A case-control study of the relation between plasma selenium and asthma in European populations: a GAL2EN project.

BACKGROUND: There is evidence that selenium levels are relatively low in Europe and may be falling. Low levels of selenium or low activity of some of the enzymes dependent on selenium have been associated with asthma. METHODS: The GA(2)LEN network has organized a multicentre case-control study in Europe to assess the relation of plasma selenium to asthma. The network compared 569 cases in 14 European centres with a diagnosis of asthma and reporting asthma symptoms in the last 12 months with 576 controls from the same centres with no diagnosis of asthma and no asthmatic symptoms in the last 12 months. RESULTS: All cases and controls were selected from the same population defined by age and place of residence. Mean plasma selenium concentrations among the controls ranged from 116.3 microg/l in Palermo to 67.7 microg/l in Vienna and 56.1 microg/l among the children in Oslo. Random effects meta-analysis of the results from the centres showed no overall association between asthma and plasma selenium [odds ratio (OR)/10 microg/l increase in plasma selenium: 1.04; 95% confidence interval (CI): 0.89-1.21] though there was a significantly protective effect in Lodz (OR: 0.48; 95% CI: 0.29-0.78) and a marginally significant adverse effect in Amsterdam (OR: 1.68; 95% CI: 0.98-2.90) and Ghent (OR: 1.35; 95% CI: 1.03-1.77). CONCLUSION: This study does not support a role for selenium in protection against asthma, but effect modification and confounding cannot be ruled out.

The relation between paracetamol use and asthma: a GA2LEN European case-control study.

Studies from the UK and USA suggest that frequent use of paracetamol (acetaminophen) may increase the risk of asthma, but data across Europe are lacking. As part of a multicentric case-control study organised by the Global Allergy and Asthma European Network (GA(2)LEN), it was examined whether or not frequent paracetamol use is associated with adult asthma across Europe. The network compared 521 cases with a diagnosis of asthma and reporting of asthma symptoms within the last 12 months with 507 controls with no diagnosis of asthma and no asthmatic symptoms within the last 12 months across 12 European centres. All cases and controls were selected from the same population, defined by age (20-45 yrs) and place of residence. In a random effects meta-analysis, weekly use of paracetamol, compared with less frequent use, was strongly positively associated with asthma after controlling for confounders. There was no evidence for heterogeneity across centres. No association was seen between use of other analgesics and asthma. These data add to the increasing and consistent epidemiological evidence implicating frequent paracetamol use in asthma in diverse populations.

Dyspnoea at rest and at the end of different exercises in patients with near-fatal asthma.

Blunted perception of dyspnoea under resistive loading has been observed in patients with a history of near-fatal asthma (NFA). The perception of dyspnoea at rest and at the end point of various exercises was assessed in such patients. Respiratory function and exercise capacity (6-min walking distance, incremental cycloergometry and inspiratory threshold loading) were assessed in seven NFA and eight non-NFA patients. Dyspnoea (Borg scale) was measured at rest and at the end point of the various exercises. Dyspnoea at rest was significantly lower in NFA patients. Although exercise tolerance was similarly reduced in both the NFA and non-NFA groups, dyspnoea at peak cycle exercise was significantly lower in the former (2.6+/-2 versus 6.1+/-3.8 (Borg scale; mean+/-SD)), who mainly (86%) stopped because of leg discomfort. A similar trend was observed in the 6-min walking distance and inspiratory threshold loading tests. Dyspnoea at peak exercise was the best indicator of the NFA condition, with a sensitivity of 100% and specificity of 63% for a Borg scale score of < or = 6. Perception of dyspnoea is blunted in near-fatal asthma patients at both rest and the end point of various forms of exercise. Dyspnoea at peak exercise is the best indicator of the near-fatal asthma condition.

Disnea y calidad de vida en la enfermedad pulmonar obstructiva crónica / Dyspnea and quality of life in chronic obstructive pulmonary disease

No disponible

Adaptation of the Asthma Quality of Life Questionnaire to a second language preserves its critical properties: the Spanish version.

