PHYSIOLOGICAL TESTING OF CARBON NANOTUBES: ARE THEY ASBESTOS-LIKE?

To determine whether carbon nanotubes can induce any significant health hazards we applied methods routinely used in the pathophysiological testing of asbestos-induced disease to show that the soot with a high content of CNTs does not induce any abnormalities of pulmonary function or measurable inflammation in guinea pigs treated with carbon nanotubes.     

Inhaled glucocorticosteroids in treatment of bronchial asthma

Studies of bronchial asthma pathogenesis, conducted over many years, have shown that inflammatory process plays a major role in the development of this disease. Glucocorticosteroids are agents with strongest antiinflammatory activity and together with beta 2-agonists are thought of as firstline therapy in the treatment of bronchial asthma. New inhaled glucocorticosteroids are preparations with small systemic activity, despite the fact, that some of them are more lipophyllic than the others, despite the differences in solubility, affinity to lung tissue, different serum concentrations and affinity to receptors. Even with the tremendous progress in increasing efficacy and lowering side effects of inhaled glucocorticosteroids, no ideal preparation was found so far, however the antiinflammatory activity was increased and the dose lowered, which means increasing clinical efficacy and lowering the systemic effects. Only in the future we can hope for developing an ideal preparation of inhaled glucocorticosteroid with common specificity towards lung tissue and direct influence on the target cell, and maybe even on a specific gene.     

Analysis of deaths during the course of status asthmaticus in patients treated at the Acute Asthma Center in the Pneumonology Clinic of the Warsaw Medical School in the years 1991-1996]

In the Acute Asthma Treatment Center (OLSA) in the Department of Pneumonology of Warsaw Medical School in years 1991-1996, 582 patients with status asthmaticus were treated. The causes of status asthmaticus were bronchial asthma in 317 patients and COPD in 265 patients. Status asthmaticus was the cause of death in 21 patients treated in OLSA, which accounts for 3.6% of the total. 10 subjects were admitted with symptoms of brain death, who underwent resuscitation on their way to hospital. This study retrospectively analyzes the clinical characteristics (age, sex, PaCO2, pH, PaO2, time of mechanical ventilation and duration of treatment in ICU) of patients who died in status asthmaticus. They were divided into two groups: patients with asthma and COPD. A significant difference (p < 0.01) was detected between those two groups only in patients age. Mean duration of mechanical ventilation was 151 h in asthmatic and 104 h in COPD group. Mean duration of the OLSA stay was 19.5 days in the first and 7.4 days in the second group. The following fatal complications were observed: 2 cerebral strokes, 4 cardiac infarctions, 3 pneumothoraces, 2 atelectasis, 4 pneumonia, 1 case of gastric hemorrhage and 1 hemorrhage to mediastinum.     

Evaluation of the incidence of clinical symptoms and risk factors for COPD based on the monitoring of refinery workers in Piock (1993-1996)

Work place environment plays an important role in development diseases because of the time spend in and different toxic factors placed in it. The aim of study was to assess the ventilatory efficiency in individuals employed in Generating Plant (GP) in relation to the pollution of the work place and the tobacco smoking habit during 3 years. The study covered a group of 144 male individuals employed at GP. (age 39.3 +/- 8.7 yrs, period of employment 20.3 +/- 8.6 yrs, smokers 53.5%. Lung function tests consisted of VC, FVC, FEV1, FEV1%VC, PEF, FEF50 counted from flow-volume curve and TGV, Rt measured using pletysmographic method. All tests were performed using pletysmograph (Masterlab) "Jaeger" placed on the ambulance near to the work place. The measurements were taken in May 1993 and 1996. Results were compared to with normal values (acc. ECSC). The anamnesis was obtained from all workers in the form of questionnaire projected for this study. All measurements were done during work time (9.00 a.m. to 2.00 p.m.). Mean values of the ventilation indices remained within the normal range but comparing results in smokers and non-smokers group significant differences in FEV1 and TGV were found. The symptoms of chronic bronchitis were present in 20.8% of persons. Spirometric criteria for the COPD diagnosis were found in 16 persons (11%). Only 5 persons (31%) were symptomatic. The mean decrease of FEV1 was 16.2 ml/yr, in the COPD group it was 82.5 ml/yr. The greater annual loss of FEV1 was found in the smokers and symptoms groups.     

Interstitial lung disease in systemic sclerosis: comparison of BALF lymphocyte phenotype and DLCO impairment

Patients with scleroderma (systemic sclerosis-SSc) frequently develop an interstitial lung disease. The role of lymphocytes in fibrosing alveolitis preceding lung fibrosis has been established. The purpose of this work was to evaluate cell profiles and lymphocyte phenotypes in the bronchoalveolar lavage (BAL) fluid and to correlate them with depression in lung function tests detected by depletion of diffusing capacity (DLCO). BAL was carried out in 25 untreated, non-smoking patients suffering from diffuse scleroderma and in 12 healthy non-smoking volunteers. For the analysis of lymphocyte sub-sets flow cytometry and monoclonal antibodies were used. The following cell sub-types were counted: T lymphocytes, B lymphocytes, helper lymphocytes, suppressor/cytotoxic lymphocytes, natural killer cells, cytotoxic T lymphocytes and activated T lymphocytes. The total cell count was higher in the group of patients with mild and moderate impairment in DLCO. The percentage of lymphocytes was greater in patients with DLCO lower than 65% of the predicted value since neutrophilia was found in patients with severe DLCO depletion, i.e. significant when compared with healthy subjects. The proportions of suppressor/cytotoxic lymphocytes and of activated T lymphocytes were higher in patients than in controls. The statistical analysis revealed significant differences between patients with moderate and mild changes in DLCO and the healthy volunteers. A decreased helper/suppressor ratio was noticed in these patients. We concluded that the BALF lymphocyte phenotype analysis may reflect the features of alveolitis in patients with SSc.