SJS is seen as a high fever, malaise, and a developing rapidly, blistering exanthema of macular papules and target-like lesions, accompanied by mucosal involvement. This condition is associated with an interest rate of death of approximately 5 percent. TEN includes a similar presentation, with even more extensive pores and skin detachment and a death count of 25 to 35 percent. 3 This association was subsequently confirmed in people from Hong Kong, Malaysia, Thailand, and India and in descendants of immigrants from Southeast Asia, regions in which the HLA-B*1502 allele is certainly prevalent.4-9 Another HLA allele, HLA-A*3101, has been associated with carbamazepine-induced hypersensitivity reactions.This study also shows the specific benefits of linking clinical and administrative databases. Clinical databases are well suited to risk adjustment and the identification of clinically important subgroups but lack details on long-term outcomes. Administrative data sets have limited convenience of clinical considerations, however they provide information on long-term outcomes. Linking scientific data with administrative data capitalizes on advantages of each. There are several limitations of the scholarly study. Despite initiatives by the ACCF and STS to provide coordinated, harmonized data records, there are restrictions of the data that, in turn, limit the ability to match data over the registries and result in some uncertainty concerning the interpretation of variables that could influence the results.