The authors analyse 16 cases of acute ischemia observed over a period of one month after an operation of general surgery. The classical cardiac origin, e.g. infarct, arrythmia, was found in only three patients. The septic etiology was predominant, septic arterial emboli but not infective or acute thrombosis during septic or post-operative shock. The clinical aspect showed no special characteristics. Surgery remains the principal form of treatment. The results are good, except in acute arterial thrombosis justifying plastic surgery which may give better results than simple thrombectomy.