We assessed the relationship between exposure to silica dust and chronic airflow limitation in an epidemiological survey conducted among pottery workers and controls who were of the same socioeconomic status (average age: 35 y; 78% males). Data were collected by questionnaire for respiratory symptoms, allergy, respiratory history, smoking habits, and occupation. Lung function was measured with a computer-equipped Gauthier spirometer. We excluded subjects with silicosis or doubtful chest x-ray, and two exposure levels were defined. No differences were observed between exposed subjects and controls with respect to respiratory conditions. Mean pulmonary function values for men and women were significantly lower, after adjustment for age, height, and smoking habits, in even indirectly exposed pottery workers, compared with controls. These results suggest that exposure to silica dust is a risk factor for chronic airflow limitation and is independent of radiographic changes.

Adult↗

PubMedDate not supplied

[Experimental study of the effect of membrane oxygenators on the pulmonary structure of the dog and monkey (author's transl)].

Six dogs and 5 monkeys were subject to extracorporeal circulations with membrane oxygenators for various time periods (from 4 to 57 hours). The pulmonary samples, examined with electron microscopy, enabled us to control the appearance of lesions (similar for the two animal species) and to follow their evolution. From the second hour, abnormalities of the capillary endothelium were observed; but at the 6th hour, the lesions had already deeply affected the whole pulmonary structure and became more and more serious. This intrinsic toxicity of membrane oxygenators on the pulmonary structure should incite extreme caution in the use of this method in man.

Animals↗

PubMedDate not supplied

[Experimental study of extra-corporeal circulation with membrane oxygenators: effects on the lung structures of dogs and monkeys (author's transl)].

Six dogs and 5 monkeys underwent extra-corporeal circulations with membrane oxygenators for variable time periods (from 4 to 57 hours). The development and evolution of the lesions, which were similar in the two animal species, were controlled by electron microscopic examination of lung samples. From the 2nd h, abnormalities of the capillary endothelium were observed; but a 6 h, all the inner lung structures were reached and the lesions grew worse with time. Thus, the intrinsic toxicity of membrane oxygenators on lung structures emphasizes that this method should be used with utmost precaution in man.

Animals↗

PubMedDate not supplied

[Treatment of asthma with persistent dyspnea].

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Asthma↗

PubMedDate not supplied

[Bronchiolitis obliterans after lung transplantation].

Lung transplantation has become a realistic treatment in some patients with severe respiratory impairment or severe pulmonary arterial hypertension. Immunosuppression therapy is about the same in all transplantation units and includes cyclosporin, corticosteroids and azathioprine. The diagnosis of acute rejection episodes has been greatly facilitated by the histological study of transbronchial biopsies obtained by endoscopy. Improvements in the short-term prognosis of these patients have made it possible to individualize an unusual and delayed complication: bronchiolitis obliterans. This progressive and diffuse obstruction followed by destruction of the transplant's bronchioles is interpreted as a consequence of chronic rejection. The diagnosis of bronchiolitis obliterans is difficult and rests essentially on degradation of the respiratory function resisting to increased immunosuppression. Some viral infections perhaps contribute to its development, and it may be so severe as to require another lung transplantation.

Bronchiolitis Obliterans↗

PubMedDate not supplied

[Pirbuterol: a new beta 2-sympathomimetic agent. An open multicenter study].

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Adult↗

PubMedDate not supplied

[Interstitial pneumopathies: criteria of drug side-effects. Results of consensus meetings].

Since 1984, the use of the official method for determining the responsibility of drugs in side-effects has been compulsory in France. This method offers, but does not define, different qualificatives for chronological and semeiological criteria. Consensus workshops have been set up to define the undesirable side-effects themselves and the different qualificatives in each of the principal fields of pathology. As regards drug-induced interstitial pneumonia, chest specialists from university hospitals, members of the national system of pharmacovigilance and representatives of the Roussel-Uclaf central department of pharmaco-vigilance have determined: the limits of time elapsed between the beginning and end of drug administration and the occurrence of the adverse reaction; how to interpret various courses of the side-effect with and without temporary discontinuation of the drug, and how to interpret a possible readministration. A list of investigations aimed at excluding the main possible causes of interstitial pneumonia has been drawn up.

Chronology as Topic↗

PubMedDate not supplied

Morphological changes in rat tracheal mucosa immediately after antigen challenge.

We have investigated the morphological effects of an intratracheal challenge with 50 micrograms ovalbumin (OA) on sensitized rat tracheas, in vivo. Female Sprague-Dawley rats were primed ten days before challenge with a single i.t. injection of 100 micrograms OA plus Bordetella pertussis (OA-BP). Two additional groups of animals served as controls: primed animals challenged with saline only and non-primed but OA-challenged animals. Sacrifices--and subsequent morphological studies--were performed prior to and 5, 15 and 60 min after challenge. At each time, the total numbers of epithelial nuclei, subepithelial mast cells (SEMC) and intraepithelial mast cells (IEMC) were scored in six non-adjacent cross sections per trachea. We found that: 1) priming with OA-BP alone did not induce any change in the tracheal mucosa with respect to morphological structure and mast cell counts; 2) no morphological change nor significant modification of the cell counts occurred at any time in tracheas from either of the control groups; 3) in contrast, a luminal heterogeneous exudate and a subepithelial oedema developed in 9 of the 15 tracheas of primed animals within 60 min of OA challenge. In those nine tracheas, the scores of intraepithelial nuclei, of IEMC and of SEMC were found to decrease significantly 15 min after challenge as compared with starting values (p less than 0.05 for each score). The decrease in the number of mucosal mast cells is probably related to the damages of the epithelial cells and to the difficulty with which depleted mast cells can be seen by toluidine blue staining.

Animals↗

PubMedDate not supplied

[Asthmology 1988].

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Asthma↗