Chipps, Bradley E.Zeiger, Robert S.Dorenbaum, AlejandroBorish, LarryWenzel, Sally E.Miller, Dave P.Hayden, Mary LouBleecker, Eugene R.Simons, F. Estelle R.Szefler, Stanley J.Weiss, ScottHaselkorn, Tmirah2013-04-232012Chipps, Bradley E., Robert S. Zeiger, Alejandro Dorenbaum, Larry Borish, Sally E. Wenzel, Dave P. Miller, Mary Lou Hayden, et al. 2012. Assessment of asthma control and asthma exacerbations in the epidemiology and natural history of asthma: outcomes and treatment regimens (TENOR) observational cohort. Current Respiratory Care Reports 1(4): 259-269.2161-332Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:10579713Patients with severe or difficult-to-treat asthma account for substantial asthma morbidity, mortality, and healthcare burden despite comprising only a small proportion of the total asthma population. TENOR, a multicenter, observational, prospective cohort study was initiated in 2001. It enrolled 4,756 adults, adolescents and children with severe or difficult-to-treat asthma who were followed semi-annually and annually for three years, enabling insight to be gained into this understudied population. A broad range of demographic, clinical, and patient self-reported assessments were completed during the follow-up period. Here, we present key findings from the TENOR registry in relation to asthma control and exacerbations, including the identification of specific subgroups found to be at particularly high-risk. Identification of the factors and subgroups associated with poor asthma control and increased risk of exacerbations can help physicians design individual asthma management, and improve asthma-related health outcomes for these patients.en-USSevere asthmaDifficult-to-treat asthmaAsthma controlExacerbationJournal Article2013-04-2310.1007/s13665-012-0025-x