my father died of a cardiac arrest. However, he had an abdominal aortic dissection that was detected on the last day. his intestines, gall bladder and part of the liver were removed. BP and pulse were high during the operation. later stabilised. then at 1.20 am, he had a cardiac arrest and passed away. He had no history of blood pressure, or heart disease.He first reported stomach, back n chest pain on 7th december, 2010. Also fainted and vomitted. However, doctors suspected food poisoning, colitus and later gall bladder inflammation. the actual problem was discover on 23rd Decemeber, he died later the same night.(24th december) I need to know how and why this happened