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At least 19 recordsLinked to original sources
PubMed1978

[Drug prevention of bronchial asthma: inhibition of histamine and exercise-induced asthma by a new anti-anaphylactic oral preparation (ketotifen) (author's transl)].

The protective anti-asthmatic effect of a new anti-allergic drug with histaminolytic and anti-anaphylactic properties was tested in various controlled clinical studies of induced bronchospasm in asthmatic patients (provocation tests using a histamine aerosol, and exercise-induced asthma using a bicycle ergometer). The drug, ketotifen (a cycloheptathiophene derivative) was compared with a classical antihistaminic (clemastine) and a known cell stabiliser (disodium cromoglycate). In both models ketotifen provided significant protection.

Adult↗
PubMed1976

Salmefamol and Salbutamol in exercise-induced asthma in children.

A double-blind controlled study is reported of salmefamol 200 mug and salbutamol 200 mug administered by aerosol before exercise tests in asthmatic children. Both drugs prevented exercise-induced asthma. There was no significant difference between them.

Adolescent↗
PubMed1975

[Exercise test in the asthmatic patient. Study of 75 patients].

Frequency of exercise-induced asthma has been studied in 75 unselected asthmatic patients (adults and children) by measuring the forced expiratory volume at one second (FEV1) and the vital capacity (VC) before and after a treadmill exercise, continued until heart rate was at least equal to 80 p.cent-85 p.cent of maximum heart rate. In 19 subjects (25 p.cent), a more than 20 p.cent decrease from control value of FEV1 was recorded ten minutes after exercise ended. Exercise-induced bronchial obstruction was relieved by a beta adrenergic bronchodilator aerosol inhalation. In the group of 19 subjects having exercise-induced asthma, a significant positive correlation was found between pre-exercise FEV1 values and post-exercise FEV1 decreases. In the whole group of 75 subjects exercise-induced asthma was related to the severity of asthma and not to other clinical or physical characteristics of the subjects. From the data of other authors it appears that frequency of exercise-induced asthma is variable. The reasons of those differences are discussed.

Adolescent↗
PubMed1977

Comparison of arm versus leg work in induction of acute episodes of asthma.

The severity of exercise-induced asthma varies with the type of exercise performed. To determine whether such variation could be attributed to the use of different muscle groups, we exercised arms separately from legs using a bicycle ergometer. First, arms were exercised to exhaustion, then legs were exercised at the same load for the same duration. Arm work resulted in greater ventilation, heart rate, hydrogen ion concentration, and airway obstruction than did leg work. Later, legs were exercised to exhaustion using a load more than twice that of the arm work. Both the exhausting leg work and exhausting arm work resulted in significant bronchospasm and acidosis, whereas the nonexhausting leg work did not. These data suggest that, in arm and/or leg exercise, the relationship of work load to muscle mass is a determinant of airway obstruction.

Adult↗
PubMed1979

Effects of oral H1 and H2 receptor antagonists in asthma.

1 There is evidence that H2 receptors are present in the lung, both on bronchial smooth muscle and mast cells. In animal studies, stimulation of H2 receptors causes a diminution, and conversely H2 receptor blockade can increase, smooth muscle contraction and mediator release. 2 The effects of H2 receptor blockade in ten patients with asthma has been studied using oral cimetidine in a dose of 1 g daily for 1 week. Treatment was compared with placebo and the H1 receptor antagonist chlorpheniramine. 3 There was no alteration in the severity of naturally-occurring or exercise-induced asthma with cimetidine or chlorpheniramine. 4 H2 receptor blockade with oral cimetidine in conventional doses is without ill effect in asthma. The use of larger parenteral doses is discussed.

Adolescent↗
PubMed1978

A comparison of rimiterol and salbutamol by inhalation at high and low dose in asthmatic patients.

