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Asthma: a major pediatric health issue
1University of Liverpool, Institute of Child Health, Alder Hey Children's Hospital, Liverpool L12 2AP, UK. r.l.smyth@liv.ac.uk
Insights
Childhood asthma rates have risen globally over recent decades, especially in preschoolers, with significant international variations. Current research explores environmental, genetic, and lifestyle factors to understand these concerning asthma trends.
Area of Science:
- Pediatric respiratory health
- Epidemiology of childhood diseases
Background:
- Childhood asthma incidence, prevalence, and mortality show a concerning upward trend over the past 3-4 decades.
- These trends are most pronounced in preschool-aged children, highlighting a critical public health concern.
- Significant international disparities in asthma rates exist, as evidenced by the International Study of Asthma and Allergies in Childhood.
Purpose of the Study:
- To summarize global trends in childhood asthma.
- To identify geographical variations in asthma rates.
- To explore potential contributing factors to the rise in childhood asthma.
Main Methods:
- Analysis of epidemiological data on childhood asthma trends.
- Review of international asthma studies, including the International Study of Asthma and Allergies in Childhood.
- Synthesis of current hypotheses regarding asthma risk factors.
Main Results:
- Asthma rates have generally increased globally in children over the last 3-4 decades, with a recent slight decline.
- Highest asthma rates are observed in English-speaking countries and some Latin American nations.
- Lowest rates are reported in countries like South Korea, Russia, and Indonesia.
- No single unifying hypothesis explains the observed trends or risk factors.
Conclusions:
- The etiology of childhood asthma remains complex, with no single unifying hypothesis.
- Potential causative factors include environmental influences (e.g., air pollution), genetic predispositions, the hygiene hypothesis, and lifestyle differences.
- Asthma development may involve persistent immune system activation and airway remodeling in early childhood.
- Further research is necessary to elucidate the precise mechanisms and confirm hypotheses.
Abstract:
The incidence, prevalence, and mortality of asthma have increased in children over the past three to four decades, although there has been some decline in the most recent decade. These trends are particularly marked and of greatest concern in preschool children. Internationally, there are huge variations among countries and continents, as demonstrated by the International Study of Asthma and Allergies in Childhood. In general, asthma rates were highest in English-speaking countries (UK, New Zealand, Australia, and North America) and some Latin American countries (Peru and Costa Rica), and lowest in South Korea, Russia, Uzbekistan, Indonesia, and Albania. There is currently no unifying hypothesis to explain these trends or any associated risk factors. Environmental factors that may lead to asthma include air pollution; genetic factors, the hygiene hypothesis, and lifestyle differences also play potentially causative roles. Asthma may develop as a result of persistent activation of the immune system alone or in combination with physiologic airway remodeling in early childhood. Further studies are needed to confirm this hypothesis.