Regarding mesenteric arterial thrombosis or embolism: "..early symptoms are present and are relative mild in 50% of cases for three to four days before medical attention is sought" [REF].
Regarding nonocclusive intestinal ischemia: "Any patient who takes digitalis and diuretics and who complains of abdominal pain must be considered to have nonocclusive ischemia until proved otherwise" [REF].