You don t give either your husband s age,smoking history,medical history or medication history if any. All of these would be potentially relevant to the causology. Survival after the aneurysm actually ruptures,even if this occurred in hospital is very rare. I wonder if in fact it dissected,rather than ruptured. Aortic aneurysms are most common in male smokers over the gae of 65 years with raised blood pressure and raised cholesterol who are overweight and take little exercise.