensitizing source. The importance of cockroaches as a risk factor for sensitization and triggers of allergic symptoms in mainland of China needs to be further investigated.</p>

Measurement of airway resistance and reactivity in guinea pigs using double-chamber plethysmography / 南方医科大学学报

<p><b>OBJECTIVE</b>To establish a method for measurement of airway resistance (sRaw) and reactivity in guinea pigs.</p><p><b>METHODS</b>Methacholine spray at gradient concentrations was given to guinea pigs. PC100 was defined as the concentration of methacholine when the sRaw doubled in the guinea pigs using a double-chamber plethysmograph. The time for the recovery of PC100 resistance to baseline levels was measured. The sRaw and PC100 were measured twice on days 1 and 15 (4 time points) in the guinea pigs before and after OVA challenge.</p><p><b>RESULTS</b>PC100 in a normal guinea pig airway was shown to recover the baseline level within 1 h. Double-chamber plethysmographical measurement of the sRaw and PC100 in normal guinea pigs did not show significant differences between the time points [sRaw: 3.25-/+0.67, 3.33-/+0.58, 3.30-/+0.56, and 3.32-/+0.75 cm H2O.s; log2PC100: 8.48-/+0.94, 8.64-/+1.04, 8.56-/+0.67, and 8.64-/+0.60, respectively, P>0.05]. The sRaw and airway reactivity were significantly increased in guinea pigs challenged with OVA [sRaw: 7.08-/+1.82 vs 2.87-/+0.53 cmH2O.s, P<0.01; log2PC100: 6.64-/+1.26 vs 8.48-/+1.17, P<0.01].</p><p><b>CONCLUSION</b>A double-chamber plethysmography for measurement of sRaw and airway reactivity in guinea pig is established successfully.</p>

Effects of repeated esophageal acid infusion on airway resistance and airway reactivity in guinea pigs and the mechanism / 南方医科大学学报

<p><b>OBJECTIVE</b>To observe the effect of repeated esophageal acid infusion on specific airway resistance (sRaw) and airway reactivity in the guinea pigs and explore the mechanism.</p><p><b>METHODS</b>sRaw and airway reactivity were measured by double-chamber plethysmography in normal control group (group N), saline control group (group NS), and repeated acid irrigation group (group H). The initial measurement was used as the baseline sRaw and airway reactivity (1d1), and 2 h after the initial measurement, sRaw and airway reactivity were measured again (1d2). Similarly, such measurements were repeated on the 15th day for all the guinea pigs (15d1, 15d2) with a 2-h interval. The content of Substance P (SP) and vasoactive intestinal peptide (VIP) in lung tissue, trachea, BALF and ganglion were detected by ELISA.</p><p><b>RESULTS</b>The percent change of sRaw, (15d2-1d1)/1d1 in group H was significantly higher than that in group N. The differences in the airway reactivity of the group N, group NS, and group H were not statistically significant. The SP content in the lung, trachea, ganglion and bronchoalveolar lavage fluid (BALF) in group H was significantly higher than those in group N. The SP content in ganglion showed a significant positive correlation to that in the trachea. No significant differences were found in the VIP content in the lung, trachea, ganglion or BALF between the groups.</p><p><b>CONCLUSION</b>Repeated esophageal acid infusion increases the airway resistance, but not the airway reactivity in normal guinea pigs. SP may be involved in development of high sRaw through the esophageal-tracheobronchial reflex.</p>