Outcome of a randomized multifaceted intervention with low-income families of wheezing infants

Abstract

Objective: To evaluate the outcome of a secondary intervention conducted with infants at risk for asthma.

Design: Families of wheezing infants were randomized to a 1-year intervention or control group; outcome evaluation occurred from April 1, 2000, through September 30, 2003, when children reached 4 years of age.

Setting: Home intervention and clinic evaluation.

Participants: A total of 149 children from low-income urban families with multiple wheezing episodes before the age of 2 years.

Intervention: Nurse home visitors provided a multifaceted intervention (environmental allergen and tobacco smoke reduction as well as illness management) that lasted 12 months, with the goal of decreasing asthma onset and/or severity when children reached 4 years of age.

Main outcome measures: Asthma status (parent-reported symptoms, impulse oscillometry, and documented asthma diagnosis), caregiver quality of life, medication use, and emergency department visits.

Results: A total of 46.0% of children from the intervention group and 54.9% from the control group met criteria for asthma at the age of 4 years (P = .33). Caregiver quality of life was better for the intervention group (P = .01). Children in the intervention group were less likely to have reactive airways (prebronchodilator-postbronchodilator decrease in impulse oscillometry resistance at 10 Hz of > or =15%; P = .07). Outcome was modified by baseline illness severity; among children with low severity, odds of developing asthma by the age of 4 years were 3 times lower for intervention children than controls (P = .04), and symptom severity was lower for intervention children (P = .03).

Conclusions: Multifaceted intervention did not decrease asthma among children with early wheezing illness as a whole, but only for children with low illness severity in infancy. Despite having an impact on only less severely ill children, results demonstrate the possibility of ameliorating illness burden for some inner-city families with children at high risk for poor asthma outcomes.