“…" Strandness in 1969 (9) states that the gradient tension that develops in arterial stenosis blockages is the sum of the resistances of collateral circulation. "Those arteries distal to the area of occlusion have been termed the "run-@ C I C E d i z i o n i I n t e r n a z i o n a l i off" vessels and are considered the critical area in determining the immediate and long-term patency rate.…”