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Childhood asthma
N M Clark1, R W Brown, E Parker
1University of Michigan School of Public Health Department of Health, Behavior and Health Education, Ann Arbor 48109-2029, USA. nmclark@umich.edu
Insights
Childhood asthma is rising, disproportionately affecting minority groups. While indoor allergen control helps, outdoor air pollution can worsen symptoms in children with asthma.
Area of Science:
- Pediatric respiratory health
- Environmental medicine
- Epidemiology
Background:
- Childhood asthma prevalence has surged by 58% since 1980, with mortality increasing by 78%.
- The disease disproportionately impacts urban and racial/ethnic minority populations, showing higher hospitalization and morbidity rates.
- Asthma is characterized by airway inflammation, linked to IgE production against common environmental allergens.
Purpose of the Study:
- To review the current understanding of asthma triggers in children.
- To assess the effectiveness of interventions targeting indoor allergens.
- To examine the relationship between outdoor air quality and childhood asthma.
Main Methods:
- Literature review of recent research on asthma prevalence, triggers, and interventions.
- Analysis of epidemiological data on asthma trends and demographic disparities.
- Examination of studies on the impact of indoor and outdoor environmental factors on asthma symptoms.
Main Results:
- Interventions reducing dust mite and animal dander exposure show positive results for symptom control.
- Evidence linking outdoor air pollution to asthma prevalence is limited, but air quality exacerbates existing asthma symptoms.
- Decreased pulmonary function and bronchial hyperresponsiveness are associated with exposure to particulates, smoke, sulfur dioxide (SO2), and nitrogen dioxide (NO2).
Conclusions:
- Effective asthma control requires a multi-faceted approach, including patient, family, and professional collaboration.
- Community-wide environmental controls and supportive policies are crucial for managing childhood asthma.
- Further research is needed on interventions for cockroach antigen exposure and outdoor environmental factors.
Abstract:
Asthma prevalence in children has increased 58% since 1980. Mortality has increased by 78%. The burden of the disease is most acute in urban areas and racial/ethnic minority populations. Hospitalization and morbidity rates for nonwhites are more than twice those for whites. Asthma is characterized by recurrent wheezing, breathlessness, chest tightness, and coughing. Research in the past decade has revealed the importance of inflammation of the airways in asthma and clinical treatment to reduce chronic inflammation. Asthma is associated with production of IgE to common environmental allergens including house dust mite, animal dander, cockroach, fungal spores, and pollens. Some interventions to reduce symptoms through control of dust mite and animal dander have had positive results. Control of symptoms through interventions to reduce exposures to cockroach antigen has not been reported. Studies illustrating causal effects between outdoor air pollution and asthma prevalence are scant. Increases in asthma prevalence have occurred at the same time as general improvements in air quality. However, air quality appears to exacerbate symptoms in the child who already has the disease. Decreased pulmonary function has been associated with exposure to particulates and bronchial hyperresponsiveness to smoke, SO(2) and NO(2). Symptoms have been correlated with increased levels of respirable particulates, ozone, and SO(2). Interventions that reduce the negative outcomes in asthma associated with outdoor environmental factors have not been reported. Control of asthma in children will entail the collaborative efforts of patients, family, clinical professionals, and school personnel, as well as community-wide environmental control measures and conducive national and local policies based on sound research.