My husband had open heart surgery nine days ago. Blockage 100% in one 80% in another and 70% in the other. His aortic valve had to be replaced, After surgery he started bleeding and had to be reopened, but no bleeding found. Where did it come from? He was in Intensive care for five days and then got an infection, where did that come from? I get no answers. Urine culture negative. Sputum culture shows profuse growth Escherichia coli, Pseudomonas eriiegenosa . Stain showed many WBC seen, few epithelial cells, many gram negative rods, moderate gram positive cocci resembling Staphylococcus, moderate small gram positive bacilli few gram positive cocci resembling Stpahylococcus. I don t understand,