A 60 year old man is admitted to the intensive care unit with spontaneous bacterial peritonitis on a background of alcoholic liver disease. He is treated with appropriate antibiotics. However, following admission to the unit he continues to deteriorate and requires intubation. He becomes hypotensive requiring fluid resuscitation and vasopressor support, oliguric and requires high ventilatory pressures. Examination reveals decreased air entry bibasally, with a firm, distended and tense abdomen.