Abstract 9976: Contrasting Mortality Trends of Aortic Emergency: Dissection and Rupture in the UK, Japan, USA, and Canada

Introduction: Aortic dissection and aneurysm rupture are aortic emergencies. Surgical outcomes and interventional procedures have improved over the past two decades; however, whether this has translated into lower mortality across countries remains an open question. Hypothesis: We hypothesized that given improved surgical mortality, there will be improvement in mortality from aortic dissection and rupture in the UK, Japan, USA, and Canada. Methods: We analyzed the WHO mortality database to determine trends in mortality from aortic dissection and rupture in 4 countries from 2000 to 2019. Crude mortality rate and age-standardized mortality rate per 100,000 persons were calculated, and annual percentage change was estimated using joinpoint regression. Results: In 2019, crude and age-standardized mortality rates from aortic dissection were 2.15 and 1.04 in UK, 8.67 and 2.66 in Japan, 1.21 and 0.76 in USA, and 1.30 and 0.67 in Canada, respectively. In 2019, crude and age-standardized mortality rates from aortic rupture were 4.86 and 1.80 in UK, 5.22 and 1.16 in Japan, 1.04 and 0.52 in USA, and 1.99 and 0.81 in Canada, respectively. There was a significantly decreasing trend in age-standardized mortality from aortic aneurysm rupture in all 4 countries over the study period, and a decreasing trend in age-standardized mortality from aortic dissection in the UK over the study period, in USA until 2010, and in Canada until 2012. There was a significantly increasing trend in mortality from aortic dissection in Japan over the study period, in the USA after 2010, and in Canada after 2012. Joinpoint regression identified significant changes in the trends from decreasing to increasing in USA and Canada. In sensitivity analyses stratified by sex, similar trends were observed. Conclusions: Trends in mortality from aortic aneurysm rupture are decreasing, however, mortality from aortic dissection is increasing in Japan, USA, and Canada. Further study to explain these trends is warranted.