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AA
(redirected from aortic arch)

    Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia, Hutchinson 0.02 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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The mass encircled the aortic arch and pulmonary artery and extended to the cardiac base.
Unusual paratracheal masses presenting with vocal fold paralysis by Powers, Celeste N. / Ear, Nose and Throat Journal
pdf)], relatively weak CYP1A immunofluorescence was observed predominantly in vessels most proximal to the heart, including the first aortic arch and the carotid artery (Figure 1D,G).
Aryl hydrocarbon receptor-independent toxicity of weathered crude oil ... by Scholz, Nathaniel L. / Environmental Health Perspectives
Immediate surgical intervention was performed by implantation of an aortic arch (St.
Prosthetic valve endocarditis due to Kytococcus schroeteri by von Eiff, Christof / Emerging Infectious Diseases
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