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Wild P, Mével H, Penven E, Zmirou-Navier D, Barbaud A, Bohadana A, Paris C. FeNO levels increase with degree of sensitisation in apprentices at risk of occupational asthma. Int J Tuberc Lung Dis 2017; 21:1194-1200. [DOI: 10.5588/ijtld.16.0758] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- P. Wild
- Institut National de Recherche et de Sécurité, Vandoeuvre-lès-Nancy
| | - H. Mével
- Institut National de Recherche et de Sécurité, Vandoeuvre-lès-Nancy
| | - E. Penven
- Occupational Diseases Department, Nancy University Hospital, Nancy
| | - D. Zmirou-Navier
- Department of Environmental and Occupational Health, Ecole des Hautes Etudes en Santé Publique, Rennes, Lorraine University Medical School, Nancy
| | - A. Barbaud
- Lorraine University Medical School, Nancy, Dermatology and Allergy Department, Tenon Hospital, Paris, France
| | - A. Bohadana
- Respiratory Research Unit, Pulmonary Institute, Shaare Zeded Medical Center, Jerusalem, Israel
| | - C. Paris
- Occupational Diseases Department, Nancy University Hospital, Nancy, Lorraine University Medical School, Nancy
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Minary L, Acouetey DS, Wirth N, Martini H, Martinet Y, Bohadana A, Zmirou-Navier D, Alla F. Les facteurs du sevrage dans la population des adolescents en Centre de formation des apprentis. Rev Epidemiol Sante Publique 2013. [DOI: 10.1016/j.respe.2013.07.277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Minary L, Martini H, Wirth N, Thouvenot F, Acouetey S, Maire C, Martinet Y, Bohadana A, Zmirou-Navier D, Alla F. [Tobacco use characteristics among apprentices in Vocational Centers]. Rev Epidemiol Sante Publique 2011; 59:270-6. [PMID: 21752562 DOI: 10.1016/j.respe.2011.02.101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Revised: 12/16/2010] [Accepted: 02/14/2011] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Most smokers start smoking during adolescence and become dependent before 20 years old. In France, vocational trainees are a population not much explored. The objective of our study is to present tobacco use characteristics among apprentices in Vocational Centers (VC). METHODS This cross-sectional exhaustive study covered 1814 students (among whose 943 smokers) entering in a 1st year of the eight participating Vocational Centers in the Lorraine region (Eastern France, 2.3 million inhabitants, 16,500 vocational trainees), during the school years 2007-2008 and 2008-2009. Data collection concerned the sociocultural environment, tobacco use habits, degree of dependency to tobacco and co-addictions. RESULTS Among the study population, 52.0% declared they were smokers among whom 89.4% daily smokers, and 5.7% were ex-smokers. The average age of tobacco use initiation was 12.1 years (standard deviation [SD]=2.1) and the average age at inception of regular cigarette smoking was 13.8 years (SD=1.6). Current consumption of the smokers was 12.8 cigarettes per day (SD=7.8). The average score of smoking addiction was 6.1 (SD=2.8), according to the Hooked On Nicotine checklist test (score from 0 to 10=strongly dependent). Finally, 37.1% of students (58.9% among smokers) smoked or have smoked cannabis. CONCLUSION The high prevalence of smoking in Vocational Centers, the early start of tobacco use and the high tobacco consumption among apprentices show that they are overexposed compared to the general population of adolescents. In addition, these young people are already dependant to tobacco use. This underlines the need of specific measures dedicated to this population that amounts to 361,500 individuals in France.
