There is one clinical trial.
Bronchiolitis is a significant cause of morbidity and hospitalization in children, accounting for approximately 125,000 hospitalizations per year in the U.S. Recently, genetic variations of the β2-adrenergic receptor (β2-AR) have been shown to influence response to β2-AR agonist therapy in children with asthma. We suspect that genetic variations of the β2-AR also affect response to β2-AR agonist therapy in children with bronchiolitis.
The next most common polymorphism of the β2-AR gene, glutamine to glutamic acid at position 27 (Glu27Gln), may be associated with the development of asthma and airway hyperresponsiveness, but these relationships are less clear. --- Glu27Gln ---