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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
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Asthma I: Introduction01:28

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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
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Asthma presents with a characteristic pattern of episodic respiratory symptoms that reflect underlying airway inflammation, bronchoconstriction, and mucus hypersecretion. Although severity varies among individuals, certain clinical manifestations are considered hallmarks of the disorder and often guide diagnosis and assessment.Respiratory SymptomsA persistent cough is one of the most common early features of asthma. It is frequently dry and tends to worsen at night or in the early morning,...
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Vitamins C and E for asthma and exercise-induced bronchoconstriction.

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Area of Science:

  • Respiratory Medicine
  • Nutritional Science
  • Clinical Trials

Background:

  • The role of dietary antioxidants like vitamin C and vitamin E in managing asthma and exercise-induced bronchoconstriction (EIB) remains unclear.
  • Inadequate vitamin E intake is linked to airway inflammation, suggesting a potential benefit of supplementation.
  • It is hypothesized that combining vitamins C and E may offer greater advantages than individual supplementation for asthma and EIB.

Purpose of the Study:

  • To evaluate the impact of vitamin C and E supplementation versus placebo on asthma exacerbations and health-related quality of life (HRQL) in adults and children.
  • To investigate the effects of vitamin C and E on exercise-induced bronchoconstriction in individuals with and without asthma.

Main Methods:

  • Systematic review of randomized controlled trials identified through specialized databases and registries up to September 2013.
  • Included trials involved adults and children with asthma or exercise-induced bronchoconstriction, comparing vitamin C and E supplementation against a placebo.
  • Studies with similar background asthma management in both treatment and control groups were selected; short-term use during exacerbations was excluded.

Main Results:

  • Five trials with 214 participants were included, but data could not be aggregated due to heterogeneity.
  • No studies reported on the primary outcomes of exacerbations or HRQL.
  • Lung function data were inconclusive, with only a potential moderate/low quality suggestion of effect in a pediatric study and a small exercise-induced asthma trial.

Conclusions:

  • Firm conclusions regarding the efficacy of vitamin C and E supplementation for asthma or EIB cannot be drawn due to limited and inconclusive evidence.
  • The reviewed studies primarily focused on the impact of pollutants rather than clinical outcomes like HRQL and exacerbations.
  • Further high-quality research is required to establish the role of vitamin C and E supplementation in managing asthma and exercise-induced breathlessness.