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Minary L, Acouetey DS, Bohadana A, Wirth N, Martini H, Zmirou-Navier D, Alla F, Martinet Y. Aide au sevrage tabagique pour les adolescents apprentis : le programme TABADO. Rev Mal Respir 2010; 27:663-6. [DOI: 10.1016/j.rmr.2010.06.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Accepted: 04/13/2010] [Indexed: 11/28/2022]
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Abstract
Passive smoking, measured in practice by using specific biomarkers, is a well known factor of morbidity and mortality. The main victims are children, often starting from conception, but adults are not spared. Many respiratory diseases are caused and/or worsened by passive smoking and environmental tobacco smoke (ETS) exposure can have serious health consequences that reduce life expectancy (sudden infant death, respiratory infections, asthma, chronic obstructive pulmonary diseases and lung cancer). Better knowledge of these risks has favourably influenced the legislation banning smoking in enclosed public places in France and in other countries. If one of the main objectives of this measure is to protect non-smokers as well as smokers, its rigorous application fits directly within the goals of prevention and treatment of tobacco dependency.
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Affiliation(s)
- N Wirth
- Unité de Coordination de Tabacologie, Service de Pneumologie, Centre Hospitalier Universitaire de Nancy, France.
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Wirth N, Bohadana A, Spinosa A, Martinet Y. Les pathologies respiratoires liées au tabagisme passif. Rev Mal Respir 2009. [DOI: 10.1016/s0761-8425(09)74711-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wirth N, Bohadana A, Spinosa A, Martinet Y. Les pathologies respiratoires liées au tabagisme passif. Rev Mal Respir 2009. [DOI: 10.1016/s0761-8425(09)74719-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Martinet Y, Wirth N, Clément-Duchêne C, Bohadana A, Spinosa A. L’exposition passive à la fumée du tabac aggrave les BPCO et la suppression de cette exposition améliore les symptoms fonctionnels respiratoires. Rev Mal Respir 2007. [DOI: 10.1016/s0761-8425(07)91647-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Martinet Y, Wirth N, Clément-Duchêne C, Bohadana A, Spinosa A. Aux États-Unis, la réduction du tabagisme s’est traduite par une diminution de la mortalité globale par cancer et surtout de celle par cancer bronchique. Rev Mal Respir 2007. [DOI: 10.1016/s0761-8425(07)91650-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Martinet Y, Wirth N, Clément-Duchêne C, Bohadana A, Spinosa A. Varenicline : une nouvelle molécule dans le traitement de la dépendance au tabac. Rev Mal Respir 2007. [DOI: 10.1016/s0761-8425(07)91649-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Martinet Y, Wirth N, Clément-Duchêne C, Bohadana A, Spinosa A. La consommation de tabac oral suédois (snus) est associée à une réduction du risque de devenir fumeur et à une augmentation des chances d’arrêter de fumer en Suède. Rev Mal Respir 2007. [DOI: 10.1016/s0761-8425(07)91646-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Martinet Y, Wirth N, Clément-Duchêne C, Bohadana A, Spinosa A. Cigarettes, pipes, cigares, shishas, bidis... différentes formes du tabac qui sont dangereuses. Rev Mal Respir 2007. [DOI: 10.1016/s0761-8425(07)91648-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Martinet Y, Wirth N, Clément-Duchêne C, Bohadana A, Spinosa A. Tabagisme et risque d’infarctus du myocarde dans 52 pays : étude cas-témoins INTERHEART. Rev Mal Respir 2007. [DOI: 10.1016/s0761-8425(07)91651-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Martinet Y, Bohadana A, Wirth N, Spinosa A, Béguinot E. [Risk reduction strategies in smoking]. Rev Mal Respir 2006; 23:13S109-18; quiz 13S158, 13S159. [PMID: 17057636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
INTRODUCTION Around the world, due to its high efficiency in delivering nicotine, cigarette is, by far, the first device used to consume tobacco. But, as far as health is concerned, cigarette is the worst nicotine delivery system and cleaner delivery systems would be welcome. In respect to tobacco smoking, up to now, most doctors have supported the "quit smoking or die" dogma. However, some smokers cannot or do not want to completely give up the consumption of nicotine. BACKGROUND Indeed, while some smokers can stop smoking and, for some of them, simply switch to a nicotine replacement therapy (NRT), other smokers crave the acute effects associated with the rapid massive surge of nicotine delivered to the brain by tobacco smoke. Currently, this rapid nicotine "high" is mainly experienced by smoking cigarettes, thus explaining the high rate of smoking relapse. VIEWPOINT Thus, for smokers who cannot totally give up nicotine, it is sound to evaluate the rationale for the use of tobacco products with possible lower toxicity than cigarette smoke. CONCLUSIONS Unfortunately, this important question triggers off passionate statements, while scientific and experimental observations are still very tenuous. Furthermore, the tobacco companies, by producing new tobacco products and promoting the use of smokeless tobacco such as snus, put a constant pressure on the Public Health community.
