![]() ![]() ![]() In between are advancements that have revolutionized virtually every aspect of the way people live (safe water, no. 1) to the development of high-performance materials (no. The list covers a broad spectrum of human endeavor, from the vast networks of the electric grid (no. Reviewing the list, it’s clear that if any of its elements were removed our world would be a very different place-and a much less hospitable one. The result is a testament to the power and promise of engineering. The main criterion for selection was not technical "gee whiz," but how much an achievement improved people’s quality of life. This past February, working with the engineering professional societies, the NAE selected the 20 greatest engineering achievements of the twentieth century. Poised as we are between the twentieth and twenty-first centuries, it is the perfect moment to reflect on the accomplishments of engineers in the last century and ponder the challenges facing them in the next. ![]()
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![]() ![]() ![]() The SF-36 were used to assess the QoL at discharge (AD), the third postoperative month (POM3), and the twelfth postoperative month (POM12). Methodsĭata from 175 AAAD survivors was collected which were divided into two groups according to different surgical techniques: (group A): modified triple-branched stent graft implantation (group B): frozen elephant trunk. To compare the effects of modified triple-branched stent implantation and frozen elephant trunk technique on the quality of life (QoL) of acute Stanford Type A aortic dissection (AAAD) patients at different follow-up times. ![]() |
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