The AA report on 12 cases of intestinal infarction for acute mesenteric ischemia (IMA) in critical patients observed in the last 2 years. In this work some clinical data, blood tests and strumental considerations are described. IMA is a vascular emergency with severe prognosis and high rate morbidity and mortality, often correlated to a diagnostic delay. The discrepancy between symptoms and clinical objectivity must suggest the suspect, especially in patients with cardiac pathology, short lasting diarrhoea, bowel hemorrhage or only abdominal pain rebel to the analgesics; with the laboratory indexes and strumental data it can be carried out an early diagnosis and then begin the more opportune therapeutical treatment. The increase of blood sugar together to the triad leucocytosis--haemoconcentration and metabolic acidosis, in previously non diabetic patients, confirm the suspect of IMA in the very initial phases of this pathology.