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Affiliation(s)
- Y Martinet
- Unité de Coordination de Tabacologie, CHU de Nancy, France.
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Martinet Y, Wirth N, Bohadana A, Spinosa A. La consommation de cannabis peut s’accompagner de complications respiratoires identiques à celles liées à la consommation de tabac. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72938-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Martinet Y, Wirth N, Bohadana A, Spinosa A. Les fumeurs de cigarettes meurent en moyenne 10 ans plus jeunes que les non-fumeurs. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72935-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Martinet Y, Wirth N, Bohadana A, Spinosa A. Grossesse et tabac : bilan et perspectives pour une amélioration de la prévention et de la prise en charge. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72939-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Martinet Y, Wirth N, Bohadana A, Spinosa A. De nouveaux traitements de la dépendance nicotinique vont bientôt être disponibles. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72940-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Martinet Y, Wirth N, Bohadana A, Spinosa A. La France a ratifié la convention-cadre de l’OMS pour la lutte anti-tabac (CCLAT) le 19 Octobre 2004. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72942-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Martinet Y, Wirth N, Bohadana A, Spinosa A. L’Irlande est à la pointe dans la lutte contre le tabagisme. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72941-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Martinet Y, Wirth N, Bohadana A, Spinosa A. La consommation de tabac à usage oral et à faibles taux de nitrosamines réduit de 90 % les risques sanitaires par rapport à celle de tabac sous forme de cigarettes. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72936-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Martinet Y, Wirth N, Bohadana A, Spinosa A. Pour un non-fumeur, vivre avec un fumeur augmente d’environ 15 % la mortalité. Rev Mal Respir 2005. [DOI: 10.1016/s0761-8425(05)72937-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Abstract
INTRODUCTION Environmental tobacco smoke is a recognized factor of morbidity and mortality. The first victims are children, sometimes starting from conception, but adults are not spared. In practice, evaluation of exposure to tobacco smoke can be achieved with more or less specific markers of tobacco smoke. CURRENT KNOWLEDGE Exposure of the fetus to maternal smoking and of the infant to environmental smoke can have a serious sometimes life-threatening impact. Such exposure increases the risk of spontaneous abortion, ectopic pregnancy, intrauterine growth retardation, premature membrane rupture, preterm birth, retroplacental hematoma, placenta praevia, and sudden infant death. Adult respiratory and cardiovascular disease are also influenced by environmental smoke. In France passive smoking causes premature death of 3000 persons per year. PERSPECTIVES Better knowledge of the risks of exposure to passive smoking can facilitate application of legislation with the objective of protecting non-smokers. CONCLUSIONS Rigorous application of current legislation is important to achieve the stated goals of prevention of smoking as well as assistance to cease smoking.
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Affiliation(s)
- N Wirth
- Service de Pneumologie, Unité de Tabacologie, Hôpital de Brabois, Centre Hospitalier Universitaire de Nancy, allée du Morvan, 54511 Vandoeuvre-lès-Nancy Cedex.
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Affiliation(s)
- N Wirth
- Service de Pneumologie, Unité de Tabacologie, Hôpital de Brabois, CHU de Nancy-Vandoeuvre-les-Nancy, France.
