Environmental Control as Add-on Therapy in Childhood Asthma

The study is a parallel arm study of an individually tailored, multi-faceted ECS plus controller medication titration versus controller medication titration alone. After a 4-week run-in period to stabilize the asthma, the investigators will randomize 200 Baltimore children with persistent asthma and a recent exacerbation in a 1:1 ratio to the two arms and follow the children for six months. There will be five clinic visits and three home visits over this time period for clinical and home assessments, respectively. There will be up to four environmental intervention visits for participants randomized to the environmental control plus controller medication group. The environmental modules include mouse, cockroach, furry pets, dust mites, and smoking. Air purifiers and laundered bedding are also included in this arm. Participants randomized to the controller medication group have the option of having one home visit after completing the study at which the participants will receive home intervention services that the environmental control plus controller medication group received. Participants will have repeated assessment of: controller medication requirements; secondary clinical, physiologic, and inflammatory outcomes; and particulate matter (PM), air nicotine, and allergen levels.

Inclusion criteria

• Have physician-diagnosed asthma at least 1 year prior to the baseline visit, or asthma symptoms for at least 1 year
• Meet criteria for current persistent asthma defined as either:

• On a long-term controller medication for asthma, or
• Meet National Asthma Education and Prevention Program (NAEPP) guideline requirements for persistent disease:(46)
• Asthma symptoms 3 or more days per week over the past 2 weeks or
• Nocturnal asthma symptoms at least 3 times in the past month
• Have evidence of uncontrolled disease as defined by at least one of the following:

• One asthma-related unscheduled visit to an emergency department (ED), clinic or urgent care facility in the previous 12 mo
• One asthma-related overnight hospitalization in the previous 12 mo
• One or more bursts of oral corticosteroids in the previous 12 mo
• Reside within a geographic area of the study site so that home visits are feasible.
• Have no plans to move within the upcoming 6 months
• Have insurance to cover prescription medications.
• Have a positive skin test (net wheal ≥2mm) to cat, dog, mouse, cockroach, or dust mites or have a positive cat, dog, mouse, German cockroach, or D. farinae-specific immunoglobulin E (IgE) test, as quantified using the ImmunoCAP system (≥0.35 kU/L)

Exclusion criteria

• Lung disease, other than asthma, that requires daily medication
• Cardiovascular disease that requires daily medication, excluding hypertension
• Taking a beta-blocker
• Allergy to dairy
• On Xolair < 5 months
• On immunotherapy and has not reached maintenance dose
• Sleeping in another home 4 or more nights/week
• Active smoker defined as a positive urine screen for high levels of urine cotinine
• Unable to access areas of home necessary to conduct extermination