Key Question 1: Are individuals with cardiovascular disease at an increased risk for a motor vehicle crash when compared to comparable individuals who do not have the disorder?

Key Question 2: What are the risk factors for rupture of an aortic (abdominal or thoracic) aneurysm?

Key Question 3: Is implantation of a pacemaker effective in preventing vasovagal syncope recurrence?

Key Question 4: What is the risk of sudden incapacitation or sudden death following implantation of an implantable cardiac device?

Key Question 5: What is the risk for sudden death or incapacitation in individuals with low left ventricular ejection fraction (LVEF) (<50%, <40%, <35%)?

Key Question 6: Is the relationship between LVEF and sudden death or incapacitation (if established) dependent upon the underlying etiology of heart failure?