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Abstract
Studies over the past few decades have showed a clear association between cigarette smoking and the development of chronic airway obstruction. Yet, only a minority of smokers is affected so that in many, even heavy, smokers, pulmonary function remains within normal limits. While carcinogens have been well characterized, there is only limited information about the constituents of cigarette smoke responsible for inducing chronic airway obstruction. In addition, the associated risks factors for airway obstruction in smokers have not been totally identified. The present paper is a review of the recently accumulated facts concerning the intimate action of cigarette smoke at the level of large and small airways and lung parenchyma. The role of classical inflammatory cells such as neutrophils and alveolar macrophages is reviewed, but emphasis is put on recent evidence indicating the involvement of CD8 + T-lymphocytes and possibly eosinophils in the genesis of the structural changes leading to airways obstruction. The mechanisms by which airway inflammation and remodelling cause airway narrowing and airflow limitation are discussed, along with the associated loss of lung elasticity secondary to destructive emphysema. Other biological, epidemiological, physiopathological, and clinical aspects are analyzed, stressing such fundamental aspects as the defence mechanisms, the morpho-functional correlations, the identification of susceptible smokers, and the early detection of airway obstruction, both in specialized laboratories and in primary care.
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Affiliation(s)
- A Bohadana
- INSERM Unité 420, Epidémiologie Santé Travail, Faculté de Médecine, 9 av de la Forèt de Haye, B.P 184, Vandoeuvre-lès-Nancy 54505, France.
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Bohadana A, Nilsson F, Rasmussen T, Martinet Y. Nicotine inhaler and nicotine patch as a combination therapy for smoking cessation: a randomized, double-blind, placebo-controlled trial. Arch Intern Med 2000; 160:3128-34. [PMID: 11074742 DOI: 10.1001/archinte.160.20.3128] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND Nicotine replacement therapy is an effective treatment for nicotine-dependent smokers. However, cessation rates are modest, and preliminary studies suggest that combination therapy may be superior. We compared the efficacy of the nicotine inhaler plus nicotine patch vs nicotine inhaler plus placebo patch for smoking cessation. METHODS A double-blind, randomized, placebo-controlled trial was conducted in 400 subjects who had smoked 10 or more cigarettes per day for 3 years or longer. Group 1 (n = 200) received the nicotine inhaler plus nicotine patch (delivering 15 mg of nicotine per 16 hours) for 6 weeks, then inhaler plus placebo patch for 6 weeks, then inhaler alone for 14 weeks. Group 2 (n = 200) received the nicotine inhaler plus placebo patch for 12 weeks, then inhaler for 14 weeks. Inhaler was used at a rate of 6 to 12 cartridges per day ad libitum for 3 months and then tapered off. Main outcome measures were complete abstinence (self-reported) and expired carbon dioxide concentration less than 10 ppm. RESULTS Group 1 vs group 2 complete abstinence rates were 60.5% and 47.5% at 6 weeks (P =.009), 42.0% and 31.0% at 12 weeks (P =.02), 25.0% and 22.5% at 6 months (P =.56), and 19.5% and 14.0% at 12 months (P =. 14). One-year survival analysis showed a significant association between abstinence and treatment with nicotine inhaler plus nicotine patch (P =.04). Mean nicotine substitution at week 6 was 60.1% (group 1) and 24.6% (group 2) (P<.001). At 12 months, the frequency of respiratory symptoms in abstinent subjects fell significantly and lung function showed a trend toward improvement. The most common adverse events were throat irritation (inhaler) and itching (patch). CONCLUSIONS Treatment with the nicotine inhaler plus nicotine patch resulted in significantly higher cessation rates than inhaler plus placebo patch.
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Affiliation(s)
- A Bohadana
- INSERM Unité 420, Epidémiologie Santé Travail, Faculté de Médecine, BP 184-54505 Vandoeuvre-Cedex, France.
