Since the arteries that feed the legs are narrowed by plaques, it causes an absence of blood flow, developing a problem called ischemia. Ischemia occurs when the demand from customers for oxygen is bigger than the supply. Bypass surgery. This surgery results in a new path for blood to flow https://www.sgvascularctr.com/treatment-of-peripheral-artery-disease-pad-in-singapore-a-comprehensive-guide/