In the small bowel, 30 to 40% of bleeding is caused by abnormal blood vessels in the wall of the small bowel. These abnormal blood vessels have many names, including angioectasias, angiodysplasias, or arteriovenous malformations (AVMs).he small bowel (or small intestine) is the longest portion of the gastrointestinal (GI) tract. It is called small because it is thin or narrow compared with the large bowel (also known as the colon), but it is much longer than the large bowel (14 feet on average).
Don't forget the multiple causes of an elevated d-dimer: 1  PE/DVT. 2  Sepsis/infection. 3  Malignancy. 4  Renal disease. 5  Pregnancy. 6  MI. 7  Stroke.
Causes Of Elevated BUN and Creatinine Levels: There are many causes of elevated BUN and Creatinine levels, including: 1  There may be a blockage of blood flow to or from the kidney.2  You may be dehydrated. 3  A urinary infection, or nephritis (inflammation of one or more of your kidneys). 4  Drug toxicity-risk for kidney problems may be from: 5  Chemotherapy drugs such as: Cisplatin, Carboplatin, ... 6  Bioloephrotoxicity can be temporary with a temporary elevation of lab values (BUN and/or creatinine). If these levels are elevated, these may be due to a temporary condition such as dehydration or you may be developing renal (kidney failure).