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.
Also, it can be used to assess intra-abdominal and retroperitoneal fat. CT criteria for the diagnosis of superior mesenteric artery syndrome include an aortomesenteric angle of less than 22 degrees and an aortomesenteric distance of less than 8-10 mm. In children, an angle of less than 20Â° has been correlated with superior mesenteric artery syndrome.