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.
Ascending Aorta - initial part of the aorta that begins from the aortic valve and extends from the left ventricle of the heart to the aortic arch. Coronary Arteries - arteries branching from the ascending aorta to supply oxygenated blood to the heart wall.
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.