Another vascular silent killer is an Abdominal Aortic Aneurysm (AAA). An aortic aneurysm is a ballooning of the artery that leads from the heart and courses through the chest and abdomen. This is a very large artery that carries a lot of blood feeding the lower half of the body. When an aneurysm bursts, it is fatal approximately 90% of the time. Since there are almost no symptoms with an AAA, most individuals with this problem have no clue they have it.