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Biomedical subjects

W Zachgo

Publications and source records attributed to W Zachgo.

8 recordsLinked to original sources
PubMed2000

The effect of repeated ozone exposures on inflammatory markers in bronchoalveolar lavage fluid and mucosal biopsies.

The aim of this study was to investigate the cellular and biochemical events associated with repeated exposures to ozone. Twenty-three healthy subjects underwent single exposures to 200 ppb ozone and to filtered air (FA), as well as repeated exposures to 200 ppb ozone on 4 consecutive days, each for 4 h of intermittent exercise. Bronchoalveolar lavage was performed and mucosal biopsies were taken 20 h after the single or the last of the repeated exposures. As compared with FA, the single exposure to ozone caused a decrease in FEV(1), an increase in the percentages of neutrophils and lymphocytes, the concentrations of total protein, IL-6, IL-8, reduced glutathione, urate, and ortho-tyrosine in BAL fluid (BALF), but no changes in the cellular composition of biopsy. After the repeated exposure, the effect on lung function was abolished and differential cell counts in BALF were not significantly different from those after FA. However, the concentrations of total protein, IL-6, IL-8, reduced glutathione, and ortho-tyrosine were still increased. IL-10 could only be detected in BALF after repeated ozone exposures. Furthermore, macroscopic scores for bronchitis, erythema, and hypervulnerability of airway mucosa were increased, as well as numbers of neutrophils in bronchial mucosal biopsies. Our data demonstrate that airway inflammation persists after repeated ozone exposure, despite attenuation of some inflammatory markers in BALF and adaptation of lung function.

Adult↗
PubMed1994

Diagnosis of localized Pneumocystis carinii and Aspergillus growth in two HIV-infected patients by ultrasonically guided percutaneous lung biopsy.

The diagnostic value of ultrasonic (US) examinations followed by US-guided needle biopsy in the differential diagnosis of peripheral pulmonary infiltrates is demonstrated examining two patients with AIDS-related pulmonary infiltrates. Ultraso-guided needle biopsy was performed after thoracic radiograph, computed tomography, and bronchoscopy could not confirm a diagnosis. Biopsy specimens obtained via US-guided needle biopsy revealed local Pneumocystis carinii (case 1) and chronic Aspergillus pneumonia (case 2).

AIDS-Related Opportunistic Infections↗
PubMed1991

Quantitative skin prick and bronchial provocation tests with platinum salt.

Occupational asthma due to platinum salts is a frequent disease in platinum refineries. The diagnosis is based upon a history of work related symptoms and a positive skin prick test with platinum salts. Bronchial provocation tests have not been performed in epidemiological studies because the skin test is believed to be highly specific and sensitive. As no reliable data about this issue currently exist, this study assesses the use of skin prick and bronchial provocation tests with methacholine and platinum salt in platinum refinery workers. Twenty seven of 35 workers, who were referred to our clinic with work related symptoms and nine control subjects with bronchial hyperreactivity underwent a skin prick test and bronchial provocation with methacholine and platinum salt. For skin prick and bronchial provocation tests with platinum salt a 10(-2)-10(-8) mol/l hexachloroplatinic acid solution, in 10-fold dilutions was used. Four of the 27 subjects and all controls showed neither a bronchial reaction nor a skin reaction. Twenty three subjects were considered allergic to platinum salt; 22 of these showed a fall of 50% or more in specific airway conductance after inhalation of the platinum salt solution. Four workers experienced a positive bronchial reaction despite a negative skin prick test. No correlation of responsiveness to methacholine with responsiveness to platinum salt was found, but the skin prick test correlated with the bronchial reaction to platinum salt (rs = 0.50, p less than 0.023, n = 22). One dual reaction was seen in bronchial provocation tests. Side effects of both skin tests and bronchial provocation tests with platinum salt were rare and were not encountered in workers without a skin reaction to platinum salt. It is concluded that bronchial provocation tests with platinum salts should be performed on workers with work related symptoms but negative skin tests with platinum salts.