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Abstract
The appearance of wheezes and changes in inspiratory breath (vesicular) sound intensity (BSI) were monitored in patients undergoing routine methacholine challenge test (MCT). The results were compared with changes in spirometry and to airway hyper-responsiveness (AH). Fifty-four patients were examined. Spirometry was performed before and after the inhalation of cumulative doses of methacholine starting from 25 micrograms; a fall in forced expiratory volume in 1 s (FEV1) by 20% or more was considered as significant. Lung auscultation was performed by two observers simultaneously using a special stethoscope placed sequentially over the posterior right and left upper (interscapular region, 5 cm from the fourth thoracic vertebra) and lower lung zones (5 cm below the scapulae). Symptoms were recorded by the patients on a visual analogue scale. In 27 patients, the MCT was positive (MCT+) and in 27 patients it was negative (MCT-). Wheezes were identified at PD20 in 12 MCT+ patients while reduced BSI alone was found in 11 patients; in four patients, auscultation was normal. In 20 MCT+ patients, either wheezes, diminished BSI or both were heard, one to several steps before reaching PD20. In the MCT- group, wheezes were detected in two patients and diminished BSI in four. In MCT+ patients, the mean (+/-SD) perception of symptoms at end-challenge was 33% (+/-26), whereas in MCT- patients, it was 13.6% (+/-22). Complete inter-observer agreement was found in 95.7% of auscultations performed (Kappa coefficient = 0.846). Coupled to spirometry, lung auscultation may prove useful in airway challenge testing provided the concept is accepted that wheeze appearance and, by extension, an acute decrease in BSI, is as legitimate a manifestation of AH as a fall in FEV1.
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Affiliation(s)
- A Purohit
- Service de Pneumologie, Hôpital Civil, Hôpitaux Universitaires, Strasbourg, France
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Pham QT, Bourgkard E, Chau N, Willim G, Megherbi SE, Teculescu D, Bohadana A, Bertrand JP. Forced oscillation technique (FOT): a new tool for epidemiology of occupational lung diseases? Eur Respir J 1995; 8:1307-13. [PMID: 7489795 DOI: 10.1183/09031936.95.08081307] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The aim of this study was to evaluate the usefulness of the forced oscillation technique (FOT) in the assessment of occupation-related airway changes. The forced oscillation technique and conventional lung function tests were applied in 80 underground coalface workers, aged 35-48 yrs, with chest roentgenogram films classified 0/1 or 1/0 according to the International Labour Office (ILO) classification (G group), and two control groups matched for age and smoking habits. The first control group, was made up of face-workers having normal chest radiographs, whilst the second comprised underground non-face-workers with normal chest radiographs. Spirometric, plethysmographic and transfer factor of the lungs for carbon monoxide single-breath (TL,CO,sb) indices revealed no significant differences between the three groups. As regards the forced oscillation technique, a higher value of resistance/frequency slope (Pa.L-1.s2) was found in the G group compared with the control groups; 2.11 vs 1.06 in the face-workers, and 1.58 in the underground workers. In all three groups, the forced oscillation technique indices (mean resistance (R), resistance at zero frequency (RO), resistance/frequency slope (S), and resonant frequency (fo)) were found to be higher in subjects having a decreased forced expiratory volume in one second (FEV1) (< or = 90% predicted) or a mildly obstructive pattern of ventilatory function, even though this did not reach statistical significance in each of the groups. These findings together with the feasibility and acceptability of the forced oscillation technique would suggest that it may be a suitable tool for epidemiological studies of occupational respiratory diseases.
