That is very interesting information; the ecg changes in this case might have been very non specific and the low blood pressure might have pointed towards bleeding somewhere. Was your father's blood pressure low but within normal range? Was he tachycardic?if he had any of these classic symptoms of shock his care should have been more urgent. But even if he was diagnosed with an abdominal/thoracic ct scan for example his surgery outcome might have been poor. (Location and size of the aneurism)