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AA
(redirected from aortic arch)

    Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia, Hutchinson 0.07 sec.
AA
A grade assigned to a debt obligation by a rating agency to indicate a very strong capacity to pay interest and repay principal. Such a rating indicates only slightly lower quality than the top rating of AAA. Also called Aa.
AA
The second-highest bond rating by S&P and Fitch. AA is subdivided (in decreasing order) into AA+, AA, and AA-. Bonds with AA ratings are investment-grade, meaning that banks are allowed to hold them. AA bonds are low-risk and low-return. The rating is equivalent to an Aa rating by Moody's.


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Among specific topics are cannulation techniques for cardiopulmonary bypass, minimally invasive cardiac surgical coronary artery bypass grafting, repairing the myxomatous degenerated mitral valve, thoracic endovascular aortic repair for descending thoracic aortic and aortic arch aneurysms, pulsatile and axial ventricular support, and heart-lung transplantation.
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Improvements in surgical techniques and systemic perfusion strategies have reduced the mortality and morbidity for patients undergoing aortic arch replacement.
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Thrombi of the aortic arch are infrequent causes of systemic
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