Risk factors for severity of childhood bronchial asthma

ABSTRACT

Bronchial asthma is the most common chronic illness of childhood and despite advances in therapy, asthma prevalence, morbidity and mortality are all increasing in many places. The objective of present study was to assess potential risk factors for severity of bronchial asthma among children 2-10 years of age. The study was a case-control age matched carried out at Bab El-Sha' reya University Hospital for one year. The inclusion criteria included any child 2- 10 years of age with episodes of wheezing in the last 3 months that responded to bronchodilators. The severity of asthma was classified according to National Asthma Education and Prevention Program [NAEPP]. Patients with mild intermittent bronchial asthma were considered as controls [n=100] while patients with moderate or severe asthma were considered as cases [n=100]. Exclusion criteria were congenital heart diseases, chronic chest conditions and history of admission to neonatal intensive care unit. All enrolled patients were interviewed by special questionnaire which included all potential risk factors and were subjected to the following investigations chest X-ray PA, CBC, total and differential leucocytic count, hemoglobin level and serum immunoglobulin IgE. Residence in urban area, male gender, crowding index >= 4 persons room, low birth weight and passive smoking >10 cigarette/day were risk factors for severity of asthma [Odds ratio 3.3, 2.1, 1.6, 1.5, 1.3 respectively]. After controlling for different confounders, they were still risk factors for severity of asthma. Serum IgE, absolute eosinophil count, percentage of cases with higher serum IgE than normal level and hyper-inflated lung in X-ray were higher among cases than controls but the difference was not statistically significant. We recommended a large scale cohort studies of children to evaluate the relative risk of potential risk factors for severity of bronchial asthma