The left ventricle pumps blood through the aortic semilunar valve into the aorta. From the aorta, blood enters into systemic circulation throughout the body tissues until it returns to the heart via the vena cava and the cycle repeats.he left ventricle pumps blood through the aortic semilunar valve into the aorta. From the aorta, blood enters into systemic circulation throughout the body tissues until it returns to the heart via the vena cava and the cycle repeats.
The signs and symptoms of superior mesenteric artery syndrome vary but may include: 1  Feeling full quickly when eating. 2  Bloating after meals. 3  Burping (belching)  Nausea and vomiting of partially digested food or bile-like 1  liquid. Small bowel obstruction.  Weight loss.
From Wikipedia, the free encyclopedia. Superior mesenteric artery (SMA) syndrome is a rare, potentially life-threatening gastro-vascular disorder characterized by a compression of the third and final portion of the duodenum by the abdominal aorta (AA) and the overlying superior mesenteric artery.he syndrome is typically caused by an angle of 6Â°-25Â° between the AA and the SMA, in comparison to the normal range of 38Â°-56Â°, due to a lack of retroperitoneal and visceral fat (mesenteric fat). In addition, the aortomesenteric distance is 2-8 millimeters, as opposed to the typical 10-20.