A 74 y.o. female patient complains of pain, abdominal distension, nausea. She suffers from heart ichemia, post-infarction and atherosclerotic cardiosclerosis. On examination: grave condition, distended abdomen, abdominal wall fails to take active part in breathing. On laparoscopy: some cloudy effusion in abdominal cavity, one of the bowel loops is dark-blue. What is the most probable diagnosis?