Acute chest pain represents a common presentation at emergency department. Aortic dissection in young patients, however, is fortunately rare. We report a case of giant ascending aortic aneurysm with Stanford type A a...Acute chest pain represents a common presentation at emergency department. Aortic dissection in young patients, however, is fortunately rare. We report a case of giant ascending aortic aneurysm with Stanford type A aortic dissection in an otherwise well 22-year-old male patient. Operative aortic valve and root replacement was undertaken with favourable outcome. Histopathologic examination of the resected aorta revealed acute on chronic inflammatory change with Langerhans type giant cells consistent with a diagnosis of giant cell aortitis. While uncommon, emergencies of the aorta may present in young patients. Predisposing conditions are discussed.展开更多
The method of Laplace transforms is used to find the distribution function, mean, and variance of the number of renewals of a renewal process whose inter-arrival time distribution has a rational Laplace transform. Whe...The method of Laplace transforms is used to find the distribution function, mean, and variance of the number of renewals of a renewal process whose inter-arrival time distribution has a rational Laplace transform. Where the Laplace transform is not rational, we use the Padé approximation method. We apply our method to certain examples and the results are compared to those reported by other researchers.展开更多
文摘Acute chest pain represents a common presentation at emergency department. Aortic dissection in young patients, however, is fortunately rare. We report a case of giant ascending aortic aneurysm with Stanford type A aortic dissection in an otherwise well 22-year-old male patient. Operative aortic valve and root replacement was undertaken with favourable outcome. Histopathologic examination of the resected aorta revealed acute on chronic inflammatory change with Langerhans type giant cells consistent with a diagnosis of giant cell aortitis. While uncommon, emergencies of the aorta may present in young patients. Predisposing conditions are discussed.
文摘The method of Laplace transforms is used to find the distribution function, mean, and variance of the number of renewals of a renewal process whose inter-arrival time distribution has a rational Laplace transform. Where the Laplace transform is not rational, we use the Padé approximation method. We apply our method to certain examples and the results are compared to those reported by other researchers.
