I work in a Peds CVICU, we had one patient about a year ago who was 23 y/o and post-op conduit replacement. For about 3 days she kept telling her nurses she saw the angel of death standing in the corner, she would even talk to him sometimes. Everyday she told us she was going to die but clinically she looked great! We chalked it up to ICU psychosis, but one night she coughed and her chest literally split open. Turned out there was an infection brewing that was slowly eating away at her new conduit and her sternum. When she coughed it split and she died pretty instantly. After that we had a string of patients who ended up dying in that one room... still creeps me out!