To test the metric proprieties of the Spanish version of the Juniper Asthma Quality of Life Questionnaire (AQLQ), we studied 116 adult asthmatic patients with a wide range of disease severity (53 patients were recruited from the respiratory outpatient department, 38 from a primary health care centre and 25 were patients admitted into hospital due to acute asthma). The patients were assessed twice, at recruitment and after 2 months. The AQLQ showed a high internal consistency (Cronbach's alpha = 0.78 to 0.96) and a high 2-week reproducibility (ICC = 0.82 to 0.92). Expected significant differences in AQLQ scores were observed according to disease severity as measured by symptoms, medication, use of services and recruitment setting. The cross-sectional and longitudinal correlations between AQLQ and the overall St. George's Respiratory Questionnaire were strong, moderate to strong between AQLQ and dyspnea and weak to moderate between AQLQ and FEV(1). The changes in AQLQ scores were significantly different in patients who either improved or deteriorated from those patients who remained stable (P <.0001 and P <.01, respectively, for the overall AQLQ). We conclude that the Spanish version of the AQLQ is reliable, valid and sensitive to changes.

[Effects of Sjögren's syndrome on pulmonary function impairment in patients with rheumatoid arthritis]. / Influencia del síndrome de Sjögren en la afectación funcional pulmonar de pacientes con artritis reumatoide.

The influence of Sjögren syndrome (SS) on pulmonary function impairment in rheumatoid arthritis (RA) patients has been few studied. The aim of this study was to analyse the pulmonary function impairment in RA patients, and to establish differences between patients associated or not to SS. Pulmonary function of 57 patients, non smokers and without another pulmonary disease, diagnosed of RA were studied. Fourteen (24.6%) were associated to SS, and 43 (75.4%) to RA without SS. Age and time of evolution of disease were similar. Eight patients with associated SS (57.2%), and in 20 (46.5%) without SS showed pulmonary function disorder. Airflow obstruction and DLCO diminution were the most common types of impairment, respectively. The comparison between the types of impairment and the mean values of FEVI, FVC, FEVI/FVC %, FEF 25-75 and DLCO were not statistical different. This results suggest a poor influence on pulmonary function impairment in RA patients with SS.

[The quality-of-life questionnaire with asthma patients: the Spanish version of the Asthma Quality of Life Questionnaire]. / Cuestinario de calidad de vida en pacientes con asma: la versión española del Asthma Quality of Life Questionnaire.

This paper describes the translation to Castilian and adaptation of a quality of life measurement instrument: the Asthma Quality of Life Questionnaire (AQLQ). The AQLQ, developed by Juniper et al, contains 32 items, 5 of which relate to habitual activities that the patient can choose from among a list of 26 possibilities. Answers are given on a scale of 7 points. To adapt this instrument for use in Spain, we subjected it to a process of translation/back translation by bilingual informants. The translated and original versions of each item, activity and answer option were evaluated as being totally equivalent (A), fairly equivalent but with some questionable wording (B), or of questionable equivalence (C). The naturalness and correctness of the Spanish version were also evaluated on a scale of 1 to 10. Three (9%) items and 1 (4%) activity were considered to be of questionable equivalence (C) and 12 (37%) items and 1 activity (4%) were considered to be of type B equivalence. The questionable aspects of types B and C equivalence were discussed in 2 meetings, along with expressions that were equivalent but unnatural or grammatically incorrect; the first meeting involved researchers and translators and the second was held with a group of 6 asthmatics. Consensus was finally obtained for each item and activity included in the second draft. That draft was then administered to another group of 7 patients in order to check comprehension and equivalence, after which a definitive version was produced by the researchers.(ABSTRACT TRUNCATED AT 250 WORDS)

[Indications, performance and complications of bronchofibroscopy in the aged]. / Indicaciones, rendimiento y complicaciones de la broncofibroscopia en el anciano.

Bronchofibroscopy is a widely used exploration for the diagnosis of several pulmonary processes. However, its use in aged patients, these being considered a high risk group, is still a controversial issue. The aim of this study was to analyze the indications, diagnostic performance and complications of the bronchofibroscopy in the elderly and to determine if there are any differences with respect to the adult population. A retrospective case control study was conducted, taking as cases those patients with 70 or more years of age, and as controls, those patients with less than 70 years. The study period was 1 year, with 54 bronchofibroscopies performed in 49 patients from the study group and 149 in 145 patients from the control group. The indications were similar in both groups, except for the study of opportunistic infections, these being more frequent among the control group. Diagnostic performance and complications did not show any differences between both groups. Indications, performance and complications of bronchofibroscopy in aged patients are similar to those in the adult population. Hence, the age in itself should not be a limiting factor for the indication of this exploration.