Adult↗
PubMed1991

Tribolium confusum (confused flour beetle, rice flour beetle)--an occupational allergen in bakers: demonstration of IgE antibodies.

Specific IgE to proteins from Tribolium confusum (TC), a flour beetle, was detected in 9/125 sera of subjects exposed to rye and wheat flour. TC RAST was not inhibited by Dermatophagoides pteronyssinus, rye or wheat flour. Immunoblot experiments showed specific binding to three proteins from adult TC or pupae, not present in rye or wheat flour. These findings suggest that TC might act as an occupational allergen in a proportion of bakers.

Allergens↗
PubMed1991

[Para-pleural lung lesions: diagnostic value of sonography versus computerized tomography].

UNLABELLED: 45 patients with pleural and/or peripheral lung lesions detected by chest radiography were examined by chest ultrasound. A chest CT-scan was obtained as a reference method afterwards. In 43 pleural or peripheral lung lesions we found corresponding results comparing size, invasivity and nature comparing the two diagnostic methods. In 35 of 41 cases an ultrasound (US)-guided needle biopsy confirmed the preliminary diagnosis suspected after sonography of the chest. Six needle biopsies allowed no definite diagnosis. Two patients developed a pneumothorax that required drainage after US-guided needle biopsy. CONCLUSION: Real-time sonography of the chest and chest CT-scans are complementary methods examining pleural and peripheral lung lesions, corresponding results are demonstrated in respect of location, size, invasivity and nature of the lesions.

Biopsy, Needle↗
PubMed1990

Histamine release from basophils after in vivo application of recombinant human interleukin-3 in man.

Interleukin 3 (IL3) is known to stimulate progenitor cell proliferation and maturation as well as differentiated cell functions, e.g. direct or anti-IgE-mediated histamine release (HR). We investigated 14 patients with malignant diseases being treated with recombinant human IL3 (rhuIL3) as a daily subcutaneous bolus injection for 15 days. For analysis, patients were combined in a 'low-dose' [30 (n = 1), 60 (n = 3) and 125 (n = 2) micrograms/m2/day] and a 'high-dose' [250 (n = 6) and 500 (n = 2) micrograms/m2/day] therapy group. In the high-dose group there was a 2-fold increase in total leukocytes, and 8-fold increase in basophils, and a 23-fold increase in eosinophils. Histamine content per basophil decreased rapidly after rhuIL3 administration. Anti-IgE-induced HR increased in a dose-dependent manner after rhuIL3 therapy (low-dose group: HRmax 47.5 vs. 53.3%; high-dose group: HRmax 57.8 vs. 75.4%, p less than 0.05). In contrast to anti-IgE-induced HR, HR with ionophore (78.0 vs. 50.3%, p less than 0.05), FMLP (32.3 vs. 11.4%, p less than 0.05), sodium chloride (31.8 vs. 22.6%, n.s.) and mannitol (56.3 vs. 47.8%, n.s.) decreased. There was no histamine release from basophils upon in vitro stimulation with rhuIL3 alone. The kinetics of the increase in anti-IgE-induced histamine release did not parallel the rapid histamine depletion of cells. We conclude that rhuIL3 therapy may cause a rapid HR from basophils which cannot be observed after stimulation of cells in vitro. The clinical importance of this HR remains unclear as side effects could not be correlated with HR.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1990

[Quantitative skin test and inhalation provocation test in asthma using platinum salts].

In this article, the in vivo test results obtained from workers of two platinum separating plants are described. A total of 30 out of 102 workers in two platinum separating plants and 0/40 control subjects showed a positive skin reaction on being provoked with platinum compounds. Twelve out of 15 workers and none of 5 control subjects showed a positive reaction to the bronchial provocation test; this indicates that both tests are highly specific. Three workers with negative skin test reactions showed a clearly positive immediate reaction to the bronchial provocation test with platinum compounds.

Bronchial Provocation Tests↗