Asthma prevalence and severity in low-resource communities

Area of Science:

• Global Health
• Respiratory Medicine
• Epidemiology

Background:

• Asthma prevalence was historically underestimated in low-income nations.
• Recent data suggests increasing asthma rates and severity in low and middle-income countries (LMIC).
• Underprivileged communities in developed nations also face high rates of uncontrolled asthma.

Purpose of the Study:

• To review recent literature on the global burden of asthma.
• To examine asthma prevalence and severity in LMIC and underprivileged populations.
• To assess the impact of environmental and socioeconomic factors on asthma.

Main Methods:

• Narrative review of recent publications.
• Analysis of International Study for Asthma and Allergy in Childhood (ISAAC) phase III data.
• Secondary analysis of World Health Organization (WHO) World Health Survey data.

Main Results:

• While developed countries have higher overall prevalence, asthma symptoms are often more severe in LMIC.
• A U-shaped distribution of asthma symptoms was observed across income levels (low, middle, high).
• Factors like unhygienic conditions, urbanization, and air pollution contribute to increased asthma severity in LMIC. Access to inhaled corticosteroids is feasible and cost-effective.

Conclusions:

• Asthma burden in low-income countries is significant and increasing.
• Underdiagnosis, undertreatment, and environmental factors exacerbate asthma in impoverished populations.
• Effective and affordable asthma management strategies, including controller medications, are available for low-resource settings.