Introduction
SVG remains the most commonly used bypass conduit in CABG because it is usually available at desired length, easily harvested without being time-consuming, technically easy to use due to its wall characteristics and large diameter, supplies a limitless blood flow to the myocardium, and associated with less risk of sternal wound infection[1] .
OVH is associated with long incisions and consequent associated pain and other complications [2] .OVH harvesting includes leg wound complications, prolonged convalescence and poor cosmetic results resulting in patient dissatisfaction. It may prolong a hospital stay or require readmission for debridement, or IV antibiotics. EVH is a less invasive with (2%-5%) morbidity. EVH reduces postoperative pain, the incidence of wound complications and length of hospital stay. EVH also eliminates the need for long leg incisions and increases patient satisfaction [3] . Patients undergoing CABG experience wound complications (3%-30%) related to OVH technique. It requires an extended incision and the associated complications often prove troublesome in the recuperative phase of CABG [4] .
Since 1996, the first clinical report of EVH was published; it has increased in popularity to become the preferred method of SVG harvesting technique [5] . EVH is an atraumatic procedure that harvests SVG without direct manipulation of the vein. It is beneficial in reducing leg wound complications, postoperative pain and morbidity compared with OVH technique [6] . EVH is usually done from the thigh but this conduit usually short length. The endoscope could be negotiated through the same entry wound at knee level to harvest an additional length from the leg without conversion to open. The use of EVH method reduces the invasiveness of OVH method and its morbidity[4] .