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Affiliation(s)
- Q T Pham
- INSERM U 420, Faculté de Médecine, Vandoeuvre-lès-Nancy, France
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Abstract
The effects of hypotension induced by trimetaphan on ventilatory control were assessed in sixteen normal subjects under halothane anaesthesia. The breathing pattern, mouth occlusion pressures, lung mechanics, acid-base balance, and arterial blood gases were analysed before and during trimetaphan infusion. During induced hypotension, the only significant change in the ventilatory variables was an increase in the ratio of inspiratory duration to total cycle duration from 0.39 +/- 0.05 (SD) to 0.42 +/- 0.03; P less than 0.01. The average minute ventilation remained unchanged. No modification in lung mechanics was observed, but all subjects developed a slight but significant hypocapnic alkalosis: PaCO2 was reduced from 5.5 +/- 0.4 to 5.2 +/- 0.4 kPa (P less than 0.001) and pH increased from 7.34 to 7.36 (P less than 0.05), without change in standard bicarbonate concentration. Our data indicate that the reduction in sympathetic nervous system activity induced by trimetaphan infusion in spontaneously breathing man causes only a minor alveolar hyperventilation. The weak respiratory response to hypotension suggests that changing peripheral afferent activity has little influence on the typically rapid breathing pattern induced by halothane.
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Peslin R, Jardin P, Bohadana A, Hannhart B. [Harmonic content of the flow signal during forced expiration in normal man (author's transl)]. Bull Eur Physiopathol Respir 1982; 18:491-500. [PMID: 7074245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In order to define the minimal frequency response requirements for spirometric measurements, the harmonic content of forced expiratory flow has been assessed in 63 healthy subjects. The amplitude of the harmonics has been found to decrease almost exponentially with increasing frequency. On the average, the cumulated frequency content beyond 10 Hz represented less than 5% of the total frequency content in men, and less than 3% in women. No significant difference has been observed between male smokers and non-smokers. The harmonic content per unit frequency has been found to be correlated to maximal flows at middle and low lung volumes and to maximal mid-expiratory flow up to 4 Hz. For FEV1, maximal flow at 75% of the vital capacity and, particularly, peak expiratory flow rate (PEFR), the correlations were still significant at quite higher frequencies. The data suggest that, except for PEFR, all these indices may be obtained with a good accuracy when the frequency response of the equipment is flat up to 5-7 Hz.
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Peslin R, Bohadana A, Hannhart B, Jardin P. Comparison of various methods for reading maximal expiratory flow-volume curves. Am Rev Respir Dis 1979; 119:271-7. [PMID: 434599 DOI: 10.1164/arrd.1979.119.2.271] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
To determine the best procedure for reading maximal expiratory flow-volume curves 2 sets of 5 curves were obtained one hour apart in 89 subjects and processed digitally according to 8 different methods. Four indices were considered: the forced expiratory flows at 25, 50, and 75 per cent of the forced vital capacity, and the maximal mid-expiratory flow. When selecting the curve yielding the largest forced vital capacity or the largest sum of forced vital capacity and forced expiratory volume in 1 sec, flow values were significantly lower (P less than 0.001) and were often less reproducible than those obtained with most of the other methods. Computing the mean of the indices among the curves with the 2 largest forced vital capacities also provided comparatively low values, but with with better reproducibility. In contrast, maximal flows were probably overestimated by using the highest values among the curves having forced vital capacity or a surface area within 5 per cent of the largest, or when reading the indices on a composite curve obtained by superimposing individual breaths at residual volume. More reproducible and, probably, unbiased data may be drawn from the composite curves obtained by superimposing the breaths either at total lung capacity or on the descending limb.
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Hannhart B, Peslin R, Bohadana A, Teculescu D. [Ventilatory limitations during exercise in patients with chronic obstructive lung disease (author's transl)]. Bull Eur Physiopathol Respir 1979; 15:75-89. [PMID: 465824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Abstract
A rare case of primary diffuse amyloidosis of the lung with an abnormal monoclonal protein is described. The diagnosis was confirmed by an open-lung biopsy. The different classifications of amyloidosis as well as the relationship between the immunoglobulins and the pathogenesis of amyloid disease is discussed.
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