Acute haemorrhagic pancreatic necrosis. Pancreas affected by acute haemorrhagic pancreatic necrosis. Acute pancreatitis is a sudden inflammation of the pancreas. It can have severe complications and high mortality despite treatment. While mild cases are often successfully treated with conservative measures, such as NPO (nil per os, fasting) and aggressive intravenous fluid rehydration, severe cases may require admission to the intensive care unit or even surgery to deal with complications of the disease process. Acute haemorrhagic pancreatic necrosis, is characterised by acute inflammation and necrosis (tissue death) of pancreas parenchyma, focal enzymic necrosis of pancreatic fat and vessel necrosis (haemorrhage).