The Vista AVS makes the Ankle Brachial Index (ABI) and other arterial exams faster and easier to conduct, interpret and document. The exam is managed by an on-screen guide and hand-held controller. Currently, there are 8-12 million Americans affected by Peripheral Arterial Disease (P.A.D.) and the number grows each year. P.A.D. increases the risk of heart attack and/or stroke for those who have it. Many national health organizations encourage physicians to perform the Ankle Brachial Index (ABI) exam on their patients who are at risk.