Rimiterol hydrobromide (Pulmadil) has been shown to have a dose-related bronchodilator effect; the optimum dose by inhalation appears to lie between 200 and 1,000 microgram. When given to a group of asthmatic patients at 'recommended' and 5--10 times 'recommended' dose by aerosol, cardiovascular effects were minimal and of a magnitude similar to that of salbutamol given in the same dosages to the same patients. The very rapid bronchodilator effect of rimiterol would appear to make the drug particularly suitable for the treatment of patients with intermittent asthmatic attacks, before exercise in patients with exercise-induced asthma and for bronchodilatation before using inhaled sodium cromoglycate or corticosteroid aerosols.

Aerosols↗
PubMed1977

Exercise-induced bronchoconstriction in patients with bronchial asthma. Its prevention with an antihistaminic agent.

14 asthmatic patients developing regularly exercise-induced bronchoconstriction were subjected to a submaximal exercise on a bicycle ergometer. On the first day the exercise was not preceded by any medication; on the second, 50 mg thiazinamium was given, and on the third day 2 mg atropine was given before the exercise. The changes in the calibre of the bronchi were assessed with a Wright peak flow meter. With thiazinamium a complete protection against the bronchoconstriction was observed in 12 patients, in one the protection was partial and in an other no beneficial effect of the drug was found. It seems that protection given by thiazinamium was due to its antihistaminic property and not to the anticholinergic one, as among 10 patients protected by thiazinamium, only 2 were also protected by the atropine.

Adult↗
PubMed2024

Long-term PM2.5 exposure is associated with asthma prevalence and exhaled nitric oxide levels in children.

BACKGROUND: Exhaled nitric oxide concentration (FENO) is a marker of airway inflammation. This study aimed to evaluate the association of air pollution exposure with FENO levels and asthma prevalence with respiratory symptoms in school children. METHODS: We analyzed 4736 school children who reside in six townships near industrial areas in central Taiwan. We evaluated asthmatic symptoms, FENO, and conducted the environmental questionnaire. The personal exposure of PM2.5, NO, and SO2 was estimated using land-use regression models data on children's school and home addresses. RESULTS: Annual exposure to PM2.5 was associated with increased odds of physician-diagnosed asthma (OR&#x2009;=&#x2009;1.595), exercise-induced wheezing (OR&#x2009;=&#x2009;1.726), itchy eyes (OR&#x2009;=&#x2009;1.417), and current nasal problems (OR&#x2009;=&#x2009;1.334) (P&#x2009;<&#x2009;0.05). FENO levels in the absence of infection were positively correlated with age, previous wheezing, allergic rhinitis, atopic eczema, near the road, and for children with high exposure to PM2.5 (P&#x2009;<&#x2009;0.05). An increase of 1 &#x3bc;g/m3 PM2.5 exposure was significantly associated with a 1.0% increase in FENO levels for children after adjusting for potential confounding variables, including exposures to NO and SO2. CONCLUSIONS: Long-term exposures to PM2.5 posed a significant risk of asthma prevalence and airway inflammation in a community-based population of children. IMPACT: Annual exposure to PM2.5 was associated with increased odds of physician-diagnosed asthma and nasal problems and itchy eyes. Long-term exposures to PM2.5 were significantly associated with FENO levels after adjusting for potential confounding variables. This is first study to assess the association between FENO levels and long-term air pollution exposures in children near coal-based power plants. An increase of 1 &#x3bc;g/m3 annual PM2.5 exposure was significantly associated with a 1.0% increase in FENO levels. Long-term exposures to PM2.5 posed a significant risk of asthma prevalence and airway inflammation in a community-based population of children.

Humans↗
PubMed1976

Parasites and asthma in Tanzanian children.

It has been claimed that parasitic infestation suppresses the development of asthma. Eight Tanzanian schoolchildren in whom asthma was confirmed by the demonstration of exercise-induced bronchospasm were found in an ascaris-endemic area of rural Tanzania. Faecal parasites were found equally commonly in the children with asthma and the ninety-seven non-asthmatic controls. The prevalence of asthma (3.3%) in the school under study was comparable with that found in developed countries.

Adolescent↗