Clinical Trial of Acid Reflux Therapy in Asthma

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DESCRIPTION (provided by applicant): Gastroesophageal reflux (GERD) is frequent in asthmatics with poor asthma control, often occurs without symptoms, and can induce bronchoconstriction. Poorly controlled asthmatics are often treated for GERD with drugs that suppress gastric acid, but this treatment is expensive and the benefit of such treatment is not established. The objective of this proposal is to conduct a multi-site randomized clinical trial testing the hypotheses that treatment of GERD with proton-pump inhibitors will reduce the frequency of exacerbations in patients with inadequately controlled asthma. The proposed trial will enroll 400 asthmatics, ages 18-60, who have poor asthma control on inhaled steroids, defined on the basis of excessive bronchodilator use, nocturnal awakenings, or frequent exacerbations. Participants will be randomly assigned to treatment with either a proton pump inhibitor, esomeprazole (Nexium) 40 mg BID, or matching placebo. The presence, severity, and temporal relationship of GERD to asthma symptoms will be documented with 24 hour ambulatory esophageal pH probe monitoring, but participants will be enrolled irrespective of the severity of GERD. The primary outcome measure is the proportion of participants who have exacerbations of asthma within a 6-month period defined by asthma diaries and interviews. Secondary outcome measures include asthma symptom and control scores, asthma-specific and generic health-related quality of life, GERD symptoms, health care use, pulmonary function, and airways reactivity. Pre-specified subgroup analyses will be conducted to determine if there are clinical or demographic characteristics that predict benefit from treatment of GERD in asthma.