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The first description of a vascular ring (a double aortic arch) was by Hommel in 1737.
2) confirmed the presence of a vascular ring created by a double-sided aortic arch with compression of the trachea and oesophagus.
As the infection progresses, the tissue round the vascular ring degrades and develops a colourless rot with a paste-like consistency.
The diagnosis of a vascular ring can be made on the basis of characteristic findings on barium esophagography.
Esophagrams are useful to exclude a vascular ring by showing a normal contour of the posterior esophageal margin on lateral view, without a posterior impression.
Meanwhile, isolated vascular ring test indicated that TFY had an significant effect on vasomotion, and antagonize vasospasm; moreover TFY also could increase cerebral blood flow (CBF) and reduce cerebrovascular resistance index (RI) in normal rabbits, which verified the effect of TFY on vasomotion and abnormal hemorheology.