Severe hyperosmolar metabolic acidosis due to a large dose of intravenous lorazepam.

N Engl J Med, Vol. 346, No. 16 · April 18, 2002 · www.nejm.org · 1253 collateral vessels. Pathologic changes in the bowel that are associated with mesenteric venous thrombosis — especially bowel dilatation, bowel-wall thickening, reduced motility, and intestinal pneumatosis — can be assessed as readily by ultrasonography as by CT. After the diagnosis of mesenteric venous thrombosis, frequent monitoring should be conducted by ultrasonography in order to avoid radiation exposure or contrastinduced damage.1