No. Our bodies obey the laws of physics, and one principle law is that fluid will follow the path of least resistance. Atherosclerotic plaques are calcified and hard and they create an obstruction that diverts the blood through alternate routes. During ECP, when your blood is flowing to your heart, it will naturally bypass arteries with plaque and enter healthy, non-diseased blood vessels to go around the blockages. Going around the blockages is a longer trip, but it is a much easier one. In time, these new pathways are reinforced and become lasting routes for blood to reach your heart beyond the blockages. Every ECP patient has had multiple, serious blockages. No one has ever had a heart attack or a stroke as a result of the treatment.