A 74-year-old woman complains of painful and distended abdomen and nausea. She suffers from postinfarction and atherosclerotic cardiosclerosis and ischemic heart disease. Objectively, she is in a severe condition, her abdomen is distended, the abdominal wall is barely involved in the act of breathing. Laparoscopy detects a small amount of turbid exudate in the abdominal cavity, one of the small intestine loops is dark blue. Make the diagnosis: