Method: We used the database of the Health Insurance Review and Assessment Service (HIRA) in Korea. We employed the HIRA database from 2009 to 2013 to estimate the annual incidence, in-hospital mortality, related complications due to SJS and TEN. In this study, using the International Classification of Diseases-10th Revision (ICD-10), target study population was defined as patients with SJS or TEN, who had the primary diagnostic codes of L511 (SJS) or L512 (TEN), respectively.
Result: During four-years study period, estimates of annual incidence of SJS and TEN were 4.9-5.5 and 0.9-1.4 per million people. Mortality rate were 5.7% for SJS and 15.1% for TEN. Mean age was about 50 years old and female predominance was not so apparent in our data. Ocular and urethral sequelae were the most significant sequelae clinically that more than 40% of patients with both diseases suffered from ocular sequelae and about 6% of SJS and 9% of TEN patients were affected by the urethral sequelae. Mortality rate increased as the patients' age got older.
Conclusion: The incidence of SJS and TEN was not so much changed since 1990's. However, the mortality rate was decreased and this would be due to the evolution of supportive management.