Thiamine Overdose. Overdosing on thiamine, or vitamin B-1, is rare but can cause severe symptoms. Mild symptoms of an overdose include weakness and a headache, the American Pregnancy Association reports. In some cases, high vitamin B-1 levels can cause a rapid, irregular heart beat and low blood pressure.
Descending Aorta - major portion of the aorta that extends from the aortic arch to the trunk of the body. It forms the thoracic aorta and abdominal aorta. Thoracic Aorta (Chest Region): Visceral Branches - supply blood to the lungs, pericardium, lymph nodes, and esophagus.
Medical Definition of AORTA. : the large arterial trunk that carries blood from the heart to be distributed by branch arteries through the body. the great arterial trunk that carries blood from the heart to be distributed by branch arteries through the body â see heart illustration. â aorÂ·tic \-ËoÌr-tik\ adjective. See aorta defined for English-language learners.