<qa>  What is the mainstay of treatment for persistent asthma?Background: Asthma prevalence, emergency visits, and hospitalizations have increased substantially, especially among young children and urban populations. Although inhaled corticosteroids ICS are the mainstay of treatment for persistent asthma, studies have demonstrated a low rate of ICS usage and primary care provider follow-up within a month of an Emergency Department ED visit. Furthermore, ICS usage and adherence with National Asthma Education and Prevention Program NAEPP recommendations is low even for children that follow-up with their primary care physician PCP. In addition, other studies have demonstrated frequent symptoms, activity restriction, and missed school or work during the weeks following an ED visit. Prescribing ICS at ED discharge occurs uncommonly in the United States based on surveys and reviews of current practice. Adult studies have been inconclusive and the role of ICS after a pediatric emergency visit for asthma has not been studied. This study will assess the short-term outcomes of prescribing ICS to young children with persistent asthma symptoms after an emergency visit for asthma. 