Incidence and Mortality Rates of Thoracic Aortic Dissection in Korea - Inferred from the Nationwide Health Insurance Claims.

Background: Aortic dissection (AD) is one of the most catastrophic diseases and is associated with high morbidity and mortality. The aim of this study is to investigate the hospital incidence and mortality rates of thoracic AD in Korea using a nationwide database. Methods: We conducted a nationwide population-based study using the health claims data of the National Health Insurance Service in Korea. From 2005 to 2016, adult patients newly diagnosed with AD were included. All patients were divided into the following four subgroups by treatment: type A surgical repair (TASK), type B surgical repair (TBSR), thoracic endovascular aortic repair (TEVAR), and medical management (MM). The incidence rate, mortality rate, and risk factors of in-hospital mortality were evaluated. Results: In total, 18,565 patients were newly diagnosed with AD (TASK, n = 4,319 [23.3%]; TBSR, n = 186 [1.0%]; TEVAR, n = 697 [3.8%]; MM, n = 13,363 [72.0%]). The overall AD incidence rate was 3.76 per 100,000 person-years and exhibited a gradual increase during the study period (3.29 to 4.82, P< 0.001). The overall in-hospital mortality rate was 10.84% and remained consistent (P= 0.57). However, the in-hospital mortality rate decreased in the TASK subgroup (18.23 to 11.27%, P= 0.046). An older age, the female sex, hypertension, and chronic kidney disease were independent risk factors for in-hospital mortality. Conclusion: The incidence of thoracic AD has gradually increased in Korea. The in-hospital mortality in the TASR subgroup decreased over the decade, although the overall mortality of AD patients did not change.